october 1974 75 cents [pp a harcourt brae jovanovich … · imp 0. electronic technician/dealer...

IMP0. ELECTRONIC

TECHNICIAN/DEALER

OCTOBER 1974 75 CENTS [PP A HARCOURT BRAE JOVANOVICH PUBLICATION

WORLD'S LARGEST TV -RADIO SERVICE & SALES CIRCULATION

A RealisticApproach To TVTuner Troubles

Precision Tuner Service /Ilk. now available near you

ALABAMA: CALIFORNIA-NORTH: CALIFORNIA-SOUTH: COLORA00: FLORIDA-NORTH: FLORIDA-SOUTH: HOME OFFICE-INDIANA:524 32ND STREET SOUTH 4611 AUBURN BLVD. 5111 UNIVERSITY AVE. 1958 ALLISON ST :918 BLANDING BLVD 12934 NW 7th AVE 5233 S HWY. 31BIRMINGHAM. ALA. 35222 SACRAMENTO. CALIF. 95841 SAN DIEGO, CALIF 9210' ARVADA. COLO. 80001 JACKSONVILLE, FLA. 32210 MIAMI. FLA. 33168 BLOOMINGTON. IND. 47401TEL. 205, 323.2657 TEL 916, 482.6220 TEL 714, 280.7070 TEL. 303, 423.7080 1EL. 904, 3891952 TEL 305. 685 9811 1EL. 812. 824 9331

TEXAS-EAST:432416 TELEPHONE RDHOUSTON, TEX. 77032TEL. 713, 6446793

TEXAS-NORTH:MOPAC LANELONGVIEW. TEX. 75601TEL 214, 753.4334

TENNESSEE:3614 LAMAR AVEMEMPHIS, TN. 38118TE1. 901, 365.1918

PENNSYLVANIA-WEST:257 RIVERVIEW AVE. W.PITTSBURGH, PA. 15202'FI 412, 761 7648

PENNSYLVANIA-EAST:1921 S 70th STPHILADELPHIA, PA. 19142TEL. 215, 724-0999

OREGON:5220 N E SANDY BLVD.PORTLAND, OREGON 97213TEL. 503, 2829636

... new pts products ... stop ... new 1974-1975 tuner replacement guide andparts catalog no. 4 ... stop ... 96 pagesof top tuner information ... stop .... blow-ups of all types of vhf and uhf

tuners for easy parts identification ...... stop ... largest exact tuner replace-ment guide available in the industry... stop ... antenna coil replacement

guide ... stop ... multifit replacementtuner shaft guide ... stop ...

... available for $2.00 ... stop ..... redeemable with min.

order ... stop ...pts elex .

OKLAHOMA:3007 N MAYOKLAHOMA CITY. OKLA. 73106TEL. 405, 947-2013

OHIO-SOUTH:US TUNER SERVICE8180 VINE STCINCINNATI, OHIO 45215TEL 513, 821.2298

OHIO-NORTH5682 STATE RD.

CLEVELAND, OHIO 44134TEL 216, 845 4480

asanc,41*;

KANSAS:3116 MERRIAM LNEKANSAS CITY, KANSAS 66100TEL 913, 8311222

LOUISIANA:2914 WYTCHWOOD DR.

METAIRIE, LOUISIANA 70033TEL. 504, 885.2349

MARYLAND:1105 SPRING ST.SILVER SPRING. MD. 20910TEL. 301, 565-0025

MASSACHUSETTS:191 CHESTNUT STSPRINGFIELD. MASS. 01103TEL 413, 734.2737

MICHIGAN:13709 WEST 8 MILE RDDETROIT, MI. 48235TEL 313, 862 1783

MINNESOTA:815 WEST LAKE ST.MINNEAPOLIS. MINN. 55408TEL 612, 824.2333

NORTH CAROLINA: N.Y. CITY-NEW JERSEY: NEW YORK MISSOURI:724 SIEGLE AVE 158 MARKET ST 993 SYCAMORE ST. 8456 PAGE BLVD.CHARLOTTE, N.C. 28205 E PATERSON. N J. 07407 BUFFALO. N.Y. 14212 ST LOUIS. MO. 63135TEL 704, 3328007 TEL 201, 791 6380 TEL 716, 891.4935 TEL. 314, 428.1299

LET US TAKE CARE OF YOUR TUNER PROBLEMS...PTS will repair any tuner-no matter how old or new -black & white or color-transistor or tubes--varactor or electronically tuned-detent UHF. 8 hour service is a must!

ff'

Tad 8 hr. Service!

We offer you finer, faster.

PrecisionTuner Service

...THIS IS THE SERVICE WE OFFER:1 Fastest Service -8 hour in and out the same day. Overnight transit to one of our

strategically located plants.2. Best Quality-Your customers are satisfied and you are not bothered with returning

tuners for rework.3. PTS uses only ORIGINAL PARTS! No homemade or make -do, inferior merchandise (this

is why we charge for major parts!). You get your tuner back in ORIGINAL EQUIPMENTcondition.

4. PTS is recommended by more TV Manufacturers than any other tuner company.5. PTS is overhauling more tuners than all other tuner services combined.

1 YEAR GUARANTEE

ELECTRONICS, INC.......Number ONE and still trying harder!

(Not a Franchise Company)

VHF, UHF $10.95UV -COMBO 172.95

IF-SUBCHASSIS 1.50Major parts and shipping

charged at cost.(Dealer net!)

Over 4000 exact tuner replace-ments available for $14.95 up

(new or rebuilt)

. . . for more details circle 124 on Reader Service Card

Now you don't have to turn down jobsjust because the sets

were made in the Far East.

Your Sylvania Distributor hassolved one of your biggest problemsin semiconductor replacements forimported equipment.

Until now, unless your shop wasaround the corner from an importwarehouse, you probably had a toughproblem. Especially for those non -repairable modules.

But not anymore.Sylvania's new ECGTM 1000 series

gives you over 140 new integratedcircuits and modules for imported setsright on your distributor's shelves.

And, thanks to our newest inter-changeability guide (ECG 212E-4),those 140 parts add up to a lot more

GTE Sylvania, Electronic Components Group,100 First Avenue, Waltham, MA. 02154

when it comes to the number of typesthey'll replace.

That means you don't have to watcha profitable repair job walk out the doorjust because getting the parts couldmake it unprofitable.

It also means that you've got one -stop shopping for all of your repairjobs, foreign or domestic.

Whether you need semiconductors,picture tubes or receiving tubes, you'llfind them all at one electronicsupermarket.

Your Sylvania Distributor.

(9-i-4 SYLVAN IA

OCTOBER 1974, ELECTRONIC TECHNICIAN/DEALER I 1

J. W. PHIPPSEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511

ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 572-4839

TOM GRENEYPublishing Director

JOSEPH ZAUHARManaging Editor

BERNICE GEISERTProduction Manager

JOHN PASZAKGraphic Design

LILLIE PEARSONCirculation Fulfillment

GENE BAILEYManager, Reader Services

MANAGERS

DAVE HAGELIN43 East Ohio StreetChicago, Ill. 60611(312) 467-0670

CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678

KEN JORDANDONALD D. HOUSTON1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530

CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794

ROBERT UPTONTokyo, JapanC.P.O., Box 1717

ELECTRONICTECHNICIAN/DEALEROCTOBER 1974 VOLUME 96 NUMBER 10

FEATURES

20 A REALISTIC APPROACH TO TV TUNER TROUBLES

Proper cleaning and lubrication techniques, use of a TV tuner substitution unit tolocalize problems to the tuner, and limiting the amount of time you spend trouble-shooting a tuner before turning it over to a tuner specialist can increase your profitsfrom TV tuner servicing. By Al Friedman, President, Chemtronics, Inc.

24 NEW IN COLOR TV FOR '75-Part 2

Second of a three-part series which acquaints ET/D readers with the features andnew or significantly changed technology in the recently introduced 1975 line of colorTV receivers. Part 1 provided a general overview of the features, models and chassiscomplement of each manufacturer's new line. In Part 2, new and significantlychanged circuits are analyzed. By the ET/D editorial staff.

32 BALANCING CHANNELS IN MATV SYSTEMS

Why the levels of signals of all TV channels received and distributed by an MATVsystem should be equalized, and how it can be accomplished. By James E. Kluge,Technical Editor, Winegard Company.

36 ELECTRONIC SECURITY SYSTEMS-A Natural for ElectronicServicers and Dealers

"Total packaged systems" and the increased availability of sales and installationliterature are making it easier and more profitable for electronic servicers and deal-ers to expand into this growing consumer market. By Charles Eisenhardt, Vice Presi-dent, PLC Electronics Inc.

40 TEST INSTRUMENT REPORT-Measuring DC Beta with the HeathkitModel IT -121 FET/Transistor Tester

What Beta reveals about the operational capability of bipolar transistors, and howit is measured with the Model IT -121. By 1 W. Phipps.

TEKFAX-Airline Model GEN11965A; General Electric Ch. QB; Quasar Ch. 17 -TS -941,C19, E19, 19TS-941; Sylvania Ch. Al2.3, -4, 5; and Zenith Ch. 17FC35.

DEPARTMENTS

6 NEWS OF THE INDUSTRY 48 NEW PRODUCTS

8 ELECTRONIC ASSOCIATION DIGEST 53 DEALER SHOWCASE

10 READERS' AID 58 ADVERTISERS' INDEX

12 TECHNICAL DIGEST 59 READER SERVICE

44 TECHNICAL LITERATURE

01 A HARCOURT BRACE JOVANOVICH PUBLICATION Tar (n).

HARCOURT BRACE JOVANOVICH PUBLICATIONS: lames Milholland, Jr., Chairman; Robert L. Edgell,President; Lars Fladmark, Senior Vice President; Richard Moeller, Treasurer; John G. Reynolds,Vice President; Thomas Greney, Vice President; Ezra Pincus, Vice President; Bruce B. Howat, VicePresident; James Gherna, Vice President.

ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications.Corporate Offices: 757 Third Avenue, New York, New York 10017. Advertising Offices: 43 EastOhio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial,Accounting, Ad Production and Circulation Offices: 1 East First Street Duluth, Minnesota 55802.Subscription rates: One year $6, two years $10, three years $13, in the United States and Canada.Other countries: one year $15, two years $24, three years $30. Single copies: 756 in the U.S.and Canada; all other countries $2. Second class postage paid at Duluth, Minnesota 55806 andat additional mailing offices. Copyright (c.) 1974 by Harcourt Brace Jovanovich, Inc. All rightsreserved. No part of this publication may be reproduced or transmitted in any form or by anymeans, electronic or mechanical, including photocopy, recording, or any information storage andretrieval system, without permission in writing from the publisher.POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth,Minnesota 55806.

2 ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

THE 3 -letter word for television antenna systems:

JFD

OUTDOOR TELEVISION ANTENNAS

INDOOR TELEVISION ANTENNAS

TELEVISION ACCESSORIES

JFD is the way more dealers, installers, and distributors are spellingtelevision antennas these days.For good reason.

OUTDOOR TV ANTENNASThey know that JFD antennas assure best possible performance-in color and black-and-white-on allchannels (2 to 83). Because only JFD combines the super -sensitive log periodic concept withcapacitor coupled dipole design. All of the elements (not just some as in other antennas) work together forlaser sharp picture brilliance.And you can select from a complete line of models to suit every reception (and budget) need.

INDOOR TV ANTENNASYou can also look to JFD for the broadest selection of indoor antennas: Too -of -the -set, behind -the -set,in -the -set, O.E.M. . . . we got them. Made right, packaged right, priced right.

o TV ACCESSORIESTo del ver picture -perfect reception to the set, team up your JFD antenna w th any of the many JFDaccessories: amplifiers, splitters, couplers, transformers, moi.nts, masts, standoffs, hardware or wire-for superior results.

THE LINE OF PROFIT -ABILITYOnly J-71) can hand you a line like this-the !ine of proved performance and profit -ability.Take cur word for it. 0

The Best Reception Starts with A JFD Antenna.9ffJFD

JFD ELECTRONICS CORPORATIONA RIKER-MAXSON SUBSIDIARY

1462 62 STREET, BROOKLYN, NEW YORK 11219JFD INTERNATIONAL, 2200 SHAMES DRIVE, WESTBURY, N.Y. 11590/JFD CANACA LTD., ONTARIO, CANADA

212/256-9000... for more retails circle 118 on Realer Service Card

RCSsflee&

Dealer Awardsncn Electronic

Components

Toastmaster Plug-in AutomaticTimer for Lamps and AppliancesCordless timer plugs directly into outlet. Timecycle extends from 90 minutes to 221/2 hours.Turns lamps and appliances on or oil anytime of day or night and repeats the operationevery 24 hours without resetting.FE -630

Harrison, New Jersey 07029

Polaroid Colorpack 5 Land Cameraand Kit. Enjoy Instant Photographyin Color and Black and White Big 3'/4 x 41/4 color pictures in one minute Blackand white pictures in seconds 3 -element lens andunique face -in -the -square viewfinder

FE -687 Value: $44.95

Schick Styling Driers, Man's & Lady's ModelsFor Women: Quick drying with more natural stylingFor Men: Dries fast while it styles and grooms 2 Speeds, 2 Heats Dry setting - high airflow and high heat Stylesetting - low airflow and low heat Professional styling brush and stylingcomb Air concentrator nozzleMan's FE -336 Lady's FE -338 Value: $15.98


Canon Palmtronic LE -83 CalculatorSlender enough to put in your pocket, the CanonPalmtronic LE -83 combines convenience with preci-sion. Adds, subtracts, multiplies, divides, performsmixed calculations, calculations with a constant andn-th power calculations. Comes with an AC adapteror can be used with 4 penlight batteries. Smoothkey touch, easy to read LED indication panel.FE -LE -83 Value: $44.95

Spalding "Rebel" Golf Balls(One Dozen)Spalding is the premier distance ballwith indestructible Surlyn cover. Two-piece construction gives you extrayards for the power you pack into yourdrive FE -11117 Value: $14.90

Spalding "Collegiate" FootballThe best value you'll find in a full -grain leather football. Tough butylrubber bladder. Triple fabric liningwith lockstitch construction.FE -61448 Value: $17.00

When you buy RCA tubes from your participating RCA tube dis-tributor, he delivers the goods the easy way. No muss, no fOss,no constant cutting of carton flaps, no torn cartons on your shelfor in your caddy. Just give your tube order to your RCA distributorand get your premium the free and easy way. The bigge- yourtube order, the more valuable your gift. So visit him soon andselect your Free and Easy RCA award with your purchase of RCAtubes. (The values are really extra special.)

No Muss No Fuss No Torn Tube Cartons.Visit Your Participating RCA Tube Distributor.Place Your RCA Tube Orderand Select Your "Free and Easy" RCA Award!

Remember, the Award Values Are Extra Special!

Omaha Steaks Ten RCA "Steak -out '74" certifi-cates can be redeemed for one package of tender,succulent Omaha steaks as follows:6 (11 oz.) Boneless Strip Sirloins 1'/e" thick or8 ( 6 oz.) Filet Mignons 11/4" thick or8 ( 8 oz.) Top Sirloins 11/4" thick or6 ( 8 oz.) Filets of Prime Rib 1" thickChoice cuts, generous portions and outstandingflavor! 1A2116

Compass BinocularsPerfect for use at tne track, at the stadium, in thewoods. Field of view is a large 367 Feet at 1000yards. Hard -coated optics. Complete with caseand strap.FE -3022 Value: $44.95

BULOVA ...The watch you wear with pride. Bulova... synonymous with quality, craftsman-ship, precision and style.Oceanographer- Highly contemporary 17 jewel, Sea Kirg - Stalwart Bulova Sea King, 17 jewelautomatic instant change day/date calendar: precision timepiece, water-resistant with luminousdepth tested to 333 feet. FE -12604 Value: $110 dial. FE -12280 Value: $65La Petite- Stunning feminine timepiece with 23 Concerto- Prettily sculptured model with 17 jew-jewels, 4 diamonds, 10K rolled gold plate case els. 10K rolled gold plate, stainless steel back andAdjustable mesh bracelet. FE -55775 Value: $110 silver dial. FE -63628 Value: 565

Shakespeare Deluxe SpinningCombo Balanced Tackle SetShakespeare #2210 Marina Green spinning reel,matching Shakespeare SP -160 6' 6" Wonderod,200 yards 6-pouno monofilament, box of stainlesssteel hooks and spinning lure. For fresh and lightsalt -water fishing. FE -S460 Value: 542.00

Spalding Pancho Gonzales"Pro Champ" Tennis SetPancho Gonzales "Pro Champ" racket, water-proof racket cover, plus three Pancho Gonzalestennis ballsFE -531063 Value: $18.65

OCTOBER 1974, ELECTRONIC TECHNICIAN/DEALER 15

NEWS OF THE INDUSTRY

RCA, Westinghouse Increase Replacement Color Picture Tube Prices

Price increases averaging about 7.5 percent have been announced by RCA for its all -new and rebuilt replacement color TV picture tubes. The price increases, which becameeffective September 16, average $5.00-$6.00 per tube.

Westinghouse also has increased the prices of its replacement color TV picture tubeline an average of $5.00-$6.00 per tube. Westinghouse's price increase became effectiveAugust 6.

Rising costs of labor and materials are cited as the reasons for the increases.

Color TV Sales to Dealers Down 5.2% in First Seven Months of '74

The Electronic Industries Association's (EIA) Marketing Services Department hasreleased statistics which reveal that color TV sales to dealers during the first sevenmonths of 1974 were 5.2 percent below sales during the same period last year. Theseand other EIA-compiled statistics about sales to dealers of other consumer electronicproducts during the first seven months of 1974 are shown below:

UNIT SALES TO DEALERSJanuary -July 1974 Vs. Same Period in 1973

(Source: EIA Marketing Services Dept.)

TELEVISION 1974 1973 % CHANGEMonochrome 3,190,449 3,558,981 -10.4Color 4,337,656 4,574,940 - 5.2TOTAL TELEVISION 7,528,105 8,133,921 - 7.5

RADIO

AM 5,835,678 8,268,866 -29.4FM 9,381,961 8,656,090 + 8.4TOTAL 15,217,639 16,924,956 -10.1AUTOMOBILE 5,650,633 7,410,262 -23.8TOTAL RADIO 20,868,272 24,335,218 -14.3

PHONOGRAPH

Portable & Table* 1,780,576 2,677,699 -33.5Console 407,678 428,319 - 4.8TOTAL PHONOGRAPH 2,188.254 3,106,018 -29.6

*Includes compact and component systems.

Zenith Increases Color TV Suggested Retail Prices 10 Dollars

Zenith has upped the suggested retail prices of all models of its present color TVline by $10.00. The price increase, which went into effect September 1, might be fol-lowed by further increases during coming months, according to Walter C. Fisher,Zenith executive vice president of sales and marketing.

Price increases of $10-$20 also have been announced by Zenith for its AllegroTMseries of audio products, along with increases of $25 to $30 for seven models of itsconsole stereo and four -channel audio products.

PTS Opens New Tuner Service Center in Miami

PTS Electronics, Inc., Indiana -based tuner repair company, recently opened a newTV tuner repair center at 12934 NW 7th Avenue, Miami, Florida.

New Minimum Wage Laws Ease Restrictions on Employment ofFull -Time Students

Restrictions are eased on the hiring of full-time students at subminimum wages forpart-time and summer jobs as a result of the Fair Labor Standards Act (FLSA) amend-ments which went into effect May 1 of this year.

Secretary of Labor Peter J. Brennan has announced that retail and service employersmay now employ up to four full-time students at 85 percent of the minimum wage byfiling an application with the Secretary of Labor.


Employers seeking to hire more than four students must still receive prior certifica-tion from the Secretary. This is to ensure that student employees do not displace regularfull-time workers.

Employers may pay student learners working in bona fide vocational education pro-grams 75 percent of the minimum wage, upon filing proper application with the Sec-retary.

In all cases, student employment must be in compliance with applicable child laborlaws.

Persons needing further information should contact the nearest Employment Stan-dards Administration Wage -Hour Office, listed in most phone books under U.S. Govern-ment, Department of Labor.

Independents Honoring Bank Credit Cards Faring Better ThanThose Who Do Not Says NFIB Data

Data compiled from 16,000 respondents to a field survey conducted in April by theNational Federation of Independent Business (NFIB) indicates that in the current in-

flationary period, which has resulted in high interest rates and an increase in defaultingcreditors, independent business firms honoring bank credit cards appear to be faring alittle better than those who do not.

According to the NFIB, this might be due to the fact that those who turn their creditproblems over to the banks eliminate the need for borrowing at high interest rates tocarry accounts, and, at the same time, reduce their costs of billing and escape creditlosses, which seemingly are mounting.

Of the entire sample in April, 21.2 percent report a higher profit, 23.2 percent thesame profit level, and 44 percent a lower profit level. But of those who accept bankcredit cards, 23.1 percent report a higher profit, 25.5 percent the same level, and 37.2percent a lower profit.

Of the entire sample, 24.7 percent report a drop in dollar volume, while of thoseaccepting credit cards, 23.4 percent report a dollar volume drop.

There also appears to be a more optimistic attitude toward future business conditionsamong retailers who honor credit cards than among those who do not. Of those accept-ing cards, 47 percent anticipate improved conditions, as compared to the 39.2 percentwho do not honor bank credit cards, and only 9.5 percent of the card -honoring firmsanticipate a worsening condition, as compared to 12.8 percent of those who do not honorcards. The two groups are evenly matched as to anticipations of conditions remainingthe same.

Superscope Opens New Service Center in Minnesota

The opening of a new company -owned and operated service center in Burnsville,Minnesota, recently was announced by Superscope.

Superscope-which markets audio components and music systems under the Marantz,Superscope and Sony Superscope brand names-also has "full -service" centers in

Chicago, Detroit, Boston, New York and Seattle.The address of the new Superscope service center is: 12004 12th Ave. South, Burns-

ville, Minn. 55337.

University Sound Opens Midwest Warranty Repair Center

University Sound, Altec Sound Products Division, recently announcedthe appoint-ment of Electronic Engineers, 1639 W. Evergreen, Chicago, as the midwest center forwarranty repair of its electronic and musical sound products.

Weltron Acquired by LCA Corp.

The Weltron Company, Inc., manufacturer of home entertainment electronicproducts,has been purchased by LCA Corporation, a manufacturer of housewares, home fur-nishings and lighting products.

RCA Increases Prices of Mobile Communications Products

RCA Mobile Communications Systems increased the prices of its line of two-wayradio communications equipment an average of 7 percent, effective September 15.


DID YOU KNOWHOT DIP GALVANIZINGCOSTS $ 0.20 ',:rund ?

No. 25G TowerSection weights40#x 21:X =$8.00

Mfg. Cost

ROHN'sNo. 20G TowerSection weights30# x 21:X =$6.00

Mfg. Cost

If you arepurchasingtowers whichare not HOT DIPGALVANIZEDyour cost shouldbe at least $8.00or $6.00 less.

RCIHN®MANUFACTURINGDIVISION OF C/AtifRCL)10

wastR,

P 0 BOX 2000 / PEORIA, ILL 61601

"Supplying tower needs worldwidefor over 25 years."

ELECTRONICASSOCIATION DIGESTInformation about the activities of national, state and local associa-tions of electronic servicers. dealers and manufacturers. Materialfor publication in this department should be addressed to: ServiceAssociation Digest. ET D, 1 East First St., Duluth. Minn. 55802.

ISCET Technical LibraryThe International Society of Certified Electronic Tech-

nicians (ISCET) has established a technical library inKansas City, Missouri.

The library, called ISCET TECH (Technical ElectronicClearing House), presently is being stocked with serviceliterature for all types of old and contemporary electronicequipment.

Technicians who have service literature they would liketo donate to the library or who are in need of serviceliterature for an older model of electronic equipment areinvited to contact the supervisor of the library, HenryGolden, CET, 8015 Paseo, Kansas City, Missouri 64131.

Indiana Attorney General Rules That TV LicenseBoard Has Authority to Regulate CATVInstallers & Technicians

The Attorney General of Indiana, in response to a re-quest from the Indiana Board of Television and RadioService Examiners, has issued an official opinion that theBoard has statutory authority to regulate CATV installersand technicians in that state.

Following this ruling, the Board of Television and RadioService Examiners held a fact-finding meeting on June 12,to consider the licensing of CATV installers and techni-cians. Attending this meeting were representatives of theCATV industry in Indiana and the Indiana Electronic Ser-vice Association (IESA).

The IESA representative, Edward T. Carroll, CET, In-dianapolis, told the Board that IESA favors the licensingof CATV installers and technicians.

The Board presently regulates electronic service businessestablishments and licenses TV and radio electronic tech-nicians and installers of home antenna installations.

Illinois Association Changes Name, RequiresMembership on Company Instead of Individual Basis

1 he Illinois Diversified Electronics Association, in aquarterly meeting in July, changed its name to The Na-tional Electronics Service Dealers Association of Illinoisand adopted a new charter which requires that member-ship be on a company basis instead of individually.

The name of the Association was changed so that mem-bers could "more closely align" themselves "with the na-tional association (NESDA) and to give quicker recogni-tion to members wherever they may go in the country."

Indiana Association Elects New OfficersThe Indiana Electronic Service Association (IESA), at

a meeting on June 9, installed the following new officers:Elbert Powers, CET, president; Dean Moch, CET, Region1 vice president; Harry L. Robbins, CET, Region 2 vicepresident; James Candler, Region 3 vice president; WilmerLundy, CET, Region 4 vice president; James Smith, Jr.,CET, Region 5 vice president; Robert Smith, CET, Region6 vice president; Claude Desmeules, CET, treasurer; andEdward Paquette, director at large. MI

... for more details circle 126 on Reader Service Card

ELECTRONIC TECHNICIAN DEALER, OCTOBER 1974

1%1the price for

moving up to asweep/function

generatorjust came down

to $149.50

WE ACCEPT:

master chargeTHE INTERBANK CARD

BANKAMERICARD

timleomekle

Exact now offers a laboratory -qualitysweep/function generator at a price you'dpay for less -useful sine -square oscillators.And you'll get so much more out of thenew Model 195 than traditional audio testequipment, such as sine, square, triangleand swept waveforms ... even pulses.

This new 2 Hz to 200 kHz instrument isthe practical answer to many of yoursignal source needs, whether you'rechecling audio equipment, testing bread-boarded circuits or teaching at the highschool or college level.

An internal sweep generator lets yousweeo, either linearly or logarithmically,the Entire audio range of amplifiers orspeakers without changing ranges or eventouching a knob. The Model 195 has three1000:1 sweep ranges for frequencysweeping plus high and low level sineoutputs with amplitude control. Or youcan control the frequency by an externalvoltage (VCF).

The Model 195 is completely portable,operated by a 9 -volt transistor battery, soyou can forget 60 -Hertz hum problemsaltogether. An optional rechargeablepower supply and charger permits con-tinuous operation from Ni-Cad batterypower.

This is a true instrument ... developed byby one of the world's leading designersand manufacturers of laboratory functiongenerators and frequency synthesizers.Find out what the Model 195 can do onyour bench, and move up to a bettersource of signals.

Price: Model 195 $149.50Opt onal rechargeable power supply,complete with battery and charger $25.00f.o.b. Hillsboro. Oregon. Instrumentsstocked in 36 locations across the UnitedStates.

n EXACTelectronics, inc.

(A subsidiary of Danalab, Inc.)BOX 160, HILLSBORO, OREGON 97123

(503) 648-6661 TWX 910-460-8811In Europe, Africa and the Middle East, contactDarvalab International S.A. 119/121, Rue Anatole

Telex: 846-23662France 1030. Brussels, Belgium, Tel: 2414550.

POWER RANGE -HZON 2K 20K 200K

,ogipi II, I,, .N.2 1.0 /6' j,*:

-...1"' 2r ---..O'6' .

Mal 1)E NAL I

VCF MODESWEEP LOG EXT

DIAL L Ir, I'JT

SWEEP RATESLOW MED FAST

SINE AMPLITUDE

4:11)MIN MAX

11 'XX L CNV 'HIGH

0 0MODEL 195 FUNCTION GENERATOR

0 ACTUAL SIZE

... for more details circle 112 on leader Service Card

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READERS' AID

Space contributed to help serve thepersonal needs of you, our readers.

For SaleLarge inventory of antique tubes,

still in the original "National Union"boxes. Also, an 8 -inch Admiral tablemodel TV, chassis 19A11S, manu-factured in 1948, in working condi-tion. Please write for details.ROBERT G. POIGHEE209 East 4th St.O'Falloh, Ill. 62269

Recording/Playback head for aWebcor Tape Recorder, Model EP200-1C. The head can be either newor used.R. C. SPENCE2407 Brooklyn Ave.Parkersburg, W. Va. 26101

Philco Model 37-116 console TV,Sparton Model 589 console TV, At-water Kent Model 55 table TV, Phil -co Model 77 console TV, Lyric tablemodel TV, and Motorola Model9T1T. Also a large quantity of ob-solete tubes.KELLER TV SERVICE517 W. 1st St.Fulton, N.Y.

Many old, never used tubes instock. Please write for details.LUCKAS ELECTRONICS43 Covert Ave.Floral Park, New York 11001

Have 246 radio tubes, dated 1940and up. Will sell as one lot only.Please write for details.ROBERT LEIENDECKER22-10 Ft. McNairWashington, D.C. 20024

Sixteen Radio and TV books. Allfor $25. Postage paid. Will not sepa-rate.DANIEL SEIDLER5827 S. Campbell Ave.Chicago, Ill. 60629

Business For SaleTV service shop, over 20 years in

the same location. Retiring for healthreasons. Please write for details.MELS TV & RADIO REPAIR161 N. W. MainBlackfoot, Idaho 83221

Established TV & Appliance Sales

& Service business. Franchise dealerfor RCA, GE and Maytag. Grossed$191,000 in 1973. Books open for in-spection. No real estate involved.Please write for details.AARON CAMPP.O. Box 447Dade City, Fla. 33525

Wanted

Updated tube chart for a SecoMutual Conductance Tube Tester,Model 107.HAROLD A. HOFFMAN11682 Magnolia St.Garden Grove, Ca. 92641

Schematic for VOM, Model K -30d, by Sanwa Electric InstrumentCo. Ltd.CLIFF BURGESSStage Coach Trailer Park, #27R.R. 1

Killeen, Tx. 76541

Capacitor, approximateinches by 3/4 inch. Value:at 2 kv DC.GEORGE W. GIFFR.D. #1Worthington, Pa. 16262

11/2

.0005 mfdsize

Knight Tape Deck Models KG -415 or KN-4450.G. CURRY279 Wallace AvenueToronto, Ontario, Canada M6P3N2

General Radiotelephone Co. Model614-B Multifunction Bridge; alsoschematic and service manual.M. B. WARRENBox 26Pontotoc, Miss. 38863

Sanyo Motor, No. KR -M1004, forSteno -Phone Answering Machine.MAR-SAL'S TV SERVICE84A Farren Ave.New Haven, Conn. 06513

Instruction manual and/or sche-matic for Seeburg Juke Box, Model100 J.H. R. PERKINS11211 SagelandHouston, Tx. 77034

Service data and schematic dia-gram for a Transwave Co., ModelTW-50, AM/FM stereo tuner andamplifier.J. HOWARD MILLER32 Blue Juniata DriveLewistown, Pa. 10744 II

... for more details circle 110 on Reader Service Card10 ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

Avoid serious trouble in color TV setsby using the rim replacement capacitor!

polyester .

film

This capacitor is GREAT for

90% of your film capacitor

replacements. But . . . it's NOT

designed for certaincritical applications.

The next time you replace a dipped tubular in oneof the newer color TV sets, don't automaticallyassume you're replacing an ordinary every -dayfilm or paper capacitor. If it happens to be a deflec-tion capacitor used for commutating or S -shaping,you need a polypropylene or polycarbonate filmreplacement with (1) high a -c current -carrying ca-pability; (2) close capacitance tolerance; (3) goodcapacitance stability. The standard replacement

SPRAGUETYPE PP

polypropylene film

SPRAGUETYPE PM

polycarbonate film

These capacitorsare a MUST for critical

commutating and S -shapingapplications.

capacitors used ii the industry, even our superiorType PS dipped tubulars, just won't do the job . . .

and they could cause the set to become inoper-ative again.

Play it safe ... dipped tubulars may look alikeon the surface, but there can be a big difference inthe film dielectric. Keep a supply of Sprague TypePP and PM capacitors on hand for those criticalsituations where ordinary replacements won't work.

SPRAGUETYPE

E PiviP pP 00 yY cP AR OR BP 0Y LNE AN TE F Fl

CAPACITORS@ WVDC Cap. Tol. D. x L. Cat. No. WVDC Cap. Tol. D. x L. Cat. No.

1.75

1.5

.01.015.033.06.081.2

.0018

.0022

@ 100

@ 150

@ 400@ 400@ 400@ 400@ 400@ 400

@ 600@ 600

±5%

±5%

±5%±5%±5%±5%±2%±5%

±5%±5%

.900 x 1.000

.800 x .937

.400 x .750.450 x .750.500 x .750.800x1.250.600 x 1.300.700 x 1.700

.400 x .750.400 x .750

PM141.75

PM15-M1.5

PP4-S10PF4-S15PP4-S33SPP4-S6OSPF4-S81SPF4-P20

PP6-018SPP6-D22S

.0039

.01.066.075

.022

.047.051

.0018

.002

.0033

.0039

@ 600@ 600e 600@ 600

@ 800@ 800@ 800

@ 1600@ 1600@ 1600@ 1600

±5%±5%±5%±5%±3%±5%±5%±5%±5%±5%±5%

.400 x .800

.500 x 1.250.800 x 1.250.750 x 1.250

.600 x 1.300

.700 x 1.250.800 x 1.250

.500 x 1.300

.500 x 1.300

.550 x 1.300

.600 x 1.300

PP6-D39SPP6-SlOSPP6-S66SPPS-S75S

PP8-S22SPP8-S47SPP8-S51S

PP16-D18PP16-020PP16-D33PP16-039

For cross-reference information on close -tolerance polypropylene andpolycarbonate film capacitors, showing original part numbers withcorrect Sprague replacements, ask your Sprague distributor for Cross -Reference Guide C-873, or write to: Sprague Products Company,65 Marshall Street, North Adams, Mass. 01247.

THE BROAD -LINE PRODUCER OF ELECTRONIC PARTS

4 16

SPRAGUETHE MARK OF RELIABILITY

... for more details circle 128 on Reader Service CardOCTOBER 1974, ELECTRONIC TECHNICIAN/DEALER 11

TECHNICAL DIGEST

The material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.

ADMIRALCurrent TV Models -70 Detent UHF Tuner Selector Knobs

In the parts lists for models using the 70-detent UHFtuners, all four parts of the UHF selector are listed asknobs. Actually, as shown in the illustration, there are twoknobs and two indicators. Notice that the tens indicator

has numbers 1-8 for the tens digit of channel numbers14-83, while the units indicator has numbers 0-9 for theunits digit of the UHF channel numbers.

The UHF channel selector knob should never be forcedpast the ends of the band (14 and 83). It is possible notonly to break off the posts on the units indicator, but alsoto break the tuner stops.

Color TV Chassis MID-Picture Tube/Deflection Yoke Replacement

The picture tube used in color TV receivers employingthe MIO chassis have a precision yoke permanently bond-ed to the CRT. Replacement of the picture tube or deflec-tion yoke requires changing the complete assembly. The

netvmstoWPM 7) nit .);!MID AS A.II

PlICISIO

YOKE WIRING DIAGRAM(Viewed from rear of set)

replacement picture tube, as supplied by the manufacturer,conies complete with the deflection yoke and wiring har-ness, except for the parts shown in the accompanying il-lustration.

When you replace the CRT assembly, remove the partsshown in the illustration and reinstall them on the re-

placement CRT after it has been mounted in the cabinet.The CRT you return for warranty adjustment must be

complete with exactly the same items that come with thereplacement CRT you install in its place.

NOTE: Use a Molex pin extractor to remove the pin(Item 10) from the 12 -pin Molex connector.

Do not attempt to reposition or remove the deflectionyoke from the CRT, because it is permanently bonded toit and serious damage can occur.

The replacement CRT is supplied completely readjusted(purity and convergence) by the tube manufacturer anddoes not require these adjustments when installed.

MAGNAVOX

Color TV Chassis T995-Quick-On Wiring

Most TV receivers in this year's product line do nothave the Quick -On feature. The T995 color TV chassiswas originally designed with the Quick -On feature andcontains a Quick -On transformer. The function of thistransformer is defeated as shown in the illustration. The

jumper wire from pin 1 to 7 on P/J 20 of the Interconnectboard shorts out the primary winding of the Quick -Ontransformer, T2, and disables the Quick -On option. Thefilament voltage to the picture tube is provided by thebottom winding on the power transformer, T1 (Part No.300316-1). However, the Quick -On transformer must re-main in the circuit because its secondary winding servesas a load in series with the picture tube filaments.

In the near future, transformer TI will be changedto part number 300316-2. At that time, the filament wind-ing of T1 will he 6.3 v AC and will be connected toterminals WI4 and WI7 of the Interconnect board. Trans-former T2 will be eliminated.

Color TV Chassis T995-Vertical Shading Bars

Vertical shading bars beginning at the left side of theraster and attenuating in density toward the center of thescreen are caused by inadequate ground contact betweenthe vertical and horizontal members of the chassis. Thisground contact is made by a U-shaped clip on the verticalchassis member. When the chassis is placed in the uprightposition, this clip makes ground contact with the horizon-tal chassis near the flyback transformer. The problem maybe corrected by simply bending the ground clip down-ward slightly to ensure its contact with the horizontal

continued on page 14

12 ! ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

The $19700package thatsolves the toughest ones!Our most expensive antenna package is one ofour best sellers. And that's not too surprising.There are lots of people who live in difficult re-ception areas who demand the best possiblepicture quality. And they are willing to pay -:or it.To satisfy that demand for excellence in TV re-ception, antenna dealers who have "tried themall" frequently end up recommending the CW-1001 with Winegard's special high gain, low noisepreamp. A great combination that makes the pic-ture look good and makes you look good.

What Makes The CW-1001 Different?Check These Winegard Features:II Unique wedge design offers increased signal

capture area in a much shorter and more com-pact antenna.

VHF vertical beam phasing rejects interferen-ces such as airplane and auto ignition noise.

II Patented UHF driven element assembly andpatented parabolic reflector screen provideunprecedented gain in an all band antenna.

11 Special lightning protection circuit preventsstatic electricity build-up and arcing.

FM control elements allow attenuation of strongFM signals where they interfere with TVreception.

Winegard 82-ch. CW-10E1with AC -982 preamplifie

Choice of 300 or 75 ohm downlead. New truss constructipn with three mast clamps

and super strong ell.psoidal booms of specialaluminum alloy tear- up to provide rugged re-sistance to wind and weather.

Special High Gain, Low NoisePreamps

Winegard's finest. Designed for the ultimate indeep fringe reception.

11 High gain and iow noise insures near perfect,snow -free color.

Two -section high pass filter and switch select-able FM trap.

Unique lightning protection circuit. For 75 ohm downlead only.This great combination of antenna and preampli-fier represents the finest effort of twenty years ofWinegard television reception research. See yourdistributor or write Winegard Company. For VHF only, use CW-2002 with AC -913 preamplifier.

WWI NEGARDTELEVISION SYSTEMS

Winegard Company / 3000 Kirkwood StreetBurlington, Iowa 52601

. for more details circle 135 on Reader Service CardOCTOBER 1974, ELECTRONIC TECHNICIAN/DEALER 13

TECHNICAL DIGEST...continued from page 12

member when the chassis is in the upright position. In thefuture, production will use two ground clips, one on eachchassis member. These clips will contact each other whenthe vertical member is placed in the upright position.

8 -Track Stereo Tape Players 1K8869/101404, 05, 06, 23, 24-MotorReplacement

These units are equipped by the manufacturer with oneof two different motors and associated starting capacitors,

DLit

AC

RED

I-1 2 5MED

MT

YIN

ORN

Cl/Cwt wing M 8056 IPart No SON002 141motor and 25 mid. IPart No 25N0022/starting capacitor

AC

NT

RED

(ILK

WNT

OM

" MFDCircmt using M 812A Wart No 70N00.1 71motor and 13 old (Pan No 75X615 80091starting .00CPIOf

as shown in the accompanying illustration. Before order-ing a replacement motor and/or starting capacitor forthese units, determine which of the two possible motorsand/or starting capacitors are used in the unit you areservicing and use the corresponding manufacturer's partnumber.

PHILCO-FORD

Monochrome TV Chassis-Service Check of Filament Diode Rectifier34.8054-23

A number of Philco-Ford monochrome receivers havea solid-state rectifier connected in series with the series -string filaments of the tubes and CRT. (The present partnumber of this rectifier is 34-8054-23. The part numberpreviously was 34-8054-7.)

Because of the action of this half -wave rectifier, the

Security is theinfant TV was in 1954

By 1994 most American homes and businesses Nill havesecurity systems just as most have a TV set today.

In 1974 some electronic service technician andcommunication specialists are going to enter the security

field by installing 8 to 10 security systems.

PLC Security Systems are designed and prepackaged forinstallation by electronics businessmen, and the proof is in

the PLC catalog. Send for your free copy today.

PLC Electronics, Inc.39-50 Crescent St., L.I.C., N.Y. 11101

total rectified voltage across the filament string should beconsiderably less than the 115-120 volt AC line voltage.If the filament diode should become shorted, full linevoltage will be applied across the filament string, reducingtube filament life.

Philco-Ford recommends that the filament diode bechecked whenever any tubes are replaced, particularly if atube is being replaced because of filament failure. Thediode can be checked by connecting an AC voltmeter be-tween the output of the diode and ground (across the fila-ment string). If the voltmeter reading is equal to or al-most equal to the line voltage, the diode should bereplaced. Because the rectified output of the half -wavefilament rectifier is neither pure DC nor an RMS sinewave, a normal reading will be between 55 and 80 volts,depending on the type of meter used.

An alternative method of checking the filament diodeis to turn off the power and measure the forward and re-verse resistances of the diode.

Color TV Chassis 22080, 21KT40/41-Buzz or Hum at Low Setting ofVolume Control

If hum or buzz is encountered at low levels of volumein any of these chassis, the following procedures shouldremove or reduce the hum or buzz to a point where it willno longer be objectionable:1) Remove the blue lead of the volume control cable

CHROMA AND SOUND

PANEL

N99

TELL°,LEAD

0REMOVE VOL. CHENCABLE CND LEAD

LEAD

°CH

SOLDER TO

CHASSIS

CROUND

LEAD

BLUELEAD

O

5.

CHASSIS BOTTOM VIEW

BLUE LEAD®(REMOVED)

VOLUME

CONTROL

CABLE

CHASSIS

SUB -BASE

from lug 2 on terminal B4.2) Connect a 1K, 1/2w resistor between lug 2 and the bluelead.3) Remove the ground lead of the volume cable from lugG96 on the PW panel and reconnect it to lug 5 (ground)on terminal B4.4) Securely solder ground lug 5 on terminal B4 to thechassis, for improved mechanical grounding.5) Dress the yellow lead connected between lug M99 (onPW panel) and B4-4 away from filter choke (T2) and atright angles to the choke core, as shown in the accompany-ing illustration.

MOVING?Be sure to let us know your new address.Please enclose a complete address labelfrom one of your recent issues.


14 ELECTRONIC TECHNICIAN/ DEALER, OCTOBER 1974

CHANNEL MASTER PUTSGREAT RECEPTION

TO THE TEST!15

14

13

12

11

10

9

8

7

6

5

4

3

1

0

-1

-2

-3

-4

VHF LO -BAND FM

2 3 4 5 6CHANNEL

VHF HI -BAND UHF15

14

13

12

11

10

9

8

7

6

5

4

3

2

0

1

-2

-3

-4

7 8 9 10 11 12 13

CHANNEL

With the Ultra Hi Crossfire --engineered withthe performance that's made the CrossfireSeries the world's most powerful and pop-ular antenna ---plus a retuned UHF sectionthat delivers constant high gain across theband.

When tested against all other antennas ofcomparable size and element count, theUltra Hi Crossfire proves its high standingby outperforming all others ---in all criticalgain areas! No other antenna in its categorycan approach the Ultra Hi Crossfire's com-bined UHF and VHF performance.

14 25 35 45 60

CHANNEL70 83

Ruggedly engineered with extra heavy dutyelements and tough construction, the UltraHi Crossfire has the guts to stand the testof the worst wind and weathering con-ditions possible.

Your Channel Master Distributor has actualresults ---see for yourself how the Ultra HiCrossfire stands the test of great reception--and comes out on top of its class!

Channel Master Ultra -Hi Crossfire... for more details circle 104 on Reader Service Card


ANY3

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AN EXTRAORDINARY ID ED


A Realistic Approach ToTV Tuner Troubles

Proper cleaning and lubrication plus tuner

substitution techniques and knowing when to turnover the tuner to a spec alist are the keys toprofitable tuner servicing

By Al Friedman

The only real moving part in a TVreceiver is the tuner. With familiesdoing so much "channel hopping"these days, the tuner takes quite abeating. It's no wonder, then, thattuners account for so many TVtroubles.

Unfortunately, tuner trouble isnot particularly easy to spot. It'seasy to mistake tuner troubles forIF or AGC troubles, and it is equal-ly easy to mistake trouble in someother circuit for a tuner trouble.

The most common problem

The author is president ofChemtronics, Inc.

Fig. 1-The first step in proper tuner clean-ing and lubrication: Remove the tuner, open itup and carefully spray all of the contacts witha tuner cleaner. Then wipe with a clean, lint -free cloth.

caused by tuners is a noisy, or"snowy," picture on one or morechannels. Defective tuners can alsocause complete loss of sound andpicture, picture flashing, picture orsound distortion, picture pulling, orblanking of part of the raster.

CLEANING AND LUBRICATIONMost tuner troubles are caused

by dirty or corroded contacts.Therefore, if you suspect tunertrouble, clean and lubricate thetuner thoroughly.

Using an extender tube to sprayinto the hole that gives access to

Fig. 2-The second step in proper tuner clean-ing and lubrication: Spray all contacts witha cleaner/lubricant and then rotate the rotora few times while checking to see that thestator contacts press against the rotor con-tacts with sufficient pressure to insure a

positive contact and a good rubbing (clean-ing) action.


New lifefor the old

test jig.Make it a solid-state tester with ournew Sylvania Rig-A-Jig1M CK1900X.

The old test jig you used with tube -setchassis can work full time again. Connect thenew Sylvania Rig -A -Jig CK1900X to it andpresto-you have a test jig for solid-state andhybrid TV as well.

The Rig -A -Jig CK1900X has a self-containedanode voltmeter, a complete set of yokeprogrammers, and an internal focus supply.

And, it will give you a close impedancematch in receiver deflection circuits for almostany hybrid or so. id -state sets you might haveto service. And these connections are easy tomake with up -front, highly accessiblereceptacles.

With simple modifications, you can givenew life to your old test jig so it can handle setswith 350 to 500µH SCR sweep, 1 and 3 mH fortransformer sweep, or tube and hybrid sets withyoke inductances from 7, 12, and 16 mH.Instruction sheets and set-up manual are alsoincluded.

Ask your Sylvania distributor for moreinformation.

Rig -A -Jig CK1900X. The newest addition tothe versatile family of Chek-A-ColorTM1 TestEquipment.

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the tuning slug is not the best ap-proach. Sometimes it does the job,sometimes it doesn't. Instead, re-move the cover from the tuner andspray all contacts thoroughly. Avoidspraying neutralizing capacitors andother critical parts. Rotate the tun-er as you spray, to make sure youhit all contact surfaces.

Cleaning and lubricating a dirtytuner is actually a two-step process.Start with an aerosol tuner cleaner,as shown in Fig. 1. Made primarilyof freon or fluorinated solvents,these sprays "degrease" the tuner.That is, they dissolve all petroleum-based products such as oil, greaseand the residue of tuner lubricants.Aerosol tuner cleaners also washaway dirt and dust and other for-eign matter, leaving contacts cleanand dry. If you can wipe tuner con-tacts after spraying with a tunerwash, do so with a soft, dry, clean,lint -free cloth. However, if tunercontact points are inaccessible,don't worry about it. Most tunercleaners do an excellent job with-out wiping.

The second step in restoring atuner is to use a cleaner/lubricant,as shown in Fig. 2. The most effec-tive types of cleaner/lubricants con-tain silicons, or tiny, hollow, polish-ing particles. These particles cleancontacts until they are shiny, thencollapse to prevent abrasion of pre-cious metals. They are excellent forremoving sulfurization and corro-sion.

Tuner cleaner/lubricants alsocontain a light, dry, chemical-ly inert lubricant which protectstuner contacts, prolonging the lifeof the tuner. Laboratory tests re-veal that ordinary tuners typicallylast about 18,000 revolutions beforewearing to the point of causingsnow in the picture. Properly lub-ricated tuners last about 40,000revolutions (more than twice aslong) before showing similar signsof wear.

Remember, even the best tunercleaner is ineffective unless the con-tact points rub against something.It is the rotor rubbing the cleaneragainst the stator that producescleaning action. In many tuners, itis very hard to see whether springtension is adequate, but with barrel -type tuners, it's easy. Remove the

Fig. 3-Determining whether or not a trouble symptom is caused by a detect in tne tuner issimplified by the use of a TV tuner substitution unit like that shown here. See text for detailedexplanation of use.

barrel and check the contactsprings. If the springs are bentdown too far, use a small screw-driver or solder pick to bend themup again. While you have the bar-rel out, spray each contact strip andeach spring with a washing spray.Wipe dry with a clean cloth. Then,re -spray with a good cleaner/lubri-cant.

In many cases, thorough cleaningrestores tuners to like -new perfor-mance. Customers who complain ofsnowy pictures or that they have towiggle the channel selector knob toget a good picture are pleased tofind that you've "made their setoperate like new again."

TUBE SUBSTITUTIONIf cleaning and lubricating don't

do the job, try changing the tunertubes. Don't bother checking tunertubes on a tube tester. RF and os-cillator tubes frequently check goodon a tester but fail to perform in aset. Tube substitution is the onlyreliable test. In fact, you may haveto try several tubes from your cad-dy before you find one that reallyoperates well.

One word of caution here: Iftube substitution restores the tunerto working order, check out the de-fective tube on a tube tester any-

how. You might find that it is gassyor shorted. Shorted and gassy tunertubes are often accompanied by aresistor that is burned completelyopen or the value of which has beenchanged because it has been over-heated. Take a few minutes tomake a careful visual check of alltuner resistors, to reduce the pos-sibility of a callback.

TROUBLESHOOTINGTECHNIQUES

So far, we have dealt with thetwo most common and easily spot-ted tuner troubles-defective tubesand dirty contacts. However, moredifficult problems do arise. In fact,the tuner is probably the most dif-ficult part of a TV set to service.

SubstitutionWhen you do encounter a diffi-

cult TV tuner problem, your firststep should be to isolate the prob-lem definitely to the tuner. Other-wise, you might spend a lot of timepoking around in the tuner whenthe problem actually is in one ofthe IF stages or in the AGC sys-tem.

In the past, the only reliable wayto isolate a problem to the tunerwas to substitute a known goodtuner. Today, TV tuner substitution

22 I ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

units, such as that shown in Fig. 3,do the job better and more easily.

To substitute the tuner subberfor the VHF tuner in the TV, dis-connect the IF cable from the TVset tuner and connect it to the 40 -MHz IF output of the subber.(Most subber manufacturers makethis easy by supplying output ex-tension cables.) Connect the anten-na lead to the tuner subber input,turn the TV set on and switchthrough the channels. If the setoperates normally with the subberconnected, but not with its owntuner, it's a safe bet that the TVtuner is defective. If the subberdoes not restore normal operation,the tuner in the TV is probablyoperating normally and the trou-ble is the AGC, IF, or some subse-quent stage. (Tuner rubbers can al-so be used to check out AGC andIF stages.)

You can also check out a UHFtuner with a subber. UHF tunersin today's sets operate in tandemwith the VHF tuner. That is, theVHF tuner provides B+ to theUHF tuner and 40 -MHz amplifica-tion of the UHF tuner output. Tolocalize a trouble to the UHF tuner,disconnect from the VHF tuner theUHF output cable and plug it intothe appropriate jack on the tunersubber. Switch the VHF tuner tothe "U" position. (The UHF tuneris supplied B+ only when the VHFtuner is in the "U" position.)

Then, connect the tuner subberto the IF cable of the TV and tunethe UHF tuner to an operationalchannel. If the UHF tuner operatesnormally with the tuner subber butnot with the TV VHF tuner, theproblem is probably in the 40 -MHzamplifier section of the VHF tunerin the TV. If the VHF tuner in theTV operates normally, but theUHF tuner doesn't, even when con-nected to the subber, the UHF tun-er is probably defective.

Allow Yourself 15 Minutes toFind the Fault

Once you isolate the problem tothe tuner, you have to decidewhether to fix it yourself or to sendit to a tuner repair specialist. Yourcustomer might prefer that you fixthe tuner yourself, because his setmight be restored to operation

sooner. On the other hand, tunerrepair is not always easy, especiallyif you don't have the right equip-ment.

A good, general rule to follow isthis: If you can't spot the tunertrouble within 15 minutes, send itto a tuner repair specialist. Other-wise, you might spend an hour ortwo of your time and then still haveto send in the tuner. Besides, yourtime is worth more than the $10-$15 you pay to have a tuner re-built.

Quick ChecksUse your 15 minutes for a quick,

visual check of the tuner compo-nents. You might notice a relative-ly obvious problem. Then, use atest socket to make voltage andresistance checks at each of thetube pins. A low value of plate orscreen voltage is usually an indica-tion that a capacitor in the plate orscreen circuit is leaky or shorted,or that a series resistor has changedvalue.

Incorrect voltage at the mixergrid means that the oscillator is notoperating. The mixer grid voltagein a tube -type tuner usually is be-tween -1.5 to -3.5 volts DC. Oneof the most common causes of os-cillator failure is a faulty plate loadresistor. Also, be sure to check outthe balun in the tuner input, whichis another common source of trou-ble.

Even if you find the faulty com-ponent within 15 minutes, yourtroubles might not be over. Exactreplacement parts for tuners are notalways easy to obtain. And sometuner electrical components also arevery hard to obtain.

Solid-state tuners, UHF tunersand foreign -built tuners are partic-ularly difficult to service. You'reprobably better off sending thesetuners to a specialist after only themost superficial checks.

Repair Precautions

When replacing tuner compo-nents, cut lead lengths to matchexactly those of the original part.Solder in the new part very careful-ly, keeping all lead dress exactly asyou found it. Moving coils or leadseven a little can cause serious de -tuning, especially in UHF tuners.

PREPARING THE TUNERFOR SHIPMENT

TO A SPECIALIST

If you do decide to send the tun-er to a tuner repair specialist, re-move it very carefully. Don't un-solder leads. Clip them carefully,leaving a little of each colored wireon the terminals. Otherwise, you'llhave to mark each lead or make adrawing which shows where eachlead is to be connected when thetuner is reinstalled.

Don't send mounting bracketswith the tuner. Remove the brack-ets and fasten them securely to thechassis.

Do send the tubes along with thetuner. Remove them from theirsockets, wrap them carefully andpackage them so they won't break.If you don't send the tubes, or ifthe tubes break in transit, the tunerrepair specialist will have to substi-tute new ones.

PROFITABLE PREVENTIVEMAINTENANCE

Every tuner should be cleanedand lubricated at least once a year.You should offer to perform thisservice on every call you make.

Whether the original problemwas a faulty tuner or a burned outfuse, your first responsibility is toget the set operating again. Onceyou've accomplished this, simplyask the customer if he or she wantsthe tuner cleaned. Explain that youwill do a thorough, two-step job ofdegreasing and then lubricating histuner, so that it will once againoperate smoothly.

The charge for this extra serviceshould be $4.00 to $6.00. Normal-ly, it will take you about 10 min-utes and 50 cents worth of spray(washer and cleaner/lubricant) todo the job properly. Most custom-ers are willing to pay for this ex-tra service because the results areso obvious. The channel selectorturns more smoothly and "snow"tends to "melt" away.

Don't skimp on the sprays youuse. Use high -quality electronicchemicals. The few cents you thinkyou save using so-called bargainsprays are definitely not worth whatyou will lose in call-back time andreputation.


New in Color TV for 1975 -Part II By The ET/ D Editorial Staff

Last month, in the first of a series about the new color

TV's for 1975, the composition and general featuresof the 1975 color TV lines were presented.

Beginning in this, the second part of the series, the

new and significantly changed circuitry in thechassis of each manufacturer's new line will beanalyzed, starting with General Electric

Six chassis are used in GE's colorTV line: The YA and MC chassisare new, modular, all -solid-statetypes. (The design of the "M"series chassis is similar to that ofthe MA chassis, which was intro-duced in 1973.) The MB -'75 andQB are carry-over chassis withsome circuit changes. Chassis CDand HE are carry-over hybrid typeswithout any significant changes.Many of the YA circuits are similarto those in the JA/QA chassis.

Modules in which major circuitmodifications have been made havebeen assigned new catalog referencenumbers to provide identificationin the field.

YA CHASSIS

The new YA chassis employsseven plug-in modules, on whichare contained approximately 90 per-cent of the electric components inthe TV receiver.

All five of the integrated circuitsused in the YA chassis plug intosockets, to simplify troubleshootingof the chassis. (An additional ICis used in the Automatic ColorAveraging and 3.58 -MHz subcar-rier circuits, compared to the fourused in the JA/QA chassis.) Othercomponents which plug into socketsinclude the audio- and horizontal -output transistors, the high -voltagerectifier and the B+ and AC fuses.

Some of the circuits in the YAchassis are almost identical to thosein the discontinued JA and QAchassis. (These chassis were

equipped with a large, "standard"circuit board. Adaptation of the"basic" JA and QA chassis to thedifferent sizes of picture tubes andnonstandard features of the variousmodels in which these chassis wereused was accomplished by plug -onmodules.)

QuadlineTM Picture Tube

The new QuadlineTM picture tubeused with the YA chassis isequipped with a shorter in -line gunassembly, a slotted shadow mask

Fig. 1-Front view of the QuadlineTm picturetube screen showing "exploded" representa-tions of vertical phosphor stripes, electronbeams and matrix openings. Courtesy ofGeneral Electric.

and a phosphor screen with alter-nate red, green and blue verticalstripes of phosphor which extendfrom the top of the screen to thebottom (Fig. 1). In addition, alight -absorbing layer of black ma-terial (called a black matrix) is de-posited on the inside of the face-plate. This layer has tiny, rectangu-lar open areas (represented in Fig. 1

by the staggered rows of groups ofthree rectangles) through which thethree in -line electron beams excitetheir respective phosphor stripes.The electron beams (represented inFig. 1 by broken lines) are largerthan the matrix openings in thehorizontal direction and smaller inthe vertical direction.

The gun assembly of the Quad-lineTM picture tube is smaller be-cause the need for a convergenceyoke assembly has been eliminatedby the use of a toroidal -wound yokewhich is equipped with windings forboth deflection and dynamic con-vergence. Elimination of the con-vergence yoke assembly, in turn,has eliminated the need for con-vergence pole pieces in the in -linegun assembly, thereby making pos-sible a shorter picture tube neck.

The purity and static conver-gence magnets have been combinedon one assembly, which is posi-tioned on the picture tube neck sothat the static convergence magnetpole pieces are placed over thespace between the focus electrodeand second anode.

The arrangement of the phos-phors in vertical stripes has elimi-nated purity problems caused bymisregistration of the beam in thevertical direction. Consequently,purity correction is required only inthe horizontal direction. (To avoiddecentering the raster vertically,move the purity magnet tabs anequal amount, and not more than45 degrees from the vertical plane.)

The purity magnet/static con-vergence assembly has two sets ofstatic convergence magnets. Theseare used only for static convergenceat the center of the screen. (Theconvergence at the edges of theraster is accomplished by fourdynamic adjustments on the con-vergence module.) The two mag-nets of one set move the correspond-ing outside beams vertically (Fig.2A), and the two of the other setmove the corresponding outsidebeams horizontally (Fig. 2B).

The small scanning lines on thescreen and the horizontal rows ofslots in the aperature mask canvisually "beat" together, causingintensity modulation which produc-es weaving lines called moire. If themoire pattern is too noticeable,


How to crackthe Japaneseoriginal equipmenttransistor problem.

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These are not "Universal Replacements."They are exactly the same parts used inoriginal equipment. They're made in Japan,but are now as close to you as your localIR Distributor. Each DK22 Kit contains oneeach of the 31 types listed in the box atright to put exact replacements right atyour fingertips.

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Last year, more Japanese -built TV's were sold in thiscountry than any single U.S. brand. And the sametransistors are used in Japanese stereos. tape record-ers and other entertainment equipment. Crack thisfast-growing, lucrative service market with a DK22 Kit.Call your local IR Distributor today. You'll get a $42.78value for only $34.23 . . . less than the price you'd pay

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slight adjustment of the HEIGHTcontrol should reduce it. Adjustingthe FOCUS control for good high-light focus will moderate any ten-dency of moire at the edges of theraster.

YA VHF Tuner

The VHF tuner used in this chas-sis is a turret type equipped with aMOSFET amplifier, as in the JA/QA color TV chassis. The VHFinput impedance of the tuner is 75ohms.

Custom Picture ControlA new Custom Picture Control

is featured in conjunction with theOne -Touch Color system on manyof the large and small -screen re-ceivers in GE's 1975 color TV line,including those which are equippedwith the YA chassis.

The One -Touch Color circuitconsists of the color, tint, and bright-ness control circuits. These samecircuits are used whether the TVset is placed in "manual" or "auto-matic" operation (determined bythe position of the Auto button),but separate sets of controls foreach function are used in the twomodes of operation. If the "auto-matic" controls are switched in, the"manual" controls are switched outof the circuit, and vice versa.

The Custom Picture Control per-mits balanced adjustment of con-trast, brightness and color. Onceeach of the controls have been ad-justed for the desired ratio of con-trast, brightness and color, this ratiowill remain constant during subse-quent adjustments of the CustomPicture Control.

A differential -pair gain -controlcircuit is used in the video amplifiercircuit. This circuit allows DC con-trol of video amplification, permit-ting the Custom Picture Control tovary the contrast, brightness, andcolor simultaneously.

The DC -controlled gain circuitused in the YA chassis is shown inFig. 3. It consists of a currentsource (transistor Q325), a differ-ential pair (Q320 and Q330), anda DC feedback circuit, which in-cludes transistor Q335. Transistor0325 is the current source for bothQ320 and Q330. When 0320 andQ330 conduct equally, one-half of

Fig. 2-Static convergence magnets usedwith luadlineml picture tube. A) Vertica'static convergence pair. B) Horizontal staticconvergence pair.

the current through Q325 flowsthrough Q320, and the other halfflows through 0330. The videosignal is coupled to the base of0325, and one-half of the videosignal flows through 0320 and isbypassed back to the power supply,but the half that flows through0330 is coupled to the final videostages.

The bias of Q320 is fixed at about7.7 volts, but the voltage at thebase of Q330 is controlled by thesetting of the Custom Picture Con-trol. When this voltage is low, Q330conducts very little and the majorityof the video signal is bypassedthrough Q320 to the power supply.The signal fed to the final videostages will be small, and the picturewill have low contrast. When thevoltage is high, 0330 conductsmore, and most of the video signalwill be fed to the final video stages,and the picture contrast will behigh.

The collector of Q330 is connect-ed to the base of Q335, and theemitter of Q335 is connectedthrough resistor R343 to the baseof 0330. This inverse DC feedbackstabilizes the operation of the cir-cuit.

The DC restoration circuit (Fig.4) includes capacitor C348, diodeY345, resistor R352, and the

Fig. 3-Simplified schematic of the DC -con-trolled gain stage used in General Electric'sJA color TV chassis. Courtesy of GeneralElectric.

BRIGHTNESS control. The compositevideo signal has positive -going syncpulses. Capacitor C348 chargesthrough Y345 on the tips of thesync pulses and creates a DC volt-age at the base of Q345 which isproportional to the peak value ofthe sync pulses. This DC voltage,along with the AC video signal, isamplified by the succeeding stages.Since the circuit operates on peaksync pulse value, the amount of DCrestoration can be more than 100percent because the voltage differ-ence between the sync pulse tipsand the black level varies with sig-nal amplitude. For example, if thevideo signal has a 2 -volt p -p value,the voltage between the pulse tipsand black level is 0.5 volts. If thevideo signal drops to 1 volt p -p,the difference between the pulsetips and black level is only 0.25volts. If the black level was setproperly on the 2 -volt p -p signal,the picture will appear too dark onthe 1 -volt p -p signal. Resistor R352"softens" the DC restoration and al-lows capacitor C348 to charge clos-er to the actual black level. This al-leviates the problem of excess DCrestoration. The BRIGHTNESS con-trol varies the voltage at the junc-tion of R352 and R391, allowingthe screen black level to be set ac-cording to the customer's prefer-ence. The BRIGHTNESS CENTERINGcontrol, R374, varies the range ofthe BRIGHTNESS control.

The Custom Picture Control cir-cuit, Fig. 5, provides a means of


20

0335

Fig. 4-Simplified schematic diagram of the

DC Restoration Circuit used in General Elec-

tric's lA color TV chassis. Courtesy ofGeneral Electric.

varying a DC voltage which con-trols video gain, chroma gain,brightness, and the Automatic Col-or Averaging Circuit (ACAC).These circuits are all DC -controlledand are interconnected by resistorsR358, R372, R375, and R377, inthe emitter circuit of Q355. TheCustom Picture Control is connect-ed to the base of transistor 0355by coil L360. Changes in the basevoltage of 0355 are fed to thevideo, chroma, brightness and coloraveraging circuits through Q355and the resistors.

Automatic Color AveragingCircuit (ACAC)

Color intensity variations fromchannel to channel are partly im-proved by the Automatic ColorControl circuit (ACC). The ACCcircuit operates on the burst level,and the ratio of burst to chromalevel is not the same from channelto channel; consequently, some col-or variations continue to be present.The YA chassis has a second auto-matic correction circuit to minimizethese variations. It is called theAutomatic Chrome,' Averaging Cir-cuit (ACAC).

The ACAC circuit detects theaverage amplitude of the chromasignal and adjusts the chromagain to provide a more consistentcolor level, as shown in Fig. 6. Thebase of the ACAC transistor, Q280,receives the chroma signal from theemitter of Q230. The collector of0280 is connected through R280 tothe color control terminal of in-tegrated circuit IC210. ResistorR283 and R284 cause the base ofQ280 to be biased below its con-duction point. The emitter of Q280

TO BRIGHTNESSCONTROL CIRCUIT

III 0330 BASF

TO COLORCONTROLCIRCUITTO ACACCIRCUIT

I SK

PICTURECONTROL

F13114

I SK

Fig. 5-The Picture Control Circuit providesa method of varying a DC voltage which con-trols the ratio of video gain, ch oma gain,brightness, aid the Automatic Color Averag-ing Circuit (ACAC). Courtesy of GeneralElectric.

Fig. 6-The Automatic Color Averaging Cir

cuit (ACAC) employed in the Gereral ElectricJA color TV chassis detects the average am-plitude of the chroma signal and adjusts thechroma gain to provide a more consistentcolor level. Courtesy of General Electric.

is coupled to the Custom PictureControl circuit by R375, allowingthe Custom Picture Control to setthe threshold point at which Q280will conduct. When the chroma sig-nal at the base of Q280 reaches thethreshold point, Q280 will conductand its collector voltage will de-crease, lowering the voltage at pin3 of IC210. This decreases the col-or gain. The circuit time constantsare such that instantaneous colorlevel changes will not change thegain. Only long-term changes willcause the circuit to operate, and theaverage color level will be moreconsistent.

"M" SERIES CHASSIS

The design of the "M" serieschassis is similar to that of the basicMA chassis and includes the follow-ing features:

"Grouped" construction of themain chassis, which permits remov-al of individual functional assem-blies.

Plug-in connectors, used in in-terconnecting wiring.

Easy access to components,test points and adjustment controls.

Individual plug-in modules.

Service Adjustment Controls(MC and MB -'75 Chassis)

The service adjustments areplaced in the same locations as theyare on the MB chassis, with the fol-lowing exceptions on the MB -'75and MC chassis.

The SERVICE SWITCH iS elimi-nated, and the gray scale is set upby viewing the full raster.

The CHROMA SET, RANGE, andTINT CENTERING controls have beeneliminated because of the AUTO -AD-JUSTMENT controls, which are cus-tomer accessible.

A new regulation circuit,which is non-adjustable, eliminatesthe HIGH -VOLTAGE control.

Circuit and ComponentMod-fications (MC Chassis)

A new version of the Low -Volt-age Regulator Module, No. EP93-X80, is used in the MC chassis. Adiode and capacitor have beenadded to provide a different 200 -volt source, which is necessary inthe MC chassis circuitry. This mod-ule will function in early "M" serieschassis, but the older No. EP93X43module will not function properly inan MC chassis.

The power supply will be stockedas a complete assembly, but the newpower transformer will be avail-able separately.

The Video Low Level Module,No. EP93X74, supercedes the EP -93X38 version used on the MBchassis.

A new Signal Interconnect Boardis used on the MC chassis, to ac-commodate the new secondary con-trols and the 200 -volt B+ distribu-tion circuits. The new board is notinterchangeable with other "M"boards because of the deletion ofthe High -Voltage Regulator Mod-ule.

A new Vertical Module, EP93-X75, replaces previous versions ofthe vertical module. Many changeshave been made in the vertical cir-cuitry, to provide better reliability.The new vertical module can bemodified for use in earlier chassis


by clipping open one lead of 1-megohm resistor R730, to electri-cally remove it from the circuit.

Constant Voltage PowerTransformer (CVT) (MC Chassis)

The power supply assembly inthe MC chassis physically resem-bles that in the MB chassis, but acloser inspection will reveal a num-ber of changes. The CVT powertransformer is taller than a conven-tional type and it has a 3.5-mfd,oil -filled, AC capacitor strap -mounted (with two screws) to theright side of the power supply chas-sis.

The constant voltage power trans-former self -regulates all of its sec-ondary voltages. Its primary andsecondary windings are looselycoupled by assembling the windingsto separate legs of the core, asshown in Fig. 7. The regulating cir-cuit consists of an additional wind-ing connected to the secondary ofthe transformer, with an AC capac-itor shunted across both of thewindings.

For self -regulation, a powertransformer must operate in a non-linear manner. The secondary volt-age must not change even thoughthe primary voltage changes. This isaccomplished with the constant volt-age transformer, shown electricallyin Fig. 8. The primary and second-ary windings are isolated by wind-ing them separately, with magneticshunts between them. When a volt-age is applied to the primary wind-ing, current flows and flux is es-tablished, as in the conventionaltransformer, but, in addition, theshunts establish a path for some ofthe primary flux to return to theprimary without coupling to thesecondary, and for some of thesecondary flux to return to the sec-ondary without coupling to theprimary. This isolates the primaryfrom the secondary winding. Whena capacitor is shunted across thetotal secondary, a capacitive currentwill flow through the entire second-ary winding and a flux will be es-tablished which will add in -phaseflux with the primary flux under thesecondary winding. This actioncauses the core under the secondarywinding to saturate without saturat-ing the core under the primary wind-ing, making the device a non-lineartransformer. Under a normal load,

the saturated secondary will main-tain a constant output voltage overa wide range of primary voltages,and the unsaturated primary doesnot draw excessive line current.

If AC line voltage is applied tothe MC chassis through a variableauto -transformer, the AC output atthe secondary of the power trans-former will be a sine wave whenthe input voltage is between zeroand approximately 2 volts. Wheninput voltage is increased above thislevel, the output waveshape is amodified square wave, and remainsso, with only increases in amplitude,as the line voltage increases to 130volts AC.

With 70 volts AC applied to theprimary of the transformer, its core

CONSTANT VOL TAGS TRANSFORM.

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Fig. 1-The primary and secondary windingsof the Constant Voltage Transformer areloosely coupled by assembling the windingsto separate legs of the core. Courtesy ofGeneral Electric.

under the secondary winding isnearly saturated, and the 140 -voltDC supply is 80 percent of its ratedvalue. At 105 volts AC, thecore is saturated and remains satu-rated during any further increasesin primary voltage.

Voltage regulation of the powersupply is approximately 3 percentfrom 105 volts AC to 130 volts AC.If the line voltage changes, the out-put voltage will stabilize in about1.5 Hz.

This power transformer provideshigh attenuation of high -frequencyvoltage surges that enter the pri-mary winding.

Troubleshooting the Low -VoltagePower Supply (MC Chassis)

If the correct meter is not em-ployed when measuring the square -wave AC output voltages of theCVT, incorrect meter readings willbe obtained. The AC circuits usedin VTVM's read peak or peak -to-peak voltages, regardless of thewaveform of the voltage being mea-sured. When measuring a square-wave voltage, the RMS scale of aVTVM will be inaccurate, becauseit was calibrated for a sine wave.The peak -to -peak VTVM scale isaccurate, but it is not a normalpractice to use this scale when mea-suring power transformer voltages.

Use a meter that will accuratelymeasure the RMS of any AC volt-age. Since this feature usually isfound only in laboratory type me-ters, the next best is a VOM, whichis usually non -peak -reading andmeasures the average value of anAC voltage. (All AC voltages inthe MC chassis are measured witha VOM and will be marked and so

Fig. 8-Schematic diagram of the power supply used in General Electric's MC color TV chassis.Courtesy of General Electric.


indicated on the MC chassis sche-matic diagram.)

High -Voltage System(MC Chassis)

There are significant differencesbetween the high -voltage system inthe MC chassis and that used in theMB chassis. These differences arefound in the high -voltage generationand regulation circuits, which pro-duce 30 kv of picture tube secondanode voltage.

A quadrupler is used for thehigh -voltage multiplier, instead ofthe tripler used in the MB chassis.The quadrupler functions the sameas the tripler, except that there aretwo additional diodes and capacitorsin the multiplier, to produce thehigher level of second anode voltageneeded by the picture tube used withthe MC chassis.

Boost Voltage Source(MC Chassis)

Another diode at the input of thehigh -voltage multiplier (same asY1661 in the MB chassis) rectifiesthe negative portion of the flybackpulse to produce a voltage at Ter-minal 6 of T1700, which is filteredby C1602, R1626 and C1661 (Fig.9), to achieve the 650 volts fromthe flyback system. The voltage isthen boosted by 200 volts throughR1628, to produce a total boostvoltage of 850 volts. This replacesthe function of Y1601, R1602 and

C1602 in the MB chassis.

High -Voltage Regulation(MC Chassis)

A saturable reactance high -volt-age regulator system is used in theMC chassis, eliminating the needfor the Error Amp/High-VoltageRegulator Module used on the MBchassis.

Regulation of the 30-kv secondanode voltage is achieved by theSaturable Reactor, T1704, whichhas three separate windings, asshown in Fig. 9. The control windingis in series with the primary of thehigh -voltage transformer (T1700)and the 143 -volt DC supply to thecollector of the horizontal -outputtransistor, Q1701. A second wind-ing is in parallel with the primarywinding of the high -voltage trans-former, and the third winding is inseries with the horizontal coils ofthe deflection yoke.

When current flow is increasedthrough the control winding, satura-tion increases in the core and theinductance of each of the threewindings is reduced. If the currentis reduced, the inductances will in-crease.

If the load on the horizontal sys-tem is increased by increasing thebrightness level of the picture, cur-rent flow is increased through thehigh -voltage transformer primaryand the control winding of T1704.The increase in current increases

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Fig. 9-Schematic diagram of the high -voltage system used in General Electric's MC colorTV chassis, which generates and regulates 30 kv of second ar ode voltage. Courtesy of GeneralElectric.

the saturation of the saturable re-actor core, thus lowering the induc-tance of the shunt winding. This, inturn, lowers the total primary cir-cuit inductance, because the primaryand shunt windings are in parallel.The lower inductance of the primarycircuit shortens the retrace time.This narrows the flyback pulse andincreases its amplitude, to maintaina constant high voltage. The induc-tance of the series winding is alsolowered when core saturation is in-creased. This lower impedance inthe yoke circuit increases the yokecurrent, to maintain correct sweepwidth. If the brightness is reducedto decrease the load on the horizon-tal system, the opposite of the pre-ceding occurs.

Because of capacitive effects inthe saturable reactor, the controlwinding has a tendency to ring. Ca-pacitor C1708 lowers the resonantfrequency of the control winding,to minimize ringing, and diodeY1701 clamps any residual pulses.

The 143 -volt supply is filtered bycapacitors C1702A and C1702Band coil L1702. An interlock, be-tween the bridge rectifier and thefilter, is opened whenever the high -voltage transformer is disconnectedfrom its receptacle. This protectstransistor Q1701 from having 143 -volts applied to its collector throughthe shunt winding of transformerT1704. Resistor R1711 limits cur-rent through the shunt winding, andthe ferrite bead on the emitter leadof Q1701 suppresses a small "hau-sen" at the left side of the screen.

Boost Voltage Regulation(MC Chassis)

Boost voltage regulation isachieved in the MC chassis by se-lecting the correct value of resistorR1628 (82 K -ohm, 2w). Beamelectron flow is through two paths:One is through the anode, the mul-tiplier, the tertiary winding, R1626,all of the screen controls andR1627. The other path is throughthe anode, the multiplier, the clampdiode and R1628. Since the resis-tance of R1628 (82 K ohms) is lessthan the total resistance of the otherelectron path (873 K ohms), mostof the beam current will flowthrough R1628. When the beamcurrent increases, boost voltage in-creases, but the B+ voltage addedto the boost is reduced by the volt -


age drop across R1628 (caused bythe increased beam current), andthe total boost voltage is regulated.

The width of the picture is ad-justed by selecting the proper tapon series -connected coils L1613,L1614, L1615, and L1616. Thesecoils replace width coil L1613 inthe MB chassis.

Because the high -voltage regula-tion circuit causes the width of thepicture to remain constant, the pic-ture height also must be regulated,to maintain the correct aspect ratio.The 23 -volt regulated supply pro-vides a "stiff" regulated currentsource through R730 to the collec-tor of Q702.

Picture TubePicture tube type 25VDCP22 is

used in the MC chassis. It is con-structed of special X-ray absorbentglass "tailored" to the high -voltagecapability of the chassis.

You will find X-ray glass certifi-cation bars molded in the glass onthe funnel and face panel of thepicture tube.

Replace the picture tube only

with a tube of the same type andnumber with the three molded barson the face panel and funnel.

QB CHASSIS

The QB chassis is the next gen-eration of the QA chassis. The QB,like the QA chassis, features all -solid -state circuitry, a HORIZONTALCENTERING control, and 100 -per-cent restoration of the video signal.

Fig. 10-Simplified schematic diagram of thenew high -voltage transformer used in the allchassis. Courtesy of General Electric.

Only the 19 -inch (diagonal) screensize is offered in the QB line.

The picture tube second anodevoltage has been increased to 29.5kv, and is not adjustable. The hori-zontal circuitry remains relativelyunchanged from that in the QAchassis, although there are someminor modifications to the high -voltage transformer. A new windingis added to the high -voltage trans-former (between pins 1 and 2), asshown in Fig. 10. Also, coil L1000and resistor R1001, a network inseries with the yoke, have beeneliminated.

The output of the vertical am-plifier has been increased to meetthe sweep demands made necessaryby the increased high voltage. Thevertical amplifier is directly coupledto the yoke. To increase the currentapplied to the yoke, the voltageswing across the yoke has been in-creased. This is accomplished by in-creasing the B- (to -33 volts)and replacing the vertical -outputtransistor pair with transistors ca-pable of handling the increased volt-age swing.

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Balancing Channels In MATVSystems By James E. Kluge

For consistently good picture quality from channelto channel, the signal levels of individual channelsmust be balanced relative to each other

Complaints about poor picturequality from an MATV system can,in a large number of cases, be at-tributed directly to an unbalancedsignal -level condition somewherein the system. The importance ofbalancing, or equalizing, signal lev-els in multichannel MATV systemscannot be overstressed. Careless-ness and/or lack of concern inestablishing and maintaining a closebalance between channel -to -chan-nel signal levels will, more thanlikely, cost you some rework, call-back time and possible follow-onbusiness.

The Importance of EqualizationEqualizing the signals in a mul-

tichannel MATV system is impor-tant, necessary, easily accomplishedand should not be ignored or in anyway underestimated by the designeror installer.

Balancing signal levels, or equal-izing as it is sometimes called, isessential to good color -TV pictureviewing from an MATV system.

Most MATV systems includeone or more amplifiers somewherein the system. Depending on thesystem size, complexity and thereception area, the system may in-clude antenna preamps, boostercouplers, single -channel AGC am-plifiers, distribution amplifiers, line -extender amplifiers and, finally, theTV set itself.

Types of AttenuationSignal levels in the system will be

attenuated by 1) cable and tiltcompensators as a function of fre-quency, by 2) splitters as a func-tion of splitter loss, by 3) any com-ponent through which the signal

The author is a technical editor forthe Winegard Company

must pass as a function of feedthruloss, and by 4) taps as a functionof isolation loss. Amplifiers in thesystem may have a built-in slopecontrol, or tilt compensator, whichvaries the amplifier gain as a func-tion of frequency.

All of these effects cause widevariations in signal levels fromchannel to channel throughout thesystem (i.e., from antenna to tap).By maintaining relatively close bal-ance at every juncture in the sys-tem, the signal levels will be easierto control and maintain.

Antenna/Headend EqualizationFor best results, initial equaliza-

tion should be accomplished some-where between the antenna and thefirst multichannel or broad -bandamplifier. Typically, equalization isaccomplished at the headend, aheadof any distribution amplifiers. Ifdone properly, from that point ononly tilt compensators should be re-quired.

If antenna preamplifiers are re-quired, try to use single -channelpreamps; otherwise, see to it thatthe signal levels at the preamplifierinput are reasonably uniform (i.e.,within 6 dB).

Many of the amplifiers used inMATV systems have a relativelynarrow range of input levels. Ex-ceeding the maximum input causescross modulation or sync compres-sion, either of which deterioratespicture quality. Too low an inputlevel tends to deteriorate the signal-to-noise ratio and fails to take ad-vantage of the maximum outputcapability designed into the ampli-fier. With unbalanced channel levelsapplied to the input of a broad-band amplifier, one channel couldbe overdriving the amplifier, whileanother channel is well below the

amplifier's maximum input -signal -handling capability.

Keeping the levels of all thechannels balanced ideally to ±1 dBbut at worst to within 6 dB of eachother, particularly at the input ofany amplifiers, will assure fewerproblems, higher efficiency and abetter overall performance from theMATV system.

Antenna

Signals from the antenna mightvary widely depending on the an-tenna gain, orientation, distancefrom the transmitter and receptionconditions (i.e., weather, terrain,or time of day). The "antenna"might consist of 1) several antennasoriented in various directions, 2) asingle broad -band VHF/UHF an-tenna, 3) a stacked array of single -channel antennas or 4) a combina-tion of any of these. In multiple -antenna arrays, some antennasmight require preamps to boostweak signal levels. Strong local sig-nals might have to be attenuated,to bring their levels more into linewith the preamp outputs.

Fig. 1-Ultra-Plex® headend, comprised ofpower panels and strip amplifiers, offers unlim-ited capability to number of channels receivedor TV sets supplied in MATV systems. Signalseparators split both low -band, high -band andUHF signals four ways, for strip -amplifierinputs. VHF/UHF separator coupler combinesVHF and UHF outputs into one 75 -ohm trunkline.


Headend

Some signal balancing at theantenna might be desirable in smallsystems not equipped with a head -end. Where a headend exists, routethe signals from the antennas and/or preamps to the headend location.At the headend, each channelshould be separated and equalizedwith plug-in pads, to bring theirlevels to within ± 1 dB of eachother. Then they can be amplifiedusing single -channel strip amplifiersand then recombined for distribu-tion throughout the system. If prop-erly done, all the signal levels at theoutput of the headend will be with-in ± 1 dB of each other.

DistributionFrom here on, all the signals

travel over a single coaxial cablewhich attenuates the high -frequencychannels more than the low -fre-quency ones. Tilt compensators willadequately correct this type of un-balance. The next amplifier may bea line -extender or it may be thetuner in the TV set. If it's the tunerin the TV (a "single -channel" am-

Fig. 2-Four controller aqua izers equalize individual signals from separate antennas cutfor channels 4, 6, 8 and 13 and combinesthem with signals from channels 2 and 10 offVHF broad -band antenna. The combined signalfed to the booster coupler, after factoring thecoupling losses and insertion losses, consistsof six channels, each at a level of approxi-mately 5000 microvolts, for a total of ap-proximately 30,000 microvolts (30 Only).

plifier), most sets have AGC andaccept a wide range of input -signallevels. However, for good -qualityTV, voltage levels supplied to theset should not be below 0 dBmv(1000 microvolts) or exceed +40dBmv, although many sets canhandle levels as low as -20 dB oras high as +50 dBmv (316 my).

On the other hand, broad -bandamplifiers are not equipped withAGC (unless a pilot carrier is em-ployed). AGC is commonly used intunable or single -channel amplifiers,but in broad -band amplifiers, inwhich more than one channel isamplified, the AGC circuit wouldhave no way of knowing whichchannel it should control. Becauseall channels go off the air fromtime to time, a pilot carrier servesas an AGC reference level.

Line -extender amplifiers fall inthe category of broad -band ampli-fiers, are usually not equipped withAGC and cannot tolerate as muchinput -signal -level variation as am-plifiers equipped with AGC. Inthese applications, it becomes im-perative that all channels be reason-ably balanced. If all channels leav-ing the headend are balanced andAGC'd, then cable loss is the onlysignificant factor contributing tochannel -to -channel unbalance. Byemploying tilt compensators at theline -extender inputs, channel bal-ance is maintained and the distribu-tion system requires no other equal-ization.

Tilt CompensationTilt compensators inserted ahead

of the line -extender input will com-pensate for signal tilt caused bynonlinear cable attenuation (i.e.,higher losses at the higher frequen-cies). Having just the oppositecharacteristic, tilt compensators at-tenuate the low -frequency channelsmore than the high -frequency chan-nels. If the system were initiallyequalized, this restores the balanceto all channels. After each severalhundred feet of coaxial cable, signaltilt should be corrected.

Failure to compensate for tilt re-sults in the low -band levels beingexcessively higher than the high -band levels. Such a condition mightoverload a broad -band amplifier atthe low -band frequencies. Some-times, in an attempt to find a solu-

tion to this problem, uniform at-tenuation (pads) or larger amplifi-er spacings are employed to dropthe level of channel 2 down to theamplifier input -level capability.Neither method provides a positivesolution; instead, the use of pads at-tenuates all channels, including thehigh bands, which are already toolow, and larger amplifier spacingssimply aggravate the signal -tilt situ-ation. Either approach to the prob-lem causes the high -band signals toexit the amplifier at a level well be-low its maximum -output -capabilitylevel. This represents an inefficientuse of line amplifiers plus causeslow average line levels, both ofwhich are detrimental to goodMATV quality and performance.

Antenna EqualizationVariations in channel -to -channel

signal strengths at the antenna aremany and varied. Most problemscan be corrected by proper selec-tion of antennas and application ofpreamps or couplers.

Stacking identical single -channelantennas will increase the capture

It will also narrow the beam width,to reduce fading and ghosts.

Employing an antenna -mountedpreamp can bring a weak, distantchannel up to the levels of localchannels.

Charnel -control couplers permitmultiple antennas to be coupled in-to a single downlead. Any coupledantenna receiving an excessivelystrong local signal can then be pad-ded down to a level comparable tothe others by inserting, in the chan-nel -control coupler, one of eightvalues of plug-in attenuator pads,which range from 0 to 20 dB of at-tenuation.

Headend EqualizationIn cases where equalization at

the antenna is not feasible, it shouldbe accomplished at the headend orat least at a point preceding thefirst broad -band distribution am-plifier. Equalizating at this pointhas the added advantage of beingable to correct for the nonlinear at-tenuation of the coaxial downleadat different TV frequencies. Forlong downloads, tilt compensatorsmight have application.

For example, Winegard offers


MATV designers three choices ofmethods to equalize signals aheadof the distribution amplifier(s).Each method allows you the flexi-bility to choose the exact value ofattenuation for each channel re-ceived after the equipment has been

jaw

Fig. 3-Mixer equalizers are used to balancethe levels of signals from two differentlyoriented VHF antennas. One mixer equalizer(ME -26) is factory tuned for channels 7, 9, 11and 13. ME -26's, hooked up back-to-back, pro-vide the necessary 20 dB -plus attenuation re-quired. All high -band channels require lessthan 20 dB attenuation, so signal separator(EISX-SP) is used to provide four outputs toME -713. Hi/lo-band separators (F-175) splitthe two bands and then recombine them forequalization of channels.

specified and installed. By selectingone of eight values of plug-in at-tenuators, signal levels can be bal-anced to a closely predeterminedvalue.

Ultra-Plex® PanelsUltra-Plex®, one of the three

Winegard methods, is a solid-state,82 -channel, modular, plug-in dis-tribution system. It gives the install-er flexibility and complete signalcontrol. Signal equalization is ac-complished by inserting attenuatorpads into the single -channel or

Fig. 4-Channel-control coupler attaches toantenna boom or mast and couples the signalfrom any single -channel VHF Yagi antenna toanother VHF -FM antenna. Plug-in pads at-tenuate signal from one coupled antenna, tobalance it with level of signal from theother. All signals are combined at the outputand fed to a single coaxial downlead.

Fig. 5-VHF/FM cartridge traps at the antenna may be used to attenuate, by 15 dB, any VHFchannel or FM station, to better balance signal levels at the antenna. A) Cartridge trap partiallyremoved. B) Cartridge trap in operating configuration.

broad -band strip amplifiers (Fig.1). Using single -channel amplifiers,any individual channel may be at-tenuated in eight steps, from 0 to20 dB, by inserting the appropriatepad.

Ultra-Plex® consists of a powerpanel with provision for plugging inone to four single -channel strip am-plifiers (or broad -band amplifiersor converters). Input to each stripamplifier provides for a plug-in at-tenuator pad, making signal balanc-ing simple. Unless single -channelantennas are employed with indi-vidual downleads, a four-way signalseparator, mounted on the powerpanel, splits the multichannel signalfrom the single antenna downleadand feeds it to each strip amplifierinput. Because they are single -channel amplifiers, they will onlyaccept the channel to which theyare tuned (and part of the adjacent -channel bandpass), excluding allothers. Their outputs are combinedin the power panel and madeavailable at the output jack. Formonitoring purposes, the combinedoutputs are attenuated 40 dB andmade available at a monitor jack.A booster panel, in a similar con-figuration, will accommodate fourplug-in, non-AGC strip amplifiers,to provide, when needed, single -channel preamplification ahead ofUltra-Plex'-,' power panels. Strip -ampoutputs on booster panels are notcombined; they are jumpered di-rectly into the power panel. Addi-tional power panels, coupled to-gether, will accommodate as manychannels as are available.

Controller EqualizersA second method of equalizing

signals employs controller equali-zers (CE's). CE's accept two in-puts, one of which must be a singleTV channel to which the unit isfactory pretuned (Fig. 2). The levelof this single channel can be con-trolled within the range of 0 to 20dB attenuation by one of eightplug-in attenuator pads. The cou-pling input, because there is no pro-vision to attenuate it, should be theweaker signal of the two and maycome from another cut -to -channelantenna or a broad -band antenna.After padding down the level of thestronger signal to the level of the

continued on page 57


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And you can assure your customers thatthe antenna, amplifier and rotary mechanism areall safely enclosed in a tough, durable radome.So the Mini -State Antenna will take whatever theweather happens to send its way and still go onworking perfectly for years to come.

The RCA Mini -State's uni-directional pattern,VHF slotted ring, multi -element UHF design, andcompletely integrated solid state circuitryprovide excellent reception on all channels up to35 miles from TV transmitters.

Mini -State model 5MS440,with built-in rotator,allows your customers tozero -in for best receptionwhile the exclusivedirection indicator lighton the hand-held controlunit tells them where theantenna is aimed. Sixty -

feet of unique cable combining co -ax and rotatorlines is provided in each kit; longer and shorterlengths are optionally available, or standardco -ax and rotor cable can be used.

The entire unit measures just 21" across and7" high and weighs only 6 pounds. Simple, quick,one-man installation saves time and labor.

For more information, see your RCA Partsand Accessories distributor today, or contactRCA Parts and Accessories, P.O. Box 100,Deptford, N.J.

RCAMINI -STATETV Antenna System


Electronic SecuritySystems -A Natural For

Electronic ServicersBy Charles Eisenhardt

Intimate, in -home contact with

consumers plus his recognized

expertise in electronics make the

servicer a natural marketer and

installer of consumer electronic

security systems

Crime in the UnitedStates has become a sta-tistician's dream cometrue, and if you like sta-tistics, you'll love crime.A burglary is committedevery 13 seconds in theUnited States, and in1973, nearly 21/2 millionhomes and businesseswere victims.

Throughout 1973 andto date in 1974, the de-mand for security and theprotection of both citizensand property has been ex-panding beyond the com-mercial category and isbecoming an importantconsumer product.

This is not to say, how-ever, that you can hangan electronic securityproduct on a rack and ex-pect the consumer to buyit like a set of headphones or a new TV set.Security and protectionare negative thoughts totypical consumers, andthey are not stimulated ormotivated by the thought

of protection like they areby a new appliance, auto-mobile, or fur coat.

Electronic securityequipment is somethingthat must be sold, andsold by someone in whomthe consumer has confi-dence. Enter the electron-ic service dealer.

Because the homeown-er and businessman todayis thinking security andaccepting it as a fact oflife, the opportunity is athand for you to expandyour business into theelectronic security field.

Many service dealershave responded to thechallenge and have takenthe time to familiarizethemselves with basicelectronic security sys-tems and components andtheir installation.

The principal problemencountered by servicedealers is that they havehad to purchase directlyfrom one or more of theseveral leading manu-facturers of electronicsecurity equipment on atrial and error basis, andcould find no advice orassistance available tothem locally. Undoubted-ly, many electronic deal-ers who did not have thetime or the willingness to"learn" the electronic se-curity business simplyabandoned the idea as"something better off leftto the specialists."

INSTALLATIONINFORMATION

Throughout 1973, how-ever, progress was madein making installation in-formation and alarmequipment more readilyavailable to the electronicservice dealer by encour-aging the electronic whole-sale distributor to acceptsecurity equipment as alogical addition to his

stock and inventory.Distributor participation

has not been nationwideby any means, so if youdo not recall seeing se-curity equipment at yourlocal distributor, it's nosurprise. Some distribu-tors have tried stocking afew alarm componentswhich they felt were rep-resentative of all securityequipment, and as such,would provide the techni-cian with "enough" formost jobs. This is not arealistic approach, andcan be compared tostocking a single type ofreplacement tube, TV an-tenna, or stereo speaker.Other distributors handlea single brand of securityequipment, which is avariation of the compo-nent idea except that allof the accessory compo-nents are designed for usewith the basic alarm con-trol, and must be pur-chased separately. If onepart is out of stock, thesystem cannot be complet-ed. Here, once again, theequipment in question isdesigned for an "average"situation, with the resultthat the installation mightbe more or less than thatactually required.

A third type of distrib-utor approach to elec-tronic security is the se-ries of do-it-yourself typeitems packaged in see-through packs, which aredesigned to stimulate im-pulse response at the con-sumer level. Such displaysalso are found in hard-ware stores, home im-provement centers anddo-it-yourself departmentsof major retailers.

The electronic servicedealer, being a profes-sional in his own trade,should, of course, contin-ue to associate himselfwith professional equip -

The author is vice president of PLC Electronics Inc.

36I ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

Shown here is an example of afor use In small businesses andin the package. B) Illustration oftern, which provides both space

ment in all facets of hisbusiness, including thesale and installation of se-curity equipment.

EQUIPMENTIn the latter part of

1973, many electronicdistributors came to real-ize that there was a grow-ing demand for securityequipment and a desireon the part of more andmore electronic dealers toobtain information on theinstallation of alarmequipment. Among thequestions in need of an-swers then, and now, are: What type of equip-

ment should be used? Is there a difference

between residential andcommercial security?

How much does goodequipment cost?

How long will it taketo complete the instal-lation?

How much should Icharge for the instal-lation?

packaged electronic security systemresidences. A) Components includedthe intended application of the sys-

and perimeter security.

Will I need specialtools?If these are questions

you would like to haveanswered, the chances areyour local wholesale dis-tributor can be of someassistance, if he is an au-thorized distributor for atotal packaged protectionsystem product line.

In such a line, a seriesof basic but varied alarmsystems are prepackagedfor the electronic dealer.A typical system includes: Alarm control cabinet Tamperproof indoor/

outdoor bell Alarm circuit wire

(minimum 500 feet) Indoor horn for fire Standby battery Magnetic sensors, for

doors and windows Panic/emergency

buttons Remote -controlled

on/off stations Time -delay trip light Heat sensors, for fire

detection

Low -voltage, plug-inpower supply

Mounting hardware Warning decals Full one-year warranty Complete step-by-step

instructions.Complete, electronic

security packaged systemswhich include all of thecomponents needed foran installation are nowavailable from manywholesale distributors.The electronic servicedealer should familiarizehimself with them.

EstimatingManufacturers of these

professional, packagedsecurity systems also of-fer detailed literature sug-gesting methods of esti-mating the cost of theinstallation as well as theapproximate installationtime for a complete sys-tem. While bidding is nota normal requirement formost electronic securityjobs, the service dealerusually is better off fol-lowing the suggestions andguidelines for pricing out-lined by the manufacturer.

Space vs. PerimeterTypes

Security equipment isdesigned to detect unau-thorized entry. Certaintypes of equipment suchas microwave, ultrasonicand sound detection,among others, are cate-gorized as space detect-ors, because they detectmovement within the pro-tected area.

The most basic type ofalarm security protectionis that called perimeterprotection, or the physicalwiring of each door orwindow to detect andwarn of any attempt atforced entry, while it isstill in progress. This typeof system is also availablein a wireless version,

which uses small radiocontrols that are mountedat or near each door andwindow. These transmita signal to a receiver unitcentrally located withinthe protected premises.As with all types of alarmsystems, it's only the endresult that counts. Somerequirements can be sat-isfied by the ringing of abell just outside the build-ing, while others mightrequire greater alarmnoise, such as sirens, oreven flashing lights. Adirect connection to aneighbor or the authori-ties is also important insecurity, and one way thiscan be accomplished iswith an automatic emer-gency telephone dialer.

Automatic EmergencyTelephone Dialer

For years, the onlydirect connection to thepolice or fire departmentfrom the protected prem-ises was through a leasedtelephone line. The leasedline is generally connectedto a central station boardwhich is monitored 24hours a day, and thecustomer pays a mileagecharge for the telephoneline in addition to themonthly charge for thealarm system. This formof protection is costly andthe installation can be de-layed for several monthsbecause of the continuingshortage of telephonelines. The automaticemergency telephone dial-er is an inexpensive alter-native to the leased line,and the electronic techni-cian can easily add sucha device to any alarm in-stallation by following themanufacturer's installationinstructions.

IS THIS FOR YOU?Of course we recognize

the fact that many elec-


tronic dealers are un-familiar with the installa-tion of electronic securityequipment because theyare busy with their regu-lar business, or possiblybecause they feel thatalarm installations aretricky and should behandled by specialists.

If the reader is in thefirst category and is un-able to undertake addi-tional work, it is suggest-ed that security installa-tions be considered as apossible hedge againstbusiness slow downs andmarket fluctuations causedby spending cutbacks or

The Electronic Security Profit PictureThe profit an electronic servicer or dealer can realize fromthe sale and installation of two typical packaged electronicsecurity systems is computed below, using actual costs andtypical installation times.

PLC Sugg.Model Retail Install. Servicer's Servicer'sNumber Price Chrg. Unit Cost Profit740* $269.99 + 2 Hrs. - $175.00 = $124.99

@ $15/Hr.610** $269.95 + 51/2 Hrs. - $176.40 = $176.05

@ $15/Hr.*Model 740 is an AC/DC ultrasonic security system whichoffers a combination of space and perimeter security forsmall businesses, offices or residences**Model 610 is a more sophisticated AC/DC commercialsecurity system for space and/or perimeter security oflarger businesses and offices.

WINEGARD AMPLIFIEDPRODUCTS PROVEN IN OVER1,000,000 INSTALLATIONS.

CASE IN POINT: WINEGARDDISTRIBUTION AM LIFIERS.

For quality and dependability in distribution amplifiers,look to Winegard. You know they're good. Because ourdistribution amplifiers have specs you can count on andthe best reliability in the industry today.When you install an MATV system you want it to workright ... and keep on working that way. You want aheadend amplifier that won't give you headaches. Nomatter what size systems you install Winegard offers themost trouble -free circuitry around ... and at the mostreasonable cost around.On your next commercial system start out with aWinegard distribution amplifier. There's a model justright for every size and type of installation. We invitecomparison!

Best TV products for Best TV reception

%%VWINEGIARDTELEVISION SYSTEMS

Wmegar,t Nood Street Burlington Iowa 52601



improved products thatmight cut down on ser-vice in the future.

Because the electronicdealer is an establishedbusinessman in the com-munity, he can easily ex-pand his business and in-come without appreciablychanging his organizationor overhead. If for ex-ample, when the dealer isinvolved in a new TV in-stallation, service call orantenna replacement, heprobably can sell and in-stall a modest electronicsecurity system in thesame home, and usuallyin the same work day,and generate $300 to$500 additional incomewhile doing so. This typeof business expansion ispractical and profitablebecause security is rapid-ly becoming a consumerproduct, and the buyingpublic is demonstrating itswillingness to purchasereasonably priced, de-pendable security systemsfrom someone they knowand trust. That someoneis you, the electronic ser-vice dealer.

If you feel that securityinstallations are "tricky"and should be handledonly by specialists, takethe time to acquaint your-self with the professionalpackaged security systemswhich are now availableat many wholesale elec-tronic distributors. Ex-pertly designed and il-lustrated installation in-structions are also avail-able from the manufac-turers of such equipment,and they are included withthe complete packagedsystems. They give step-by-step instructions forinstalling the complete in-stallation. Because oftheir experience with wir-ing and circuits, mosttechnicians are quite ca-pable of installing most

types of electronic securi-ty equipment presentlyavailable, without gettinginto really sophisticatedapplications. The all-im-portant key is the qualityand depth of the installa-tion instructions suppliedby the manufacturer, andthe electronic dealershould investigate thispoint through his whole-saler before he decides topurchase a specific brandor type.

SALES AIDSA final area of impor-

tance that is of interest tothe service dealer is salesliterature. Several manu-facturers of securityequipment make instruc-tional or informative liter-ature available to dealers,for distribution at theconsumer level. The deal-er should avail himself ofsuch material (particu-larly if it is free) and useit to announce to past andpresent customers that hecan supply them withprofessional securityequipment, installed atreasonable prices, in addi-tion to his normal elec-tronic services. Somemanufacturers also sellinexpensive sales demon-stration aids that actuallyshow the function andoperation of a completesystem.

Security is a naturalcomplement to your ex-isting electronic business,and the time is right foryou to investigate this in-dustry at your local elec-tronic distributor. And,he probably has the pack-aged system in stock thatis ideal for your ownhome or business. Thereis no better way for youto get some actual instal-lation experience than bychoosing and installing anelectronic security systemfor yourself.

while the guy down the streetcomplains about how toughalignments are...I do them!

AraMOOEL 41S SOLO STATE SWEEP/MARKER GENERATOR

AO41.17.

AO

11.0 AO 11201 MAO

7- we-7"

10 0:100110

I used to hook up a separate sweep generator, markergenerator, marker adder and bias supply, hope thateverything was properly calibrated and adjusted, andpray that the alignment would hold after I discon-nected the cables draped all over the bench.

I didn't do it very often.Now, in the time it used to take me just to set up, I

can almost complete an alignment. And I'm confidentthe set will perform as well as it possibly can. My cus-tomers notice, too. That's the difference B&K's 415Solid -State Sweep/Marker Generator made.

Setup is no problem. After I connect the 415's out-puts to my scope (there's even low -frequency com-pensation to eliminate pattern errors), I connect its RFoutputs (channel 4 or 10) to the antenna terminals ormixer test point, the direct probe to the video detectortest point (or anywhere else after the video detectordiode) and the demodulator probe to the bandpassamplifier output.

They're all clip -on connections, and the 415 comeswith all the accessories I need. Once I've made theinitial signal and bias hookups, there's nothing else toconnect or reconnect. All intercabling changes andgenerator functions are controlled from the front panel.There's even a 15,750Hz filter to eliminate disabling

PRODUCTS OF

. ,

MOWN

MOO

-"7"

IN

ANON

r- MOMOO

DYNASC,4N

W reC"

r

-7"-

10 SOOIMIA

1111

ACTONAO .1

Olt

OM IMAM.. .000.

1111.

Model 415$459

the set's horizontal output section.Shaping the waveform is easy, because the 415 has

10 crystal -controlled IF markers, each of which lightsup on the front -panel waveform diagram as it is used.Markers can be shown either vertically or horizontallyon the scope trace. There's a 100kHz modulated mark-er that makes nulling the traps so easy it's almostautomatic. And three low -impedance, reversible -polarity bias supplies-two, 0-25VDC; one, 0-50VDC.

Vertical Markers Markers Tilted Horizontally

Every step is easy to understand, too, thanks to thecomprehensive manual.

Since I have nothing to sell but my time, I have tomake the most profitable use of it I can. That's why Ihave a B&K 415.

In stock now at your local distributor or writeDynascan.

1801 i A ' cago, IL 60613 Phone (312) 327.7270Complete Line of Analog and Digital Multimeters, Oscilloscopes, Signal Generators,Semiconductor Testers, Power Supplies, Probes, Tube Testers and Substitution Boxes.


OCTOBER 1974, ELECTRONIC TECHNICIAN/DEALERI 39

TESTINSTRUMENTREPORT

Measuring DCBeta withthe HeathkitModelIT -121 FET/TransistorTester By J. W. Phipps

Beta and Its Relationshipto Alpha

Bipolar transistors are current -operated devices. Their ability toprovide current, voltage or poweramplification is dependent on thedegree to which current in their in-put element can control current intheir output element. This ability iscalled forward current transferratio and is referred to as alpha ifthe transistor is connected in a com-mon -base configuration (Fig. 1)and beta if the transistor is con-nected in a common -emitter con-figuration (Fig. 2).

Alpha and beta both are mea-sures of the forward current trans-fer ratio (current gain) of a bipolartransistor and are mathematicallyrelated. Therefore, if the alpha ofa transistor is known, the currentgain in terms of beta can be com-puted, and vice versa. Both terms,alpha and beta, are the ratio of in-put current to output current. Theprincipal difference between thetwo terms is the input element thatis used in computing the ratio of in-put and output currents.

Alpha is determined with thetransistor connected in the com-mon -base configuration, as shownin Fig. 1. The input element in thisconfiguration is the emitter, and theoutput element is the collector. Theformula for computing DC alpha isIc/Ie. The DC alpha for the tran-

sistor in Fig. 1 is .98mA divided by1 mA, or .98. (In the common -basecircuit, current gain is always lessthan 1.)

If the same transistor is connect-ed in the common -emitter configu-ration in Fig. 2, as it is for betameasurement, the input element isthe base, and the output element isthe collector. The formula for com-puting DC beta is Ic/Is. The betaof the transistor in Fig. 2 is .98 mAdivided by .02mA, or 49.

To convert the alpha measure-ment to beta, the following formulais used:

Alphabeta = 1 - alpha

Converting the alpha of the tran-sistor in Fig. 1 to beta, we find thatit is:

.98beta = 1 - .98 = 49

To convert beta to alpha, the fol-lowing formula is used:

betaAlpha = 1 + beta

Converting the beta of the tran-sistor in Fig. 2 to alpha, we findthat it is:

49Alpha = 1 + 49 = .98

These computations show thatthe alpha and beta of a transistorare mathematically related.The Preference for BetaOver Alpha

Al though alpha and beta are

Heathkit Model IT -121FET/Transistor Tester. For

more information, circle 900 onthe Reader Service Card.

mathematically related and mea-surement of either one provides es-sentially the same evaluation of thecurrent gain characteristics of atransistor, beta is the transistor gaincharacteristic measured by mostservice -type transistor beta testers.The principal reason for this is thatchanges in transistor characteristics,such as junction leakage, which af-fect the current gain capabilities ofthe transistor, produce larger nu-merical variances of beta than ofalpha. Consequently, changes ofcurrent gain capabilities are easierto measure and display on meters interms of beta than they are interms of alpha, even though suchchanges usually affect both termsequally. Also, most transistor man-uals specify current gain in terms ofeither AC (I -I,.) or DC (HFE)beta. (AC beta is computed usingthe same ratio of input (base) andoutput (collector) currents exceptthat the base current is varied be-tween two current levels represent-ing the extremes produced by anAC signal. The small change in col-lector current this produces is thendivided by the small change in basecurrent that produced it.)

"Normal" Beta

The principal purpose of measur-ing the beta of a transistor duringtroubleshooting is to determinewhether or not the transistor is ca-


Fig. 1-Transistor connected in common -

base circuit.

Fig. 2-Transistor connected in common -

emitter circuit.

CL ASS APPLICATION CURRENTCAPABILITY

SIGNAL AUDIO,RF. IF

1 mA - 10 mA

INTERMEDIATEPOWER

AUDIO,SWITCHING

10 mA- 100 mA

POWER AUDIO,REGULATOR,OUTPUT

100mA -1A

Fig. 3-Three principal classes of bipolartransistors and ranges of collector currentat which they typically are operated.

pable of producing the current gain(and therefore power and/or volt-age gain) required for the applica-tion in which it is used.

The beta of a number of prop-erly operating transistors of thesame type can vary over a widerange. During the design of a cir-cuit, the "design center" beta ofthe type of transistor to be used isselected as the beta around whichthe circuit will be designed, and the"normal" beta values above and be-low the design center are compen-sated for by building in additionalcomponents which stabilize theoperating point of the circuitthroughout the wide range of betavalues of the type of transistor thatwill be installed in the circuit duringmanufacturing or servicing.

Because the "normal" beta ofproperly operating transistors of thesame type is usually a relativelywide range instead of a specificvalue, beta usually should be evalu-ated in terms of the minimum valuespecified for that type in transistormanuals. (One exception to thisrule is when transistors of the same

CURRENTRANGE

CALIBRATIONSETTING

COLLECTORCURRENT

BETAMULTIPLICATIONFACTOR

BETA MULTIPLICATIONFACTOR AFTER SWITCHINGTO NEXT LOWER CURRENTRANGE

100 IA Not Used

1 mA CAL X1CAL X5CAL X10

1 mA5 mA

1 mA

X1

X5X10

NOT AVAILABLENOT AVAILABLENOT AVAILABLE

10 mA CAL X1CAL X5CAL X10

1 mA5 mA10 mA

X1

X5X10

X10X50X100

CAL X1CAL X5CAL X10

10 mA50 mA10C mA

X1

X5X10

X10X50X100

CAL X1CAL X5CAL X10

1 A

5 A1 A 1

X10X50X100

Fig. 4-Chart of collector current ranges provided by 1hathkit Model IT -121 FET/Transistor

Tester. Current range is selected by pushing in corresponding pushbutton of RANGE selector.

BETA CAL control is adjusted to place meter needle over calibration setting corresponding tocollector current level desired. When BETA button of FUNCTION selector is pushed in, beta isvalue indicated by beta scale of meter multiplied by corresponding multiplication factor. If

meter needle reflects off scale, next lower current range is selected and the correspondinghigher multiplication factor is used.

type must be matched for use incomplementary symmetry circuits,etc.) If the beta of a transistormeets the "minimum beta" specifi-cation for its type, it usually can beconsidered to be capable of per-forming its intended circuit func-tion, if its other characteristics, suchas junction leakages, are withinnormal limits.

If the transistor does not produceat least the minimum beta specifiedfor its type, or if the tester beingused to measure its beta cannot becalibrated while it is connected tothe tester, the transistor probably isdefective. However, if the transistorhas been tested only in -circuit, re-move it and test it out -of -circuit be-fore discarding it. A defect in thecircuit might be causing the abnor-mal tester indication or the lowbeta reading.

Performing Beta Testswith the Heathkit 11-121

For an accurate evaluation of thecurrent gain characteristics of atransistor in relation to its type andapplication, the beta test should bemade with the transistor collectorcurrent as near as possible to thelevel it is in the application in whichthe transistor is used. Fig. 3 showsthe three principal classes of bipolartransistors and the ranges of col-lector current at which they typical-ly are operated. The collector cur-

rent levels provided by the ModelIT -121, shown in the chart in Fig.4, cover the range from .1mA to1A. The appropriate current rangeis selected by pushing in one of fiveRANGE pushbuttons.

For in -circuit testing, the tran-sistor elements are connected viatest leads to corresponding jacks onthe top center of the front panel.For out -of -circuit testing, the tran-sistor is plugged into a socket onthe top right of the front panel.

To setup the Model IT -121 forbeta measurement, the TRANS

pushbutton of the MODE selectorand the BETA = INFINITY pushbut-ton of the FUNCTION selector arepushed in and the NPN/PNP push-button of the MODE selector is eith-er pushed in (for PNP) or released(for NPN). This establishes thecircuit in Fig. 5A, which actuallyis a bridge configuration, as shownin Fig. 5B. Rt in Fig. 3B representsload resistor R8 and any in -circuitshunt resistances (indicated by Rxin Fig. 3A). The principal purposeof this circuit is to balance outshunt resistances and leakage cur-rents when the transistor is testedin -circuit, and to balance out leak-age currents during out -of -circuittesting. This is accomplished by ad-justing RI I, the SET BETA INFINITYcontrol, so that the meter needle isplaced over the BETA INFINITYmark on the beta scale. (Fig. 6).


With the meter needle at this point,the opposing currents in the twolegs of the bridge are equal andcancel out each other. Consequent-ly, no current flows through themeter. Any subsequent unbalanc-ing of the bridge, as indicated bymovement of the meter needle, willbe related only to actual collectorcurrent. If, during this setup proce-dure, the meter needle cannot beplaced over the BETA INFINITY me-ter mark, either the transistor is de-fective, the NPN/PNP pushbutton isin the wrong position or, if the tran-sistor is being tested in -circuit, acircuit defect exists.

Resistors R1 through R4 in Fig.5A are meter shunt resistors whichchange the sensitivity of the meterto correspond to the collector cur-rent range selected.

After the bridge has been bal-anced to cancel out the effects ofin -circuit resistances and any leak-age inherent in the transistor, theBETA CAL pushbutton of the FUNC-TION selector is pressed in, con-necting the base of the transistor in-to the test circuit, as shown in Fig.

the BETACAL control on the front panel, ad-justs the emitter -base current of thetransistor and, consequently, thetransistor collector current. R12 is

adjusted to produce sufficient cur-rent flow through the meter to placethe meter needle over the X10, X5,or X5 meter calibration mark, de-pending on which collector currentrange and level have been selected.(Refer again to the chart in Fig. 4.)For example, if a collector currentlevel of 10mA is desired, the 10mApushbutton of the RANGE selectorwill have been pushed in and theBETA CAL control will be adjustedto place the meter needle on theCAL X 10 mark. The level of currentflowing in the collector at this meterindication is 10mA.

Next, the BETA pushbutton ofthe FUNCTION selector is pushed in,establishing the circuit shown inFig. 8. It is identical to that in Fig.7 except that RIO and the meterare interchanged. This does not af-fect the transistor operating condi-tions established previously, be-cause the resistance of the meterand RIO are identical (1500ohms). However, note that theshunt resistance across the meterwhen it is in the base circuit is tentimes larger than the shunt for thecorresponding current range whenthe meter was in the collector cir-cuit. This increases the meter sen-sitivity by a factor of 10, so thatthe current required for full-scale

Fig. 5-BETA=INFINITY circuit of Model IT -121. A) Actual circuit. B) Equivalent circuit showsthat circuit actually is a bridge configuration.

I. 100,. 10r, Ir.

0+1'.

IA81

I SV

Fig. 7-BETA CAL circuit of Model 1T-121.

deflection of the meter in the basecircuit is only 1/10th of what it wasin the collector circuit. One reasonfor this consistent difference of me-ter sensitivity between collector andbase is that the base current of atransistor is inherently much small-er than the collector current and,therefore, requires a more sensitivemeter for readable indications.And, if the meter is to be calibratedto read beta directly, as is the me-ter of the IT -121, the factor bywhich the meter sensitivity differsbetween base and collector readingsmust be consistent for each currentrange and must relate to the multi-plication factor of the currentranges, which for the IT -121 is 10.(Note that the current ranges of theIT -121 shown in Fig. 4 differ by afactor of 10.)

As an example of how the IT-121 meter scale reads out beta di-rectly, suppose that the beta of asmall -signal audio transistor is be-ing measured at a collector currentlevel of lmA. The lmA pushbuttonof the RANGE selector is pushed in

rho

Fig. 6-Meter of Model IT -121. Top scale isdirect -reading scale, with corresponding col-lector current/beta multiplication indicatorsbelow it. Middle scale is FET direct -readingtransconductance scale, calibrated in mi-cromhos. Bottom scale is for direct measure-ment of leakage currents.

r

Z. 44 3

Fig. 8-BETA circuit of Model IT -121. This circuit is same as that inFig. 7 except that the meter and R10 have been interchanged so thatmeter now is in base circuit.


and the BETA CAL control is adjust-ed to place the meter needle overthe CAL X 10 mark (Fig. 4). Thecurrent now flowing in the collec-tor circuit is lmA. The meter isthen switched to the base circuit bypressing in the BETA button of theFUNCTION selector. Suppose themeter needle swings to the 1 (full-scale) position on the beta scale(Fig. 4). Because the meter sensi-tivity is now 10 times greater thanit was in the collector circuit, theindication represents .1mA of cur-rent flowing in the base circuit.Since beta equals Ic/In, the betaof the transistor is lmA/.1mA, or10. The beta scale reading verifiesthis (meter reading of 1 multipliedby the calibration factor of 10 =10).

HEATHKIT MODEL IT -121FET/TRANSISTOR TESTER

SpecificationsMEASUREMENTS

Bipolar Transistor DC Beta-Di-rect reading, in or out of circuit, from1 to 5000 in five ranges, at collectorcurrents from .1mA to lA in fourranges; out of circuit accuracy of±5%.

Bipolar Transistor Leakage-Iceo,Ices, Icbo; direct reading, out of cir-cuit, in five current ranges (0-100mA,0-1mA, 0-10mA, 0-100mA, 0-1A);±5% accuracy.

FET Transconductance (Gin)-Di-rect reading in or out of circuit, from0 to 50,000 micromhos.

FET Leakage-Idss, Igss; directreading, out of circuit, in five cur-rent ranges (0-100mA, 0-1mA, 0-10mA, 0-100mA, 0-1A); ±5% ac-curacy.

Diode Tests-Forward and reverseleakage currents; direct reading, outof circuit, in five ranges (0-100mA,0-1mA, 0-10mA, 0-100mA, 0-1A);±5% accuracy.

Unijunction Transistor Test-leB2s and 182es leakage currents plusIB2BIs forward current; out of cir-cuit.

SCR and Triac Tests-Proper con-duction and blocking, in or out ofcircuit.POWER SOURCE

Two 1.5 -volt D cellsDIMENSIONS

9-9/16 inches wide X 8-5/8 inchesdeep X 5-1/4 inches highWEIGHT (Less Batteries)

3 1/2 lbs.PRICE (Kit form only)

$59.95

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(Ask for FREE vest pocket Cross Reference booklet No. X61

WOR KMANSubsidiary of IPM TECHNOLOGY INC.

BOX 3828 SARASOTA. FLA. 33578PRODUCTS, INC.

... for more details circle 136 on Reacer Service Card

OCTOBER 1974. ELECTRONIC TECHNICIAN/DEALER 43

TECHNICALLITERATURE

CATV/MATV Cable

A 20 -page single -source selectionand application guide, No. ED74-2,for CATV/MATV coaxial cable isnow available. It covers the full prod-uct line and provides technical refer-ence data on shielding methods andefficiency evaluation. The booklet pre-sents complete physical and electricalcharacteristics of more than 50 stan-dard Belden CATV/MATV cables.The easy -to -read tabular format of thecatalog section divides the product lineinto RG-59/U type, RG-6/U type,and special application classifications.Highlighted are cable constructionsutilizing Duobond-an overlappingaluminum foil tape bonded by a spe-cial process directly to the insulationcore for simplified termination. BeldenCorp., Advertising Dept., 2000 S.Batavia Ave., Geneva, Ill. 60134.

Electronic ComponentsThe 1974-75 edition of the IRC

Commercial Products catalog is nowavailable. Four new product lines arelisted in the 30 -page catalog: Japa-nese "original equipment" transistors,for use in replacing Japanese televi-sion and audio equipment parts; high-turnover electrolytic capacitors, withworking voltages from 12 to 50volts; four new, matched -pair transis-tors, to expand replacement capabili-ty; and lighted rocker switches inSPDT and DPDT versions. Alsolisted are different types of rectifiers,semiconductors, and diodes as well ascolor TV components and hardwarefor hobbyists. The brochure showscomplete specifications, line drawings,photographs, and price informationfor the home entertainment electronicequipment. Commercial Products Division,International Rectifier Corp., 233 KansasStreet, El Segundo, Ca. 90245.

TV Repair ManualA 47 -page Symptom Repair Manu-

al has been distributed to GE tech-nical publications subscribers by Gen-eral Electric's Product Service Dept.The manual is step one of the newthree-part STC Program, which isdesigned to help service techniciansquickly identify most causes of GEtelevision breakdowns. It lists avariety of symptoms for individualGE TV chassis and outlines what tocheck, and in what order. The symp-toms and repairs were developedfrom computerized data supplied from

actual service technician repair in-voices. The manual will be updatedperiodically to maintain its timelinessas a service tool. Free to subscribersof GE Technical Data, the manual isoffered to every non -subscribing tech-nician for $1.00. General Electric Co.,Television Products Service, CollegeBoulevard, Portsmouth, Va. 23705.

Soldering Tools and AccessoriesA 12 -page catalog, No. 5711, covers

a complete line of soldering tools andaccessories. Excelite-Weller Div. of TheCooper Group, P.O. Box 728, Apex,N.C. 27502.

Test EquipmentA 16 -page catalog, No. 60-T, covers

test equipment. The catalog also in-cludes a handy chart to help you selectthe Triplett VOM for your needs.Triplett Corp., Bluffton, Ohio 45817.

TransformersA new transformer catalog, No.

407, lists 1,600 standard transformers.It also includes full technical data,mounting dimensions, photographs andother specifications of the completeline of audio transformers, powertransformers, chokes and inductors.Essex International, Inc., Controls Divi-sion, Stancor Products, 3501 W. Addi-son Street, Chicago, III. 60618.

Picture TubesAn illustrated four-color brochure

describing its television picture tubemanufacturing capabilities is nowavailable. Called "The Making of #1,"it contains 29 pages of background in-formation on the division and illustrat-ed highlights of color television picturetube production. Free copies of thebrochure are available from GTE Syl-vania distributors.

Electronic Test AccessoriesA 68 -page catalog of electronic test

accessories contains more than 500products, 17 of which are new. It pro-vides illustrations and complete en-gineering information on all products,including dimension drawings, sche-matics, specifications, features andoperating ranges. Pomona Electronics Di-vision of ITT, 1500 East Ninth Street,Pomona, Ca. 91766.

VHF/UHF/FM Tuner ReplacementGuide

A new parts catalog, the 1974-75VHF/UHF/FM Tuner ReplacementGuide and Parts Catalog, No. 4, is

now available. It illustrates thousandsof parts for all kinds of tuners, inaddition to "blow-up" photos of many.A complete line of PTS test equip-ment, tools and chemicals are also in-troduced. The catalog is availablefrom all PTS locations for a cost of$2.00 (refundable on first order forgoods or services). PTS Electronics, Inc.,P.O. Box 272, 5233 Hwy. 37 S.Bloomington, Ind. 47401.

CapacitorsTwo, 2 -page flyers detailing twelve

different capacitor kits are now avail-able. Specific types of capacitors in-cluded in the kits are axial and radial-lead, low -voltage, miniature aluminumelectrolytics, and low- and high -volt-age, polyester film, plus polypropylenefilm. Quantities of capacitors in thekits range from as few as 25, in acompartmentalized plastic container,to as many as 200, in a fourteen draw-er metal cabinet. International Compo-nents Corp., 10 Daniel Street, Farming-dale, N.Y. 11735.

MATV Systems EquipmentA catalog covering systems equip-

ment which also serves as a referenceguide to instruct the beginner. It con-tains useful reference charts, data, andtypical systems diagrams. Everythingthat goes into the make-up of aMATV system is illustrated and ex-plained in the simplest terminology.The catalog also contains a quantity ofplanning sheets for laying out systemsand work order forms for estimatinginstallations. RMS Electronics, Inc., 50Antin Place, Bronx, N.Y. 10462.

Digital MegohmmeterA 4 -page data sheet, No. 3J106B,

contains specifications and orderinginformation for a new digital meg-ohmmeter and accessories. The in-strument provides measurement capa-bility from 2.0 to 2,000 megohms,with a test voltage of 500 volts DC.ITT Jennings, 970 McLaughlin Ave.,San Jose, Ca. 95116.

Two -Way CommunicationProducts

A four-color, full -line catalog liststhe SBE line of consumer and profes-sional two-way communications prod-ucts. An important feature of the cat-alog is the introduction of a newsystem of transceiver evaluation, tobe known as Range Rated Radios.Two pages provide a simple andpractical answer to the question "Howfar can I talk." Also included are two

continued on page 4644 I ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

WV -517A VOMWV -518A VOM

WV -519A VOM

eachValues up to $44.75*

Just buy any one of the eight super RCA Test Instruments illustrated below from your local RCAdistributor. Send your warranty card plus one cent and your choice of one of the VOMs illustratedabove to: RCA Electronic Instruments Headquarters, 415 South Fifth Street, Harrison, N.J. 07029.We will ship your VOM choice promptly. Act now. Your request must be postmarked byDecember 15, 1974.

WO -505A - $329.00'5" OscilloscopeDC to 10 MHz

-.

WO -535A - $349.00*5" OscilloscopeTriggered SweepDC to 10 MHz

WT -524A - $159.00'FET/Transistor Tester

WR-538A - $129.95'Super Chro-BarGenerator

WO -33B - S229.00'3" Oscilloscope System

WT -333A - $199.00*3 -Meter Picture TubeTester/Rejuvenator

WR-515A - $195.00'Master Chro-BarSignalist

WV -510A - $139.00'Solid State AC/PortableVoltOhmyst

Specialists demand the best tools of their trade. Rim ElectronicInstruments



A Platt tool casewon't fall apart

at the seamsbecause thereare no seams.

In a 5 -year period, with most othertool cases, you'll go through about3 pallets.

The reason? Since the pockets onconventional pallets are stitched andriveted, they eventually tear loose at theseams. The pockets on a Platt palletare molded without any seams, stitchesor rivets to form a one-piece unit.They are practically indestructable.

The case itself is that same ruggedone-piece molded construction. It'smade of tough, lightweight, ABSThermoplastic.

And besides being stronger thanother cases, a Platt tool case ismuch lighter.

Also on a Platt tool case there's analuminum rim for extra strength.

A heavy-duty, steel core handle.And positive closure drawbolt locks.A Platt tool case is as practical as it

is strong. There are compartments forextra tools and equipment andmultiple lid pockets for papers andorder books.

To sum up a Platt tool case: Strong.lightweight, practical, good looking,plus a 5 -year guarantee on the caseand pallets.

It all equals an unequalled tool case.

rLUGGAGE

2301 S. Prairie Ave., Chicago, III. 60616(312) 225-6670

Enclosed is my order for toolcases.Prices: Ito 5 tool cases. $56.50 0,

6 to 24 tool cases. $51.50Enclose check and we pay the freight.

Please send me more information on toolcase.

ET/D

Name

Firm

Address

City

12tate Zip

Technical Literature ...continued from page 44

pages of detailed technical specifica-tions which help in determining thefeatures, performance capabilities andinstallation requirements for the prod-ucts in the line. Linear Systems, Inc.,220 Airport Boulevard, Watsonville,Ca. 95076.

CATV EquipmentA 45 -page catalog describes the

equipment manufactured by Syl-vania's CATV Equipment and Instal-lation Operation. The catalog, des-ignated ET -1289, contains informa-tion on Sylvania Pathmaker wide -bandcommunications equipment. Includedare sections on Series 2000 and 1000trunk amplifier stations, plug-in mod-ules, power supplies, passives, andaccessories. Product specifications andordering information also are given.Sylvania Advertising Center, 70 EmpireDr., West Seneca, N.Y. 14224.

Test Jigs and Service AccessoriesA 16 -page catalog, 1-74, features

test jigs, replacement parts and ser-vice accessories. This catalog hasmany new items for the service mar-ket. TELEMATIC Div., U.X.L., 2862 FultonStreet, Brooklyn, N.Y. 11207.

Instrument KnobsA 20 -page catalog describes a line

of matching knobs offered in a fullrange of sizes. Each of the styles ispresented with illustrations and di-mensions. The knob line is offered infour standard colors and all popularconfigurations, including single -round,pointers, skirted, concentrics, bars,half bars, bar concentrics and spin-ners. The Buckeye Stamping Co., 555Marion Road, Columbus, Ohio 43207.

Cable Tie Installation ToolA new, full -color bulletin, PAT -1,

describes a compact, hand -operated,fully automatic, cable tie installationtool for high -volume production re-quirements. Panduit Corp., 17301 Ridge -land Ave., Tinley Park, III. 60477.

SpeakersA 24 -page, four -color -illustrated

brochure describes hi-fi loudspeakersystems, including raw frame speak-ers and utility systems. Productsshown include two floor standing sys-tems, Stonehenge I and III, thelatest speaker additions to the line.The free brochure and a list of local

dealers is available by writing toAltec Sound Products Division, 1515 S.Manchester Ave., Anaheim, Ca.92803.

American National StandardsInstitute Catalog

The 1974 catalog of the AmericanNational Standards Institute is nowavailable free of charge. Contact theInstitute's Sales Department at 1430Broadway, New York, N.Y. 10018.

Tape Recorder CareA free booklet called "Tape Record-

er Clinic Procedures" describes step-by-step test methods for conducting atape recorder servicing clinic using theFerrograph Ferrotester. Elpa MarketingIndustries, Inc., New Hyde Park, N.Y.11040.

Electronic ChemicalsOffered is the latest catalog of aero-

sol products which not only includesthe company's aerosols available butalso depicts, with line drawings, theirapplications. It includes a "TypicalMaintenance Problems" chart whichlists the equipment to be maintained,the cleaning problem, the remedy andthe aerosol product which will solvethe problem. MillerStephenson ChemicalCo., P.O. Box 628, Danbury, Conn.06810.

Silicon RectifiersA I2 -page catalog describing silicon

rectifiers such as bridges, axial lead,high voltage packs, cartridges, OEMtelevision, Solid -Tube, and other spe-cial device rectifiers is now available.The catalog contains electrical charac-teristics, dimensional drawings, andphotos of the complete product line ofsilicon rectifiers. Sales Manager, Elec-tronic Devices Inc., 21 Gray Oaks Ave.,Yonkers, N.Y. 10710.

Small ToolsA new catalog is available on the

complete line of precision small toolsfor the communications, telephone andelectronic industries. P.K. Neuses, Inc.,Box 100, Arlington Heights, Ill.60006.

Needle and Audio AccessoriesThe new No. 774 Needle Replace-

ment and Audio Accessory Guide isnow available to Fidelitone distributorsand dealers. Contact Mr. John T.Strawa, Marketing Services Manager,207 North Woodwork Lane, Palatine,Ill. 60067.



Meet the Dodge CB 300 KaryVan:It'll handle your big delivery problems.A NIMBLE, MANEUVERABLEVERSATILE DOOR

Dodge CB300 is the perfect size-more room than standard compactvans, but smaller than big deliverymodels. Choose the 127 -inch wheel-base with a 10 -foot cargo body or the145 -inch -wheelbase van with a 12 -foot cargo body. Payload capacitiesto 3,505 pounds (up to 457 -cubic -foot capacity).

Dodge Kary Vans are easy to load.Cargo floor's only 26 inches off theground. 38 -inch -wide swing -out rearcargo doors are standard on all mod-els. (Optional: 70 -inch -wide swing -outdoors or a 70 -inch -wide roll -up door.)

Dodge Kary Vans are easy to driveand are available with convenientoptions such as power steering andautomatic transmission. The low, shortengine cover lets you get to the cargowithout having to crawl over things.WIDE CHOICE OF DEPENDABLE ENGINES.

Dodge offers you the smallestsix -cylinder engine available in a van-225-cid Six. There's also a 318 V8plus an optional 360 V8.FEATURES TO CHECK INTO AT YOURDODGE TRUCK DEALER'S.

The Dodge CB300 Kary Van is aperfectmaintenance truck. Here's why: Electronic Ignition System. It's

standard on all Dodge Kary Vans.There are no points or condenser (thatcould wear out or get wet).

Automatic speed control (only Dodgevans offer this option).

Optional automatic transmission andpower steering.

Largest standard fuel tank capacity(23 gallons).

Optional air conditioning. Optional steel shelving units. Optional partition between driver and

cargo.NEED A LITTLE LESS SPACE?LOOK INTO A TRADESMAN VAN.

Only Dodge gives you so many vansto pick from. Tradesman vans areavailable on either a 109- or 127 -inchwheelbase. There's also a Maxivan-it's the largest compact van builtin America.

K A 1 WI LWA \MAXI° VA N

u\TRADESMAN VAN

K-AFY VAN

EXTRA CAREIN ENGINEERINGMAKES ADIFFERENCE.

k DOEGE TRUCKS.podgeTrurns DEPEND ON 'EM.

. . for more details circle Of 'eader Service Card


CRC Lectra Clean, from CRC Chemi-cals, degreases and removes oil, wax,

dirt, and moisturethat cause currentleakage and electri-cal inefficiencies inheavy-duty motors.The stabilizing, fastacting solvent hasno flash or firepoints. It is ex-tremely low in in-halation toxicity, isnon -damaging to

No 02018 internal body or-gans and is low inskin penetrationtoxity. Non -stain-ing and non -corro-sive to metals, thecleaner removesforeign matter fromsuch things as cir-

cuit breakers, fuses and fuse holders,portable tools, transformers, etc.

NEW PRODUCTSDescriptions and specifications of the products in-cluded in this department are provided by the man-ufacturers. For additional information, circle the cor-responding numbers on the Reader Service Card inthis issue.

CHEMICAL CLEANERSafe replacement forcarbon tetrachloride

700

V

LECTRA

CLEAN

701COLOR TV COMPONENTS KITContains 29 components for servicingthe RCA XL -100 color TV chassis

RCA's new XL -100 ComponentsKit, Stock No. 199006, contains avariety of transistors, diodes and re-sistors, plus one circuit breaker. There

are 29 components in all. The deviceshave been selected by RCA Con-sumer Electronics as being the mostimportant for fast, efficient service ofRCA XL -100 color TV chassis. Useof the kit is simplified by a specialparts location diagram and a separatecross-reference chart. The diagram,which fits into the kit lid, simplifiesparts identification by showing the

exact location of each component inthe kit. The cross-reference showsusage of each part by chassis and cir-cuit symbol number. Price is $59.60.

CONTINUITY CHECKER 702

Continuity is indicated bya visual display or audible tone

Continuity of a circuit is indicatedboth audibly and visibly on the E -Z-

Coder Tone Tracer, a body conduc-tance continuity checker introducedby Thomas & Betts. The unit, which canalso be used to locate wires whoseorigin or termination is not readily

known, is designed so that the usercan be connected into the circuit anduse his fingers as the probe, for in-creased efficiency. The dual methodof circuit continuity indication pro-vides the user with several optionalmethods of using the checker. Thevisual display, indicated by a light onthe front of the instrument, is usefulin noisy areas or where an audibletone is not desirable. The audio toneindicator is controlled by an on/offvolume switch, and may be fed toa speaker on the front of the instru-ment or to a personal earphone.Powered by a nine -volt battery, thechecker is light weight, small, andcompletely portable.

ANTENNAS 703VHF point-to-pointYagi antennas

The Antenna Specialists Co. announcethe development of new three- andfive -element Yagi antennas designedprincipally forpoint - to - pointcommunications,in the 138- to174 -MHz range.The antennasfeature band-widths of great-er than 5 MHz.The wide band-width, withVSWR of lessthan 1.5:1, makes field adjustmentless critical, and also makes these

41

antennas particularly suited for multi-channel systems. The three -elementarray, Model ASP -816, has a forwardgain of 7 dB and is rated for windvelocities of up to 189 MPH. Thefive -element array, Model ASP -817,has a forward gain of 9 dB and a 145 -MPH wind velocity rating. Both mod-els feature aluminum alloy elementand boom construction. They operateat DC ground potential, for lightningprotection, and have a power han-dling capability of 500 w.

MATV DISTRIBUTIONAMPLIFIERS 704The 54 to 300 MHz band makes themcompatible with CATV systems

ACA has added two new distributionamplifiers to its MATV and homesystems. The "Mini -Mite" Series,Model HS 187 (82 Channel) andModel HSV 17 (VHF -FM), coversthe TV mid band and super band.Because of this extended band (54to 300 MHz), the amplifiers are com-patible with CATV systems. TheModel HSV 17 has 1.4 volts outputand 250,000 my input capability. The

Model HS 187 provides over one voltof output with an input of 200,000my. These units can also be used asline extenders or line amplifiers inlarge MATV systems. Both units havelightning protection diodes and a lownoise figure. Price of the Model HSVis $34.50, and that of the Model HS187 is $42.95.

DIGITAL MULTIMETER 705Portable, compact unit provides300 hr of battery operation

A full three -digit multimeter, Model3/24, reportedly weighs only 2 lb.complete with internal battery, yetprovides 300 hours of operation innormal use. Designed as a time saverfor quick and accurate measurements,the unit reportedly has a full five -func-tion measurement capability with 24ranges: 4 ranges of AC/DC voltage; 5ranges of ac/dc current and 6 rangesof resistance. On the DC voltage range,accuracies are said to be typically


0.2% ± 1 digit. The dimensions of theunit are 5 in. by 21/2 in. by 7 in. Ballan-tine Laboratories, Inc.

CABLE STRIPPER 706

Removes the outer coveringfrom most coaxial cable

A tool for removing the outer cov-ering from most types of coaxial cable5/16 inch to 11/2 inches in diameter isintroduced by ITT Ho-

lub Industries. Thestripper is called"Roto-Blade" be-cause the cuttingblade rotates or swiv-els and automatical-ly turns in the direc-tion the tool ismoved. Insulationcan be "rung cut" or"slit" lengthwise. Ca-ble with PVC, neo-prene, rubber, poly-ethylene, nylon, fi-berglass and similar types of insulationcan be stripped. A spring tension guideholds the cable against the blade foruniform cutting. The blade is adjust-able for cutting different cable materi-als and thickness up to 5/32 inch.

it

TRANSISTORS 707

Original equipment transistorsfor Japanese -built entertainmentelectronic systems

Seven original equipment transistorsfor replacement use in all major Japa-nese -built entertainment systems havebeen added to the existing line avail-able from the Commercial ProductsDivision of International Rectifier Corpora-tion's Semiconductor Division. The ad-ditional devices are: 2SA564A,2513187, 2SC281B, 2SC403A, 25C -535B, 2SC682A, and 2SC772. Thisexpands the Japanese Original Equip-ment Transistor line to 31 units. Thecomplete line now contains the tran-

sistors most often specified by themanufacturers of Japanese stereos,tape recorders, televisions and otherelectronic equipment.

708RESISTOR SUBSTITUTION UNITProvides resistances from 1 ohm to11.1 megohm in one -ohm steps

Small enough to be hand-held, anew aluminum -housed resistance sub-stitution unit by Phipps & Bird featuresan 11 -million step range, in one -ohm

steps. The Model 236-A unit usesone-half watt resistors with 1 -percenttolerance. Designed with three binding

continued on next page

with a new

FINCO '80 SeriesCOLOR SPECTRUM TV/FM ANTENNA

9 NEW MODELS AVAILABLEFINCO'S NEW '80 SERIES COLORSPECTRUM ANTENNAS consist ofmodels combining various levels ofVHF and UHF signal responsiveness.Thus there are models to fill thespecific needs of signal frequencies andstrengths as found in varying receptionareas.Write for Catalog No. 20-658. Dept. ET/D 10/74

The FINNEY Co.34 West Interstate Street

Bedford. Ohio 44146. . 'or more details circle 113 on Reader Service Card

hie/no& MJ-195

MASTER TEST RIGFOR TUBE AND SOLID STATE SERVICING

30 KV CAPACITY METAL CABINET SPEAKER BUILT IN

kie Dia tk

less 19" piclure tube

HIGH VOLTAGE METER STATIC CONVERGENCE FRONT PANEL CONNECTIONS

2245 Pitkin Ave.. Brooklyn.N.Y.11207,FREE' Adaptor Quick Retererce Chart

... for more details circle 129 on Reader Service CardOCTOBER 1974, ELECTRONIC TECHNICIAN/DEALER 148

DELUXE DIGITAL COLOR

CONVERGENCE GENERATORNOW AT A PRICE EVERYONE

CAN AFFORDROCK SOLID PATTERNS

ALL IC COUNTDOWN CIRCUITS

QUARTZ CRYSTAL OSCILLATORS

2 FULL YEARS' WARRANTY

...441111111

11111.11.0111,11111111111'

MODEL $7995SG -200 reg. $99.95

10 Patterns: Full & Gated Rainbow, 4Crosshatch, 4 Dot,Die Casted Ye" Alu-minum Case.

,,.:E,,GINCE GENERATOR

alp 8 ®'r,;;

1111.111.61111

MODEL $5995SG -150 reg. $74.95

10 Patterns: B&W Bars, White Field, 4Crosshatch, 4 Dot.

MODEL

SG -100

ONLY

$4795reg. $59.95

2 Patterns: 20 x 16 Crosshatch, 320Dots, weight only 17 oz.

SPECIAL PRICE LIMITED TIME ONLY

FULL 15 DAYS MONEYBACK GUARANTEE

ELENCO ELECTRONICS INC.8744 W. North Ter., Niles, III. 606483124325-3797 MODEL SC -

0 My check or money order enclosed.

COD-Add $2.50 mailing & handling.

NAME

ADDRESS

CITY STATE ZIP

DISTRIBUTORS' INQUIRIES INVITED

NEW PRODUCTS...continued from preceding page

posts (one to ground the case), theslide -switch unit provides resistancesfrom 1 to 11,111,110 ohms. Itsaluminum case, finished in wrinkleblue, measures 4 inches by 6 inchesby 1-3/16 inches. Price is $48.

DRILL BITDrills eighthole sizes

709

The Unibit drill bit, Model 11, fromUnibit Corp., enables the drilling of eightround holes, 9/16 -inch to one -inch,with a single bit. The drill bit requiresa starting diameter of 1/2 -inch or larg-er and removes material in 1/16 -inch

increments in eight steps. Designed foruse with any 1/2 -inch drill chuck, it isespecially effective when drilling roundholes in thinner gauges of sheet met-als. The bit is made of industrial grade,high speed steel, heat treated and tem-pered to assure maximum strength. Itcan be easily sharpened without specialtools.

MULTI -FUNCTION COUNTERFeatures autorangingand autoreset

710

An autoranging, 80 -MHz Multi -Counter, Model 1900A, featuringLSI/MOS circuitry, autoreset on allfunctions, gate times, filter and attenu-ator, is offered by John Fluke Mfg. Co.It has autoranging in both frequencyand period measurement modes, andfour over-riding gate times for man-ual selection of resolution to .1 Hz.It can he used to totalize as well asto measure frequency and period, withevent counting up to 10(' events, andhas a large, six -digit LED display withleading zero suppression, automaticannunciation and overflow. Signal in-

put conditioning is provided in theunit with a switchable, 1-Mz, low-pass filter and attenuator. The dynam-ic range is 5 Hz to 80 MHz. The unithas a sensitivity of 25 my (typically

15 my)ber of options, including a recharge-able internal battery pack, capable ofproviding five hours of continuousoperation, and parallel data output,with decimal point and annunciation.Price is $349.

and is available with a num-

INTEGRATED CIRCUITS ANDMODULES 711

Direct replacements forimportant counterparts

The Electronic Components Group ofGTE Sylvania Inc. has added a series ofintegrated circuits and solid-statemodules, intended as direct replace-ments for their imported counterparts,to its ECG semiconductor productline. Designated ECG 1000 series, theline consists of silicon monolithic in-tegrated circuits and both thick- andthin-film hybrid encapsulated mod-ules. The line replaces imported prod-ucts used in color and black and whiteTV sets, stereos, radios, tape recordersand other types of entertainmentelectronic equipment available fromapproximately 127 manufacturers inthis country. The ECG semiconductorline and related cross-reference guidesare available through authorized GTESylvania distributors. The line con-sists of replacements for more than90,000 solid-state devices used in en-tertainment, industrial and commer-cial electronic equipment.

TV TEST RIG 712

Complete setup fortube and solid-state chassis

The Master Rig, Model MJ-195, isthe newest addition to the Telematicline of TV test rigs. This unit is acomplete setup for both tube andsolid-state chassis. Features of thisunit include a built-in high -voltagemeter, speaker, front panel connec-tions and metal cabinet. Whenequipped with the proper picture tube,

. . . for more details circle 111 on Reader Service Card50 I ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

they are capable of operating withlate -model TV chassis which produceover 30 kv of second anode voltage.The unit conies complete with allcomponents for deflection circuithookup and four solid-state yokeadaptors. Price is $149.95.

FIELD -STRENGTH METER 713

Designed forportable use

A compact, portable, field -strengthmeter is introduced by Ascom ElectronicProducts. The unit, known as ModelASM-105, is designed for field checksof antenna radiation. It can be used totune antennas for peak radiating effi-ciency, as well as for making compara-

tive tests of various transmitters andantenna system installations. The me-ter requires no internal power, operat-ing entirely from the RF field, andcovers the frequency range from 27MHz through 225 MHz. This includesthe Class D citizens band, low -bandand high -band VHF land -mobile chan-nels, as well as the amateur 10-, 6-, 2 -and 11/4 -meter bands. Price is $15.95.

OSCILLOSCOPE 714

Displays color TV or videowaveforms by pushing a button

Sencore, Inc., has introduced a com-pletely automatic triggered, pushbut-


NIT CONTAINS:

Carrying CaseBoeste!GablesT ire Intlercv FireE xhriguisher EmergencyBlinker Auto Spot Lite Gas Siphon Purnp SOSF lag F ast Aid Deal Complete InstrUCts:l Sheer

DELUXEHIGHWAY EMERGENCY

KIT

$995ONLY

PLUS 3 TUN -O -WASHOR TUN -O -POWER

LABELS

TEXAS INSTRUMENTS8 DIGIT, FLOATING DECIMAL

95PLUS 5 TUM-O-WAS-IOR TUN -O -POWERLABELS

Get These Outstanding ValuesJust For Trying

TUNOWASHor

TUNOPOWERTUN -O -POWER is the first tuner re-

storer. It cleans, polishes and lubri-cates. TUN -O -WASH is like an ultra-sonic bath. It washes away all dirt.grease and gunk.

We are offering the Calculator and theHighway Emergency Kit at greatly re-duced prices because we want you totry TUN- 0 -POWE R and TUN -O -WASH.Once ycu do, you won't want to bewithout them.To order your Calculator or HighwayEmergency Kit, mail your check andlabels to:

CH EMTROMCS

ER 7.EGFILASERFOR

C 4,10 0100,8INNIAL AND

_%.

FOPERN 431.7 i*"guars .0art, _17;

IN 1107; doea.. " M

MOe AM MA"r_ INCORPORATED

126C RALPti AVE BROOKLYN N Y 11236Our business if improving yours.

CH1E/AVIONICS

. . . for more details circle 105 en Reader Service Cord

OCTOBER NT!, ELECTRONIC TECHNICIAN/DEALER 151

NEW PRODUCTS ...continued from preceding page

ton oscilloscope, Model PS29 MinuteMan. This scope enables techniciansto display commonly used color TVor video waveforms by simply pushinga button. The pushbutton -selecteddisplays include TV Vertical, TV

Horizontal, 3.58 -MHz, (for viewingthe color subcarrier information),five -times expand and a color vectordisplay. The sixth button sets thescope for 60 -Hz line sweep, used insweep alignment. The unit can betriggered internally on any signaldown to 20 my. Provisions for ex-ternal triggering also are included.This oscilloscope can also be used asa general purpose unit-with DCcoupling; 5000 v AC input protec-tion; 10 -MHz bandwidth, with verticalsensitivity from 10 my/div. direct, to500 volts 1 division, using the 10 X 1probe, at 3 percent calibration ac-curacy. The 3.58/vARtsPEED buttonand the horizontal sweep control pro-vide signal display for non -video fre-quencies from DC to 10 MHz. Priceis $495.00, probe included.

TRANSISTOR/ FET TESTERCombines speedand accuracy

A dynamic transistor/field-effecttransistor (FET) tester that representsa different design approach in solid-state test instruments is introduced byRCA Electronic Components. Featuring alarge, 61/2 -inch meter and two plug-in

715

transistor socket adapters, the RCAWT -524A combines fast operationand high measurement accuracy fortesting all types of bipolar and FETtransistors, including Darlington anddual types, with an accuracy of ±-3percent. Transconductance of FET's,including depletion or enhancementtypes, N- or P -channel types, dualtypes and dual -gate types, can also bemeasured up to Gm values of 100,000.Zero bias drain current, DC drain cur-rent and out -of -circuit gate leakagemeasurements can also be made. Op-erating current levels are adjustable upto 20 mA for all of these tests. Theinstrument is supplied with completeinstructions, two plug-in test adapters-one each for bipolar and FET tran-sistors-as well as a set of clip leadsfor in -circuit testing. Price is $159.

HEAD DEMAGNETIZERRemoves residual magnetismfrom heads, capstans and guides

Nortronics Company, Inc., is introduc-ing a head demagnetizer which is de-signed to remove residual magnetismfrom recording heads, capstans andguides. Designated Model QM -202,the unit generates a controlled 60 -Hz

716

magnetic field which is strong enoughto effectively demagnetize, without be-ing so strong that additional residualmagnetism is created. Its primaryfunction is to demagnetize active polepieces and faces in recorder playbackheads, preventing hiss, noise and pos-sible erasures which can be caused bymagnetized head. It features a flexibleprobe which will flex to reach usuallyinaccessible recorder/player parts. Themagnetic field radiates from the tip ofthis probe, which is designed to con-tact sensitive areas without danger ofphysical damage.

FIELD -STRENGTH METER 717

Features precision geardrive with 1 dB accuracy

Sadelco, Inc., has introduced theModel FS3B VHF/UHF ProfessionalField -Strength Meter, which features abuilt-in speaker and precision geardrive with 1 dB accuracy. Other fea-tures include a logarithmic scale thatcuts attenuator manipulations in half.Direct -reading VSWR and return -lossscales extend this instrument's capa-bilities when used in conjunction with

Sadelco's Spectrum Analyst. It has avoltage -regulated battery supply, gold-plated attenuator switches and a safe-ty switch that turns off power when

the cover is closed. Another safety fea-ture is built into the on/off switch:When in the off position, the meter isautomatically shorted, reducing thepossibility of damage during transit.

VHF TEST METER 718

Checks VHF transmitterand antenna operation

A multi -tester designed for testingand monitoring VHF communicationssystems is announced by Ascom Elec-tronic Products, a division of The AntennaSpecialists Co. The unit, Model ASMR-100, checks both transmitter and an-tenna operation over a frequencyrange of 144 to 174 MHz. This rangeincludes the VHF marine band, landmobile "high -band" channels, and theentire two -meter amateur band. Fea-tured on the tester is a dual -rangewattmeter function (0 to 25 and 0 to

50 watts). Transmitter output is in-dicated directly in watts on eitherscale, with -±8 percent accuracy. Alsoprovided is a function to measure thevoltage standipg wave ratio (VSWR),for checking antenna operation andadjustments. To monitor overall sys-tem operation, a field -strength meterfunction can be used to indicate thatthe system is radiating. Price is$69.95.

For more information on these

NEW PRODUCTS

See pages 59 and 60

READERS SERVICE


DEALER SHOWCASEDescriptions and specifications of the products in-cluded in this department are provided by the man-ufacturers. For additional information, circle the cor-responding numbers on the Reader Service Card inthis issue.

HOME ALARM SETS 719

Offers extra profits toelectronics dealers

A new line of "Snap On- HomeAlarm Sets is introduced by Master LockCo. Fast and easy installation is empha-sized, every component is pre -wiredwith exclusive Snap On connectors.There are no wires to cut, strip, solderor splice. The power source is a stan-dard 6- or 12 -volt battery. Eachunit includes a solid-state controlcenter which is always active, evenwhen the burglar system is turned off;an electronic super siren, with separate

signals for fire or burglary; a keyswitch which permits the system to beturned on or off from outside of thehome; intrusion detectors for doorsor windows; fire detectors; 20 -ft. ex-tension cords; three-way connectors;an easy -to -follow installation manual;and identifying warning decals. Thebasic Home Alarm Set price is $69.95,and an expanded deluxe version(shown in photo) is available for$99.50.

AM/FM WEATHER BANDRADIO 720

Pre-set weather band provides 24hours of continuous weather reports

Panasonic has introduced Model RC -6304, an FM/AM Weather Band Ra-dio with a digital clock. The radio's

special features are a pre-set weatherband, which provides 24 hours of con -

tinuous weather reports, and a newdigital clock. It also offers a lightedradio dial and clock face, an alarmflasher that glows when the alarm isset, a 10 minute doze feature, a chirpalarm, two-step tone control boost forbass and treble, and a three-inch PMsynamic speaker. The radio is housedin a wood -grain finish cabinet. Priceis $69.95.

ANTENNA DISPLAY 721

Occupies less than twosquare feet of floor space

A compact outdoor antenna mer-chandiser that displays as many asnine boxed RCA Permacolor Antennas

in less than twosquare feet offloor space isnow availablefrom RCA Partsand Accessories.The RCA Out-door AntennaMerchandiser,MU - 1937, isconstructed ofgold -tone ano-

dized rails and legs and blue andwhite side panels. Heavy wire rodsarranged in a grid pattern hold theboxed antennas in an upright positionand the rack is backed up with 3/4 -

inch plywood. Included with the mer-chandiser are two multi -angle mastbrackets, for displaying one or moreRCA Permacolor antennas or a4BG00 antenna mock-up. The displaymeasures only 181/2 inches wide by161/2 inches deep by 281/2 inches high.The unit is designed for use against aback or side wall, next to the end ofa counter, or as a free-standing aisledisplay.

HEADPHONE CONTROL BOXAllows control ofvolume and balance

722

A Stereo Headphone Control Box,Cat. No. 30-5250, is offered by GC Elec-

tronics. The unit provides control of

the volume and balance of stereoheadphones, without the user leaving


Ara mg, ff;p oarAUTOMATIC

STAPLE GUNSCUT WIRE & CABLE

INSTALLATION COSTS. . without cutting into insulation!

SAFE! Grooved Guide positions wire forproper staple envelopment! Grooved DrivingBlade sbps staple at right depth of penetrationto prevent cutting into wire or cable insulation!

No. T-18-Fits wires up toin3/16" diameter.

BELL,..)\ TELEPHONE,

,1\40. THERMOSTAT,INTERCOM,BURGLAR

ALARMand other lowvoltage wiring.

Uses T-18staples with 3/16" round crown

in 3/8" leg length only.

No. T-25-Fits wires up to1/4" in diameter.

Same )asic constructionand fastens samewires is No. T-18.

Also used forRADIANT

HEAT WIRE

Uses T-25 stapleswith 1:4" round crown in 9/32",3/8", 7/16" and 9/16" leg lengths.;

T-18 and T-25 staples also available in Monel andwith beige, brown and ivory finish at extra cost.

. T -75---Fits wires and cablesup to 1/2" in diameter.

RADIANT HEATCABLE,

OF CABLE,WIRE CONDUIT

ttl COPPER TUBINGor any non-metallic

sheathed cable.Also used as

DRIVE RINGSin stringing wires.

Uses T-75 staples with 1/2"flat crown in 9/16", 5/8" and

7/8" leg lengths.

Arrow Automatic Staple Guns save 70% in timeand effcrt on every type of wire or cable fasten-ing job. Arrow staples are specially designed withdivergert-pointed legs for easier driving androsin -coated for greater holding power! All -steelconstruction and high -carbon hardened steelworking parts are your assurance of maximumlong -life service and trouble -free performance.

Ask your Electrical Supply Dealeror write for further details.

......%midi* Brook. Now Jorscy 07643. --........,_

"Pioneers and PacesettersFor APmost A Half Century"

OCTOBER

. .. for more details circle 101 on Reader Service Card

1974, ELECTRONIC TECHNICIAN/DEALER 53

TheComplete

Line

fiVG.1Z1MATVCAT!,

EQUIPMENT Get all your MATV-CATV needs

from one reliable source. Free layout service. Send for our 120 page catalog

(No. 20-554). It's FREE when requestedon your company letterhead.

THE FINNEY COMPANY34 W. Interstate St., Dept. ETD -10.74

Bedford, Ohio 44146

The Champion of all IndependentElectronic Service

. for more details circle 114 on Reader Service Card

DISCOUNTTEST

EQUIPMENTSPECIALISTS

HICKOK

SEIVCOI=IE RCALgasigi;

COMPLETE LINE OF ELECTRONIC SUPPLIES

ICC/Mullard & Raytheon TubesTelematic Test Rigs

FREE CATALOGQUOTATIONS ON REQUEST

FORDHAMRadio Supply Co., Inc.

558 Morris Ave., Bronx, N.Y. 10451Tel. 12121 585-0330


DEALER SHOWCASE...continued from preceding page

his or her chair. The control box plugsdirectly into the amplifier. Separatecontrol of the volume and balance ofeach ear piece is provided by noise -free slide controls. The unit comesequipped with a 5 -ft. cord and a stan-dard, three -conductor, stereo phoneplug. The unit is also equipped witha switch for mono or stereo selection.

STEREO SPEAKERMERCHANDISER

new concept is that the car owner isnot restricted to one design forever,since it only takes about five minutesto change the panel. The 61/2 inchspeakers fit into a variety of locationswithin the car's interior.

RECORD CLEANER 725

Electric powered automaticrecord cleaning device

Vor Industries have developed andpatented a new product for the con-

723 sumer named "VAC-O-REC," an elec-tric -powered, automatic -record -clean -

On -the -spot comparison of speakerselection made with pushbuttonswitches

The "Speaker Tree," a self-con-tained merchandiser that allows cus-tomers to compare the performance of

five stereo speak-ers in a new line,is announced byInnovative AudioSystems, Inc. Byoperating a sim-ple pushbuttonswitch, the cus-tomer can makean on -the -spotcomparison andselect a speaker,

with little or no help from sales per-sonnel. The display features five mod-els, ranging from a six-inch, two-way,to a twelve -inch, four-way system.The merchandiser occupies only threesquare feet of floor space and comeswith an initial inventory package con-sisting of 13 pairs of speakers.

AUTO STEREO SPEAKERS 724

Front panel fabrics can quicklybe changed using most materials

Pioneer Electronics has introduced anew line of speakers called Chame-leons, featuring a removable, exchange-

able front panelthat can bemodified, mixedor matched tosuit the con-sumer's moodand the car'sinterior. Varia-tions in designarc limited onlyby the imagina-tion of the

purchaser, since just about anymaterial can be used to cover thepanel. Sound from the stereo speak-ers emanates from both around andthrough the fabric or graphics displaypanel. An additional advantage of this

ing device which, without harming therecord, reaches deep into the groovesto the microscopic level, loosens themicrodust particles with its naturalmohair brushes, and, via the vacuumcleaning action, removes the dust.When in use, it rotates the insertedrecord slowly for cleaning. Simultane-ously, its static reduction circuit re-duces the record's dust -attracting elec-tromagnetism from as high as 20,000volts to a low, near -neutral, voltage.

TV REMOTE CONTROL 726

Works with any TV setand does not use motors

A new type of remote -control unitthat works with any TV set is intro-duced by the Distributor Sales Divi-sion of Jerrold Electronics. Completelysolid-state and without motors, thenew product turns the TV set on andoff, changes channels instantly andfine tunes from anywhere in the room,up to 25 ft. from the TV set.

The Universal TV Remote Control,Model TRC-12, consists of two units:a converter and a remote control unitconnected together by a thin 25 -ft.control cord. The converter can be


high s

quality

without

high cost

IN A CONTROLLED

OUTPUT

SOLDERING IRON

ByWellerModel W-60. Versatile 60 watt, pencil -type tool with automatically controlledtemperature and output. Only 71/4"long.Weighs but 21/2 oz. Quick -change,anti -oxidation -coated 1/4" screwdrivertip. Several other sizes available withchoice of temperature outputs. Usewith or without optional, mounted orfree-standing bench stand PH -60.

Ask your local distributor or write ...

Weller -XceliteElectronics Division

1 The Cooper GroupCOOPER P 0 PDX 728.

("Dusn'") APEX, NORTH CAROLINA 27502. for more details circle 132 on Reader Service Card

located any convenient distance fromthe TV set. The only wiring necessaryis connection of the TV antenna lead-in to the converter, and then connec-tion of the converter output to the an-tenna terminals on the back of the

TV set. The remote control unit canbe placed anywhere in the room thatis convenient. The control cord issmall enough to hide under the rugor to run unobtrusively along a base-board. Remote channel changing isaccomplished by a varactor diode os-cillator. This makes it possible tochange channels without physicallyrotating the TV tuner. The remotecontrol has no moving parts, exceptfor twelve push-button channel selec-tor switches, a rocker -type on/offswitch and the fine tuning control. Itconverts all incoming VHF channelsto either Channel 2 or Channel 3,whichever is unused in the area. Afterinstallation, the user leaves the VHFtuner in the TV set tuned to eitherchannel 2 or 3. The AC cord of theTV set is plugged into the convenientoutlet on the converter. It also helpseliminate interference caused by di-rect pickup of signals when the setis connected to an MATV system.Price is $100.

STEREO CASSETTE 727

Features Dolby systemand "Memory Rewind"

A stereo cassette play/record deckfrom Channel Master features the Dolbynoise reduction system and a "mem-ory rewind" that permits automaticreturn to any selected point on thetape. The unit, Model 6622, featuresautomatic shutoff of the amplifier andmotor when the tape ends, and a selec-tor switch for chromium dioxide tape.The memory rewind permits continu-ous playing of tape sections. Otherfeatures include two color -coded, il-


Low

midget

driver setsBY Xcelite

0

FOR DOUBLE DUTY ON DOZENS

OF POPULAR SCREWS AND NUTS0 0 0 0 Three new assortments have joinedXcelite s family of "Compact Converti-bles." Each an Xcelite "original." No-where will you find such a variety ofsizes and types in a midget set, fordriving slotted, Phillips, Allen, Scrulox',hex, and clutch head screws. And hexnuts.

All of professional quality, precisionmade of finest materials. All doing"doub,e duty" with torque amplifierhandle that slips over color -codedmidget tools for longer reach, greaterdriving power. Each easily identifiableon the bench or in the service kit thruXcelite's exclusive, optically clear, plastic"show case" that closes securely withpositive snap -lock.

NEW!PS130 -3 slot tip, 2 Phillips screw-drivers, 5 nutdriversPS140 -4 slot tip, 3 Phillips screw-drivers, 3 nutdriversPS6 -3 slot tip, 3 Phillips screwdriversPLUS - PS88, PS120, PS7, PS89, PS44,and PS TR-1 with varying selec-tions of screwdriversand nutdrivers.

Ask your local distributor or write

Weller -XceliteElectronics Divisionga The Cooper Group 0coma ORCHARD PARK, N.Y.14127MUMS

.. for more details circle 133 en Reader Service Card


SOB'STV I RADIO

SERVKE

.

"There sure isn't any professional jealousyamong them. Each one highly recommends theothers."

NATION-WIDETUBE 8 TRANSISTOR CO.OUR 21st MAIL ORDER YEAR

ORDER NOW from This Sample Listing

OZ41S41U43BW23DG44BZ64E175CG85165U45V66AC76AH46AK56AL56AU66AX46AY36BG66BH66BK4'BUS6BZ66(B6

ORIGINATORSOF

30 4Tubes

$27 per 100Some Slightly Higher

6CG7 6F55KGB 6GF76CK3 6GH86CM7 6GM66DG6 6HB76DT6 6J56EM5 6166FH5 61M6

6LN86LX86S46SN76V66X86X97B88FQ781V89KZ810CW511 M5812AV712BY7125N713GF7171116171Z819BG621LR825L669737868

DISCOUNT TRANSISTORS(Sylvania & RCA Types)

ECG 128 69c Ea. - 10 for $6ECG 152 594 Ea. - 10 for 85ECG 169 1.49 Ea. - 10 for $14SK 3004 59c Ea - 10 for SSSK 3010 59c Ea. - 10 for $5SK 3018 59c Ea - 10 for $5Si( 3019 59c Ea - 10 for $52N 3054 694 Ea - 10 for $62N 3055 79c Ea. - 10 for $7

All tubes & transistors individually boxed,branded, code dated, guaranteed 1 year.5 day money back offer. All tubes & tran-sistors shipped immediately, prepaid.

SEND FOR FREE COMPLETE LISTI

TUNER REPAIRSend for free brochureof our specialized ser-vices. Our Tuner Re-pair Department willrebuild or replace anytuner (including tran-sistor types). Our price$8.99 phis El ship.

SOLID-STATEREPAIR

Our Home Entertain-ment Repair Dept.will repair any unitfrom a pocket radio toa transistor TV. Sam-ple charges: cassette$8.95 plus parts. AMcar radio $8.95 plusparts. Send no moneywith repairs. Whencompleted, they will hereturned COD. Satis-faction guaranteed oryour money back.

PICTURE TUBESPECIALS

Color; Black A WhiteAll Guaranteed 1 Yr.9x11-1Plus $2 Dud Deposit10A1tP4 . 23.95I'lus $3 Dud Deposit12BZP4 23.95Plus $3 Dud Deposit190AB4 . 23.95Plus $3 Dud Deposit310AD1s4 23.95Phis 33 I Deposit19x1'4 . 21.95

No Dud Deposit231.'1:1.4 . 26.95Plus $5 Dud Deposit19EYP22 47.95

$15 Dud Deposit211.'11'22 . 49.95

No Dud Deposit25AP22 53.95

$15 Dud DepositDud Deposit will berefunded to you whendud Is returned inoriginal carton undervacuum. All tubesshipped Immediately,prepaid.

TERMS: Credit established after initial or-der. No minimum order. Send check ormoney order. Add $1.00 for handling on or-ders under $9.00. Canadian & Foreign, addapprox. postage. 25% deposit on COD's.

NATION-WIDECUBE 8 TRANSISTOR CO.

1275 Stuyvesant Ave., Union, N.J. 07083Tel 12011 688-1414 Dept. ET1O

DEALER SHOWCASE...continued from preceding page

luminated, level meters; digital count-er with reset button; slide controls forright and left recording levels; dust -free tape head mechanism; and anoutput jack for headphones. The unitemploys 14 transistors, 10 diodes, and

two IC's. It measures 4 inches high,135/8 inches wide, and 914 inchesdeep. There is a four -month, over-the-counter exchange guarantee. Priceis $219.95.

FULL LOGIC SQ DECODER 728

Features wave -matchingand variable blend

Superscope, Inc., announces the Mod-el SQA-2 full -logic SQ decoder fromMarantz. Separation of up to 20 dBis provided by the decoder. The de-

coder fits into a special under -chas-sis slot built into most MarantzQuadradial receivers. With each im-provement in 4 -channel sound, onlythe inexpensive decoder itself need bereplaced. Price is $79.95.

AM/FM AUTO RADIO 729

Designed to harmonize withdashboards of late -model cars

The Model ID -200 in -dash, AM/FM, push-button, automobile radio isintroduced by Audiovox Corp. The radiois designed to harmonize with thedashboards of the latest model cars.A slide -bar band switch changes re-ception from AM to FM by simplyflicking the switch from left to right.All five quick -set, push buttons canbe set for either AM or FM recep-

tion or any desired configuration.Solid-state components are used ex-clusively in the circuits. The circuitryemploys 12 transistors, one IC, and

10 diodes. Other features include:automatic volume control, AFC, L/Dswitch, tone control, and push/pulloutput. Sensitivity: Less than 30microvolts at 20 dB S/N on AM andless than three microvolts at 30 dBS/N on FM. The radio measures 73/4inches wide by 2 inches high by 57/sinches deep and weighs 3.4 lb.

PHONE ANSWERING SYSTEMHas unique 730one-year guarantee

Channel Master is introducing the firstautomatic telephone answering systembacked by a one-year, over -the -count-er -exchange guarantee. The AnsweringSystem, Model 6000, is designed forgeneral home and business use. It canbe set to respond to any number ofrings. A "re-cording" lightglows whena message isactually be-ing received,and a built-in monitorpermits youto listen inon the callerwhile his mes-sage is being recorded. A "message re-ceived" indicator light shows that callshave been received. The device has a60 -second recording cycle, built-incondenser mike, automatic level con-trol, and features simple push-buttonoperation. Price is $129.95.

FREE ALARM CATALOGFull line of professional burglar andfire alarm systems and supplies. 96pages. 450 items. Off the shelf delivery,quantity prices.

0 mountain west alarm 4215 n. 16th st., phoenix, az. 85016

*Say

... for more details circle 120 on Reader Service Ca d

FREE CATALOGHARD -TO -FIND PRECISION TOOLSLists more than 2000 items-pliers,tweezers, wire strippers, vacuum systems,relay tools, optical equipment, tool kitsand cases. Also includes ten pages ofuseful "Tool Tips" to aid in tool selection.

JENSEN TOOLS4117 N. 4411. Street, Pine,. A... 850,1

... for more details circle 117 on Reader Service Card... for more details circle 121 on Reader Service Card56 I ELECTRONIC TECHNICIAN/DEALER, OCTOBER 1974

Balancing Channels ...continued from page 34

weaker, the signals are combinedand made available at the outputjack. Several CE's may be used incomplex antenna installations. Insome installations, the output of oneCE may be connected to the couplinginput of another (instead of to anantenna lead-in), to combine the sig-nals before applying them to the in-put of a distribution amplifier.

Mixer EqualizersThe third method of equalizing

signals employs mixer equalizers(ME's). ME's are designed to sep-arate or combine four nonadjacentlow- or high -band VHF TV chan-nels and to provide 0 to 20 dB ofequalization on each channel (Fig.3). Each ME will combine fournonadjacent channels into one out-put or it will separate a single com-bined input into four individual out-puts consisting of 3 nonadjacentlow -band channels plus FM or fournonadjacent high -band channels.

Each ME unit is factory pre -tuned for the received channelsspecified. That is, they can acceptseveral nonadjacent channels car-ried on a single cable and separatethem so that each appears at itsown individual output jack. Like-wise, an ME can take separate non-adjacent channels, such as the out-put of four single -channel antennasor strip amplifiers, and combinethem into a single output. ME's areideal when it is necessary to sepa-rate and equalize channels from abroad -band antenna, deliver themto be amplified in Ultra-Plex®single -channel strip amplifiers andthen recombine them for distribu-tion over a trunkline.

Other MethodsThe three methods of signal

equalization described previouslyare by no means the only onesavailable, but they do representeconomical and convenient methodsof signal equalization in mediumand large MATV systems.

For homes and small stores orapartments in which multiple anten-nas are employed or in which chan-nel -to -channel levels vary widely,the best solution might be channel -control couplers (Fig. 4) or single -channel VHF cartridge traps (Fig.5) in combination with antennapreamps, where required.

(

0

Ia

Rum"This time why don't you wait and see if his diagnosis j.bes with yours before you tell him

what's wrong with it?"

(CORNELL) ELECTRONICS COMPANYTHE ORIGINAL

HOME OF

100 TUMOR MORE33c rig TUBE

4213N.UNIVERSITV AVE. SAN DIEGQ CALIF. 92105

Same Low Price * Bargain Tools

East or West Coast!* Transi ;tor Teshr* TechnCian's Leary

ONE YEARGUARANTEE

INDIVIDUALLYBOXED

5 DAY MONEYBACK OFFER

LAB TESTED USED

SEND FOR FREENEW 48 PAGE

COLOR CATALOG* Dumort Picture Tubes* Diodes-Tronsistors--Kits* Tube Cartons

SPECIALOFFER

ON ALL ORDERSOVER

PER TUBEmo umn

FROM THIS LIST

6AG5 6CB66AU6 6.166AX4 6SN7

Your Order FREE if Not Shipped in 24 Hours

THE LARGEST

. . . far more details circle 107 al Reader Service Card

SADELCO FS719B!

Offers the Best!SINGLE INPUTUHF/VHF/FM

BU LT -INSPEAKER

Features Accuracy Price

For the name of your local distributor, contact:

SADELCO, INC.299 Park Ave.Weehawken, N.J. 07087

Finest In Its Class 201 866-0912MANUFACTURER OF TELEVISION FIELD STRENGTH METERS IN THE U.S.A.

Available in Canada from Comm-Plex Electronic Ltd.... for more details circle 127 on Reader Service Card

OCTOBER 1974, ELECTRONIC TECHNICIAN/DEALER 1 57

do swo.L,Log

Start saving the gray bottom flaps withthe GE monogram from GE entertain-ment receiving tube cartons. They reworth valuable awards to independentservice dealers and technicians in afabulous gift bonanza program fromGeneral Electric.

The gift list includes some 43 itemsranging from sporting equipment tohome appliances, from diamond jewelry

to distinctive luggage. from globes andbooks to calculators and Attend -a -Phones. It even includes the much prizedPolaroid SX-70 camera and AmericanExperience weekend vacations at anyone of 101 prestigious resorts.

BOTTOMS UP!!! Redeem yourflaps by November 30. 1974. Full detailsat your authorized distributor.

TUBE PRODUCTS DEPARTMENTGENERAL ELECTRIC COMPANYOWENSBORO. KENTUCKY 42 301

GENERAL ELECTRIC

This Cordless Soldering Ironis worth about

Still the greatest advance insoldering since electricity.

WAHL

$ 900 At least that's what our customershave been telling us. Because so

many user response cards have said the same thing:"it's worth its weight in gold".*

Well, we started wondering just how much thatwould be. After all, it only weighs 6 ounces .

complete with built-in worklight to let you see whatyou're soldering. A simple press of the button givesyou over 700° soldering heat in less than 5 seconds,and our exclusive "lock off" switch preventsaccidental heating of the tip. (Incidentally, we have4 completely different interchangeable tip sizesfrom heavy duty to fine.)

You can carry it anywhere and make up to 125electronic joints (or more) per charge and there'snever a cord to get in the way. Its recharging standrepowers its batteries overnight . . . and theiron is UL approved.

Accessories include carrier storage tube,auto charger, and 4 replacement tips.For all details, see your localelectronic component distributor.

So, don't think of Wahl'sIso-Tip as 'just a solderingiron'. Think of it as 850.5karats of cordless solderingfreedom for less than $20.

CLIPPER CORPORATION2902 Locust Street Sterling, Illinois 61081Phone: (815) 625-6525

Manufacturing Excellence Since 1919

READERS

SERVICE INDEX

ADVERTISER'S INDEX101 Arrow Fastener Co., Inc. 53102 B & K Division, Dynascan Corp. 39103 Book Club-Tab Books 16-19104 Channel Master, Div. of Avnet, Inc. 15

105 Chemtronics, Inc. 51

106 Chrysler Corporation, Dodge Division 47107 Cornell Electronics Co. 57108 Cusack Electronics 30109 Delta-Benco-Cascade, Ltd. 30110 Eico Electronic Instruments Co. 10111 Elenco Electronics Inc. 50

112 Exact Electronics, Inc. 9

113 Finney Company, The 49114 Finney Company, The 54115 Fordham Radio Supply Co., Inc. 54137 General Electric Company

Television Business Division 31General Electric CompanyTube Division ...58GTE Sylvania, Consumer Renewal 1, 21

116 International Rectifier Corp.CPD Division 25

117 Jensen Tools & Alloys 56118 JFD Electronics Corp. 3

119 Leader Instruments Corporation Cover 3120 Mountain West Alarm Supply Co. 56121 Nationwide 56122 Platt Luggage 46123 PLC Electronics, Inc. 14

124 PTS Electronics, Inc. Cover 2125 RCA Electronic Instruments 45

RCA Parts & Accessories 35RCA Picture Tubes 4.5

126 Rohn Manufacturing 8127 Sadelco 57128 Sprague Products Company 11

129 Telematic Div., UXL Corp. 49130 Triplett Corporation Cover 4131 Wahl Clipper Corporation ...58132 Weller-Xcelite . ..55133 Weller-Xcelite ..55134 Winegard Company

. .38135 Winegard Company ...13136 Workman Electronic Products, Inc. .. 43

NEW PRODUCTS700 Chemical Cleaner 48701 Color TV Components Kit .. 48702 Continuity Checker 48703 Antennas 48704 MATV Distribution Amplifiers .. 48705 Digital Multimeter 48706 Cable Stripper ..,49707 Transistors .49708 Resistor Substitution Unit .49709 Drill Bit 50710 Function Counter 50711 Integrated Circuits and Modules .50712 TV Test Rig 50713 Field -Strength Meter 51714 Oscilloscope 51715 Transistor/FET Tester 52716 Head Demagnetizer 52717 Field -Strength Meter 52718 VHF Test Meter 52719 Home Alarm Sets 53

720 AM/FM Weather Band Radio .53721 Antenna Display ..53722 Headphone Control Box ...53723 Stereo Speaker Merchandiser ..54.

724 Auto Stereo Speakers 54

725 Record Cleaner 54

726 TV Remote Control 54

727 Stereo Cassette 55

728 Full Logic SQ Decoder 56

729 AM/FM Auto Radio 56

730 Phone Answering System 56

TEST INSTRUMENT900 Heathkit Model IT -121 FET, Transistor

Tester 40... for more details circle 131 on Reader Service Card


READER SERVICE INFORMATION CARD 10-74

Circle

the

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Service

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of those

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ADVERTISED PRODUCTS TEST INSTRUMENTS

101 109 117 125 133 141 149 900 908 316

102 110 118 126 134 142 150 901 909 317

103 111 119 127 135 143 151 902 910 918

104 112 120 128 136 144 152 903 911 319

105 113 121 129 137 145 153 904 912 '320

106 114 122 130 138 146 154 905 913 921

107 115 123 131 139 147 155 906 914 '322

108 116 124 132 140 148 156 907 915 923

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COMPANY

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POSITION

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STATE

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ELECTRONICTECHNICIAN/DEALERPOST OFFLE BOX 6016. LULU1H. YNNESOTA 55006

This card is usable until January 1, 1975.

For more information on products or services mentioned in this issue, simply circle the appropriatenumbers below, type or print your name and address, apply pcstage, and drop in the mail.

NEW PRODUCTS

700 708 716 724 732 740

701 709 717 725 733 741

702 710 718 726 734 742

703 711 719 727 735 743

704 712 720 728 736 744

705 713 721 729 737 745

706 714 722 730 738 746

707 715 723 731 739 747

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For those r ountws outside the II. S, ple t,e apply appropriate pc stage belnre mad.nw.

['ROM I MSSOL Li 1 IONS

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ELECTRONICTECHNICIAN/DEALERPOST OFFICE BOX 6016, DULUTH, MINNESOTA 55806

PLACE

STAMP

HERE

READER SERVICE INFORMATION CARD 10-74

GET

MORE

FACTS

This card is usable until January 1, 1975.

For more information on products or services mentioned in this issue, simply circle the appropriatenumbers below, type or print your name and address, apply postage, and drop it the mail.ADVERTISED PRODUCTS TEST INSTRUMENTS NEW PRODUCTS

101 109 117 125 133 141 149 900 908 916 700 708 716 724 732 740

Circle

the

Reader102 110

103 111

118

119

126

127

134

135

142

143

150

151

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902909 917

910 918701

702

709

710

717

718

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726

733

734

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121

122

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145

146

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154

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107 115

108 116

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706

707

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731

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747 of those

NAME POSITION items ofCOMPANY STREET interestCITY STATE ZIP CODE

to you.Please describe your type of business or industry

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BUSINESS REPLY MAILNO POSTAGE STAMP NECESSARY IF MAILED IN 7..t

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Circulation Department

ELECTRONICTECHNICIAN/DEALERPOST OFFICE BOX 6016, DULUTH, MINNESOTA 55806

FIRST CLASSPERMIT NO. 665E.JLUTH MINNESOTA Your own

personal

copy

for

only

pennies

per issue

1553SYMBOL DESCRIPTION SYLVANIA PART NO - nr 110M V.rw THAr.SISro4 dAs-05,

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control tone IT2877P) 63-10302R256 -150K, control vert hold 1T2877P) 63-10500R310 - 40K, control volume IT2877P) 63-7996

convergence assembly complete (T2877F9 S-94680deflect yoke IT2877N 95-3103pilot lamp bulb UHF IT2877PI 100-368pilot lamp bulb VHF 11-2877P1 100-368tuner VHF 1T2877P)

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DUMMYLUG

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COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802

1551ELECTRONIC 17 /1--$=77TECHNICIAN/DEALER /

COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

QUASARColor TV Chassis17TS-941, C19, E19,19TS-941

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CIRCLED RUMMERS° REFER To WAVE FORMS

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PRODUCT SAFETY SHOULD BE CONSIDERED WHEN A COMPONENTREPLACEMENT IS MADE IN ANY AREA OF A RECEIVER. THE SHADEDAREA OF THIS SCHEMATIC DIAGRAM AND THE PARTS LISTDESIGNATE COMPONENTS IN WHICH SAFETY CAN BE OF SPECIALSIGNIFICANCE. IT IS PARTICULARLY RECOMMENDED THATGENERAL ELECTRIC CATALOGED PARTS BE USED FOR COMPONENTREPLACEMENT IN THE SHADED AREAS OF THIS SCHEMATIC.

USE OF SUBSTITUTE REPLACEMENT PARTS WHICH DO NOTHAVE THE SAME SAFETY CHARACTERISTICS AS RECOMMENDEDIN FACTORY SERVICE INFORMATION MAY CREATE SHOCK. FIREOR OTHER HAZARDS.

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7_TILF=LPICOMPLETE MANUFACTURER S' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

SCHEMATIC NO. SCHEMATIC NO.

AIRLINE 1549 SYLVANIA 1553TV Model GEN11965A TV Chassis Al2-3, 4, 5

GENERAL ELECTRIC 1550 ZENITH 1552Color TV Chassis QB

QUASAR ELECTRONICS CORP. . . .1551Color TV Chassis 17TS 941, C19,619, 19TS-941

Color TV Chassis 17FC35

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OCTOBER 1974

1549AIRLINETV ModelGEN11965A

SYMBOL DESCRIPTION AIRLINE MODEL NO.

R254 -10K RF AGC J25635R266 -1K AGC P125511R303,S1N901 - 10K volume w/on-off switch J25636R608 - 100K vert hold J25637R614 -5K vert bias J25638R624 -50K Vert size J25639R625 -1K vert lin J25640R810- 1K contrast J25641R813 -250K brite J25642R903 -1K voltage adjust J25643L301 -coil sound detect J611143L701 - coil horiz hold .1611141L801- coil 4.5MHz trap TV622581401 - xformer audio output J62762T601- xformer vert choke N11169T701 - xformer horiz driver J62763T702- xformer horiz output incl SR702 J62764T901 - xformer power J62765M208 -filter pix detect J611140TH251 -therm AGC J241263TH601 -therm vert J241264TH901 - therm B + J241264VDR601- voltage dependent resistor vert TV24250VR601 - varistor verl J241261VR701 - varistor horiz J241261F901 -fuse 0.75a, 250v, slo-blo pigtail J18512F902 -fuse 3a, 125v slo-blo pigtail 315003F903 - fuse 2a, 125v slo-blo pigtail 315002

tuner UHF J35447tuner VHF J35446yoke deflect J611145

1507KIP

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$0.21/ }0171500

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INCTURCTIME

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AC I 2006002

COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN /DEALER 1 EAST F I RST STREET. DULUTH. M I NNESOTA 55802

LEADER'Now' Color Bar

Generators

1

some rreown OF 1 1=1

4 all11111111111X0Pr)

MODEL LCG-384 MODEL LCG-388 MODEL LCG-395 MODEL LCG-391MINi-PORTABLE. THE ULTIMATE IN WITH STAIRCASE, SOLID STATEBATTERv-OFERATED. PATTERN STAEIUTY WINDOW, ACCURACY WITHSOUL. STATE THROUGH CONVERGENCE & WHITE PURITY

PREC S ON DIGITAL ACCURACY WHITE RASTER ADJUSTMENT

They make your toughest jobs a lot easier!

$159.95 $199.95 $299.95 $129.95High quality test patternsthrough our exclusive digita.clock binary system! Uses justfour 1.5V penlight cells, is ACadaptable and fits into all tubecaddies. -las 2 pushbuttonselectable 'requencies. 8 basicpatterns. w.th gated rainbow;and temperature change pro-tection. Includes carry case.extra battery comp't and allaccessor es.

The finest available thanksto our unique digital ciock.binary frequency divider.Features: lab grade per-formance in 15 patterns forboth RF and video frequencieswith single dot and cross-hatch; two switch selectablechannels; regulated DC powersupply and ambient tempera-ture control. All accessories

An exciting solid state first fortesting CATV. MATV, CCTV.VTR & NTSC receivers. With5 -step staircase, window, con-vergence & white purity adj.Offers complete rainbow spec-trum, 10 gated rainbow pat-terns & 3 gated bar patterns.Features IF. RF and compositevideo outputs and yoke polar-ity checker. Includes gun killerleads and cables.

LEADER"Put Us To The Test"

Binary clock. cigital .0 3delivers 6 extra sharp. extrastable patterns and whieraster for purity checks 2 sw.select freq.s. vert & hztl returntrace blanking. flickeriess nztllines & square crosshatch forlinearity. Uses offset hype colorbars. Very compact, very I ght-weight. very practical. With RFcable and carry case.

Instruments Corp. 151 Dupont St., Plainview. L.I N.Y. 11803 (516) 822-9300

. . for more details circle 119 on Reader Service Carc

The easy-to -read630 makeslearning easy.The Model 630 V -O -M is pricedat a thrifty $72.

The rugged, general purpose TriplettModel 630 is the kind of dependableV -O -M that both teachers andstudents appreciate. And for the samereasons the electronic and electricalmaintenance professionals do.Uncompromising accuracy. Sturdylightweight (only 3 lbs. with batteries).Simplified single switch operationholds errors to a minimum, and diodeoverload protection for the metersuspension movement reduces thechance of tester damage whenmistakes do occur.

With long, clean scales covering 27ranges in only four arcs, the TriplettModel 630 is remarkably easy -to -read.

It's packed with major features:1 Diode overload -protected

suspension movement V -O -M;single range switch minimizeserror.

2. 4 Ohmmeter range with 4.4ohms center scale.

3. Simplified scale-only 4 arcsfor all 27 ranges.

Sensitivity is 20,000 Ohms per VoltDC, 5000 Ohms per Volt AC.Accuracy is an excellent 2% on DC,and 3% on AC. Measures resistanceto 100 megohms, with 6,000 VoltAC and DC capability.Handles DC microamperes 0-60, andDC milliamperes 0-120, both at 250mV, and can read DC amperes 0-12.

CAUTION ON HIGH V3LTS

60001200

Rugged black molded plastic casewith removable black leather carryingstrap. All this for just $72.Get the same convenience andoperating advantages plus 11/2% DCaccuracy and mirro-ed scale with theTriplett Model 63C -A, priced atonly $83.

For more information or a freedemonstration, call your Triplett

60001200

-aoo-60

-12

-) 10-X 1000

-x 100 000/114

sf 007'UT

distributor or sales -epresentat ve.For the name of tie representativenearest you, cial to.I free (800) 645-9200. New York State, call coilect(516) 294-0990. T-iplett Corporation,Bluffton, Ohio 458' 7.

MrTRIPLETTALL YOU'LL EVER WEED IN '0, -0 -M's

Triplett. The easy readers.. for more details circ e 130 on Reader Service Card

october 1974 75 cents [pp a harcourt brae jovanovich … · imp 0. electronic technician/dealer...

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