cu lat ion - americanradiohistory.com...p.0 box 5794 san diego, calif. 92105 tel. 714.230.1010...

NOVEMBER 1973 7E CENTS M-1 A HARCOURT BRACE JOVANOVICH PUBLICATION

ELECTRONICTECHNICIAN/DEALER

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Correcting those Mistakes

Zenith's Titan Color -TV Cnassis

Zooming in that Station

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PHILLIP DAHLEN, CETEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511

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

TOM GRENEYPublishing DirectorJOSEPH ZAUHARManaging EditorLINDA EISNACHProduction ManagerJOHN PASZAKGraphic DesignLILLIE PEARSONCirculation FulfillmentGENE BAILEYManager, Reader Services

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

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ELECTRONICTECHNICIAN/DEALERNOVEMBER 1973 VOLUME 95 NUMBER 11

Gerald O'Geay of Jerry's TV is shown on this month's cover with his solution to the cur-

rent fuel shortage-using his motorcycle to make house calls and the truck only if itbecomes necessary to bring the set in.

7 EDITORIAL: We Need Help!

8 LETTERS: Pertinent comments concerning past issues.13 READER'S AID: What you need or have for sale.16 NEWS: Events of interest to our industry.22 NEW AND NOTEWORTHY: Merchandise of special interest.

FEATURES

25 TEKLAB REPORT

First-hand observations when examining Zenith's Titan 300v Vertical Color -TVChassis in our electronics lab.

29 A LOOK AT THE 1974 TV SETS -PART II

The second of a two-part preview of new color -TV sets that you may be sellingand/or servicing next year.

34 USE UTMOST CARE IN CORRECTING THOSE MISTAKES

Ernest W. Fair tells of some of the techniques that can be used to improve customerrelations, even when a mistake does occur while serving a customer.

35 TAKE THE TIME -REPAIR IT RIGHT -CHARGE WHAT IT IS WORTH

Bob Cook tells how work habits can ei:her make a company grow or destroy it.

40 ZOOMING IN THAT STATION

Some told us that this antenna was too good to be true, but we find it meets ourhigh expectations.

44 TEST INSTRUMENT REPORT

Reviewing specifications for Triplett's Model 8035 Dig tal VOM.

46 COLORFAX: Tips for easier color -TV set repair.

49 TECHNICAL DIGEST: Hints and shortcuts for more effective servicing.52 NEW PRODUCTS: Instruments and components to make your job easier.58 DEALER SHOWCASE: These items may increase your sales revenue.

60 TECHNICAL LITERATURE: Informative material that you may need.62 ADVERTISER'S INDEX: Manufacturers concerned about you.63 READER SERVICE: A source of additional information.

65 TEKFAX: Up-to-date schematics for easier servicing.

[I0 A HARCOURT BRACE JOVANOVICH PUBLICATION lit O

HARCOURT BRACE JOVANOVICH PUBLICATIONS: James 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. Sing e copies: 750 in the U.S.and Canada; all other countries $2. Second class postage paid at Duluth, Minnesota 55806 andat additional mailing offices. Copyright © 1973 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.

4 I ELECTRONIC TECHNICIAN/DEALER, NOVEMBER 1973

Stocking these 9 ECGT"semiconductorsis like having hundreds of high -voltage

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NOVEMBER 1973, ELECTRONIC TECHNICIAN/DEALER 5

B&Kintroduces two ways to make

troubleshooting easier.Few things are handier ona troubleshooting job thana good substitution box.That's why B &K takespride in introducing ournewest and handiest sub-stitution boxes-at pricesyou wouldn't expect.

Our new Model 2901is an ultra -compact, 36 -component box with fullprotection for the circuits,the components, and you.It features a high -capacity(1000 mfd), low -voltagecapacitor for transistorizedcircuits, and a special surgeprotection circuit that pre-vents arcing and healing ofelectrolytics. And it's allin a rugged box weighingonly PA pounds.

$7495(Model 2902)

Our new Model 2902Substitution Master givesyou an array of 76 most -needed resistors and capac-itors, including 20 elec-trolytics with special capa-bility for transistorizedcircuits-plus a dioderectifier. Its special surgeprotection circuit reducesproblems by preventingarcing and healing of elec-trolytics; low -voltageelectrolytics are protectedby a front -panel overloadindicator. The 2902 letsyou select up to 5 com-ponents for simultaneoussubstitution, includingsignal and power resistors,paper/disc and electrolyticcapacitors.

Thus you can make upa simple but complete

power supply circuit, in-cluding bleeder and powerresistors, filter capacitors,and the rectifier. Or youcan make up a voltage di-vider by selecting the 2resistors of the desiredvalues. For their capabil-ities, our Models 2901 and2902 Substitution boxesare the best values onthe market today.

Whichever youchoose, we think it willprove to be one of yourmost valuable trouble-shooting tools. And that'sjust what you'd expectfrom B & K.

Contact your distribu-tor, or write DynascanCorporation.

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/B Very good equipment at a very good price.Product of Dynascan Corporation/1801 W Belle Plaine Ave., Chicago, III. 60613

. . . for more details circle 103 on Reader Service Card6 ELECTRONIC TECHNICIAN/DEALER, NOVEMBER 1973

EDITORIAL

We Need Help!

In last month'seditorial I wroteof the increasedsophistication ofsolid-statecircuitry and theautomaticclosed -loopcircuitry that isnow providingautomatic controlsmuch in demand

by the public-which still seems to lackthe necessary basic skills to manuallyadjust their color -TV sets for a goodpicture. There is great competition onthe part of TV -set manufacturers to meetthis demand. However, much of thiscircuitry is far too complex for many oftoday's electronic technicians and thusthe great merit of today's modulardesigns, which permit the repair of TVsets by a technique of substituting goodmodules for bad ones. That editorialpraised the modular concept for therelief that it currently provides duringour present technological gap-plus theadvantage of being able to do intricatework on components outside the chassisin a more convenient location, shouldone elect to repair defective modules.

So much for the compliments ... thismonth we will concentrate on theproblems.

Just recently (prior to the mailing ofthe October issue) I had a phone callfrom a contact that works in thesemiconductor division of a majormanufacturer that produces bothsemiconductors and TV sets. Besidesnow being associated with the design ofnew sophisticated semiconductors, heat one time was involved in the designof TV sets, and has also servicedthem in the field. He is up in armsconcerning the current state of ourtechnology! Although many of hiscomplaints are well known to all of us, I

will still list all of them that I can recall: When transistor circuits first came

on the market, manufacturers promotedthe myth that transistors virtually neverfailed or were at least certainly far morereliable than tubes. Thus the public waslead to believe that if one bought atransistor radio rather than a tube radio,you would probably never have to repairit. Although such claims are no longermade, the public still believes the myth.

(As an unusually extreme negativeexample, your editor purchased amodular solid-state color -TV set severalyears ago and has had more solid-statecomponents completely fail or gointermittent than he would care to evenattempt to count-while the hot,slow -to -warm-up, all -tube, color -TV setthat he purchased a year later has neverhad a single component failure andserves as a frequent substitute for theother set while under repair.)

Solid-state circuits, unlike tubecircuits, require precise work whenservicing. If something slips whenservicing a tube circuit, you can see atube plate glow red or trip a circuitbreaker without necessarily damagingthe circuit. However, when a technicianmakes a similar error while servicing asolid-state circuit, it is possible todestroy a whole hand full of transistorsin an instant without so much as a puffof smoke-before a circuit breaker evenhas time to function.

In some instances one defectivemodule can burn out another. Thus,when substituting modules as a servicingtechnique, the customer may be billedthe cost of additional modules that weredestroyed as the technician attemptedto locate the defective module causingthe problem.

Even when restricting one's effortsto but two or three name brands ofcolor -TV sets, the electronic technicianor service dealer may find himsell facedwith an extremely large inventory ofmodules-having to purchase forpossible use modules that are nevertaken off the shelf. Yet, if he doesn'tstock them, some manufacturers maynot permit him to do their warrantywork, or he may later encounter delaysin purchasing them should theyeventually be required.

Although each TV -set manufacturermay have modules that will fit in anumber of models in its product line,there is still a problem of moduleinterchangeability even when servicingbut one brand of products. And theup -dated circuits on the new modules ineffect make the old replacementmodules obsolete, even though both maywork in an older color -TV set (possiblyrequiring minor TV -set modification indoing so). There has been no attempt tostandardize modules amongst

manufacturers, let alone integratedcircuits. (Some standardization betweenbrands may inadvertently appear sincecertain 7V -set manufacturers are nowhaving their products marketed under avariety of brand names. Thus some setssold as competing brands A, B and C mayactually be manufactured by company B.)

Despite all the advances in modernTV -set circuitry, these TV -setmanufacturers have shown no apparentinterest in developing instrumentationto assist the electronic technician orservice dealer in his attempt to servicethese new circuits. As an example, thereis no instrument currently on the market-available to you, our readers-thatcan check even one of the integratedcircuits used in the TV sets that youmust service. We have tube checkers,transistor testers, but no complete ICtesters-let alone module testers.

Manufacturer efforts at trainingelectronic technicians (at leastaccording to my contact) have beeninadequate. Although it is true thatelectronic technicians and servicedealers must upgrade themselves forsurvival in their profession, if no onecan do an adequate job in servicing theirproducts, where will the TV -setmanufacturer stand tomorrow with thepublic and consumerism? Even if theybypass independent service and do theirown servicing, these manufacturers havefailed to develop the necessaryinstrumentation for effective localservicing by anyone.

As you might guess, my contact hasnearly had his head on the "choppingblock" a number of times, and his namewill remain confidential. However, someof his more general claims can besupported by another contact workingfor a TV -set manufacturer. The secondcontact is having a serious cost problem-first year part replacements arecutting heavily into sales profits.

Yes, we as electronic technicians andservice dealers are faced with seriousproblems and we must have the help ofTV -set manufacturers in order tosuccessfully overcome them. Moduleshave helped, technical literature andpublications have helped, so haveseminars conducted by manufacturersand our trade associations. However,these are only serving as temporary

continued on page I I


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8 I ELECTRONIC TECHNICIAN/DEALER, NOVEMBER

LETTERSReader comments concerning pastfeature articles, Editor's Memos, previousreader responses or other subjects ofinterest to the industry.

Provides Several CommentsConcerning August Issue

Your cover picture of your electron-ics lab made me feel like donating anold tube checker, but I see on page 31that you do have a little bit of testequipment, in addition to file cabinets.

The article, "Innocent Dealer Ar-rested," on page 32 makes the maga-zine, NEA and NATESA worthwhile.

I first read the Letter to the Editorfrom Fred Hall who wants more tech-nical articles. He should realize thatwe are running a business, and thatwhile expertise is necessary, in the longrun, customer satisfaction is more im-portant that knowing which way theholes and electrons run in a transistor.

MONTY HUCKLE, CET

Some Thoughts ConcerningService Dealer Arrested

Concerning the article, "InnocentService Dealer Arrested," in the Au-gust 1973 issue: Did Mr. Sabosto everget any kind of an apology or remu-neration of any type for all of the an-guish? I would think that he could goafter that testing laboratory! From thecourt transcript it would appear thattheir findings were exactly what some-one told them to find out! It wouldappear to me that the same media thatpublished the original "expose" shouldalso print this court transcript. I reallycan't find decent words to describe myfeelings about that D.A. I would liketo hear from others on the matter.

PETE DALEYWe received a great deal of compli-

mentary reader comment concerningthis article at the NATESA/ NEA/ISCET conventions in Kansas City,Mo., last August. Additional readercomments are most welcome. At thatconvention your editor also had an in-teresting visit with Henry Wawryck,who testified for Mr. Sabosto.

Please read again the report sub-mitted by the New York Testing Lab-oratories. It doesn't say that a resistorwasn't replaced, it says: "However, itdoes not appear obvious that a resistorwas replaced." So far as your editorknows, all that Alex Sabosto receivedat the completion of the trial was acourt decision in his favor-this wasnot a lawsuit, so he received nothingelse for his trouble. What with the ex-

1973

pense of having to defend himselfagainst charges pressed by the D.A.,your editor doubts that Mr. Sabostowould be in a financial position to hirelawyers for a suit against the D.A. orTesting Laboratories. Yes, the news-paper did cover the story that his in-nocence was proven-back somewherein the paper where no one would both-er to read it. To be arrested makesnews, to be innocent doesn't! Theseare the cold hard facts in this world inwhich we live.

Remember, seven shops werecharged by the D.A. with fraud andMr. Sabosto was the only one to seekassociation help. It is quite possiblethat the others were innocent also, butfeeling unable to defend themselves,pleaded guilty to save the expense ofhiring a lawyer. We don't know, weare only guessing.

However, your editor has heardfrom competent sources that both theFederal Trade Commission and D.A.'sin various parts of the country are inthe process of running similar spotchecks, like the one that entrappedMr. Sabosto. We hope that with theAugust article those that may be en-trapped will be better able to defendthemselves.

This again only proves that we mustall stick together if we are to make ago of it. That is why your editor be-lieves so strongly in professional as-sociations! Ed.

Reader Comments ConcerningBasic Digital Circuitry Article

I enjoyed your series on Basic Digi-tal Circuitry and will look forward tofuture articles.

I would like to call your attentionto a piece of equipment similar to theHewlett Packard Logic Clip that isavailable at a fraction of the price. It'scalled the Digi-Viewer made bySouthwest Technical Products of SanAntonio, Texas. It contains 32 Dar-lington connected transistors andbright 5v lamps. With additional com-ponents, also available, it makes agood out -of -circuit tester. Catalogsheet enclosed.

JAMES T. SELF

I Have Liked Your AttitudeYou are a busy editor!I liked your editorial very much in

the May ELECTRONIC TECHNICIAN/DEALER magazine I just received. Ihave liked the fair and reasonable at-titude you have shown.

I wish I was smart enough to merita CET after my name. Perhaps I amtoo lazy to get that. I am 71 years old.

Perhaps you are appreciated by the"screwdriver mechanics" like me morethan you know. They are a peculiar,independent bunch.

Best wishes for your continued suc-cess. We need leaders like you.

DAVID THOMAS

Pro's and Con's ConcerningThe CET Program

I have for some time now beenreading with great interest all the pro'sand con's concerning the CET Pro-gram.

I have worked mostly on a part-time basis for over six years on homeentertainment products for both my-self and a service shop. My full-timefield is broadcast engineering, present-ly transmitter supervisor. I am a CETand hold a First Class FCC licensewith radar endorsement.

I am as much or more proud of theCET title than the FCC license. Yes,I studied hard and while attending thewonderful JESUP Program seminar inIndianapolis, Ind. I took the CET testand passed. In fact, I would suggestthat anyone considering the FCC examshould take the CET test as a pre-requisite. I found the CET exam onthe same level as Element III of theFCC exam for a Second Class license.

One may wonder why a full-timebroadcast engineer becomes so inter-ested in the CET exam and trainingseminars. I have found that attendingservice training seminars have helpedkeep me up to date on troubleshoot-ing and basic theory, and also I learnabout the latest devices and products.Also I can listen to problems which Imay have a direct relation with. Don'tforget that awful color pictures don'thave to be the set-it could be thesending end.

I agree with Mr. Cmielewski, whyshould anyone scorn the CET Pro-gram? It's the best bet on your fu-ture.

I also agree with your constant ad-vice that we all should attend thoseseminars, you and me. This field ofelectronics is changing at such a fastpace that yesterday's dream is today'sreality. Either we keep up to date orwe'll be sweeping up museums.

THOMAS M. WIMBERLY, CET

Given Credit for PublicityProvided Glaring Case ofMisguided Justice

I give you credit for giving publici-ty to this glaring case of misguidedjustice. This smacks of the German

continued on page 11

END OF THEREPLACEMENTTRANSISTORNIGHTMAREjust 47 transistors replaceover 22,500 O.E.M. part numbers.

Finding the right replacement transistor has been a real

toughie for most service technicians. Over 22,500 existing partnumbers have made life difficult. Now, they can be replacedwith just 24 small -signal, 18 power, and 5 field effect tran-sistors. You can gei any or all of the 'Fantastic 47' on the self-service Semiconductor Q -Mart at your Sprague distributor's.While you're there, pick up a free copy of the 48 -page K-500Semiconductor Replacement Manual. Or . . . write to SpragueProducts Co., 65 Marshall St., North Adams, Mass. 02147.

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THE BROAD-UNE PRODUCER OF ELECTRONIC PARTS. . . for more deta Is circle 127 on Reader Service Card

NOVEMBER 1973, ELECTRONIC TECHNICIAN/DEALER 1 9

SPRAGUETHE MARK OF RELIABILITY

Announcingthe Panasonic Parts Hot Line.The New Panascric Parts Hot_ine is a performance promise:24 -hour -a -day, 7 -day -a -weekservice. Now, if you have a prob-em getting the part you need,.ust call one central number.

Then things start happening-ast: we'll ask our computer tolocate your part :IN parts) bysearch ng all five regional Pana-sonic parts depots. In just sec-onds. Electronics ly. Then we'lltelex art order to :he depot whichhas the part you need and within

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We know that your businessdepends upon having the ritghtparts at the right time - whenyour customer needs 7hem.Ourbusiness is standing right behindyour business, with ci.ality partsfor over 1,000 products.

LETTERS ...continued from page 9

Gestapo.In my opinion the testing lab dis-

played incompetence. They apparent-ly contended that only a test of thefaulty tube was necessary, and that allother tests and maintenance opera-tions were superfluous. Of course theywere aware that they had removedthat one tube, beat it to death, andthen replaced it in its original posi-tion. But how was the service techni-cian to become aware of that fact? Inmy opinion the lab again displayed itsincompetence by ducking the issuewith the statement, "It is not obviousthat a resistor has been replaced."

I feel that the D.A. in turn dis-played his incompetence when he in-terpreted the above statement to say,"It is obvious that a resistor has notbeen replaced." What would have beena more logical decision by the D.A.would be "not guilty by reason of in-sanity." Any service technician whowould attempt to cheat a customer ona one -Meg. resistor is truly insane.

It appears that at no time duringthe events leading to the arrest was acompetent service technician called into rate the quality of service per-formed.

Did the D.A. make a public apologyfor false arrest? Did he humbly seekto make amends with some monetarycompensation such as a $1000 crediton future taxes? If not, why not?Should not the authorities assume re-sponsibility for their mistakes as anordinary citizen is expected to?

What more can be done to assurethat this tragedy will not be repeated?Is there something that I can do? Ihave distributed copies of your articleto knowledgeable associates. The endresult of such injustices repeated willhe to give less value to the customer-the exact opposite of the intendedgoal.

I hope that you can pass the wordto Mr. Sabosto that there are lots ofus out here who stand solidly behindthe Mr. Sabostos and are ready tostand up and be counted.

RICHARD H. KAUFMANNIn this country "justice" does not

include either an automatic apologyfrom a D.A. or tax credits to coverthe expense of defending one's self.Mr. Sabosto might wish to sue, hutthat could also be expensive and re-quire the time now needed to get thestore back on its feet.

One local association in your statecontacted a number of local D.A.'sand advised them of the pitfalls in at-tempting to do a "Clean-up operation."

They all agreed never to do such athing, at least without association as-sistance, and then a few months laterone of those D.A.'s broke his promiseand did just that.

If electronic technicians and servicedealers do not get together to lookout for one another's interests, no onewill. That is why I believe so stronglyin the importance of such organiza-tions as NATESA, NESDA andNA RDA. Ed.

Reader Suggests Design ofTechnicians' Third Hand

This little third hand, constructedof old parts in about two minutes, hassaved me a lot of time. It's great for

001"

ot,Vfel6

0/10-

holding cartridge wires while solderingthose little connectors to them, andalso resistors, etc., etc. I would likeyou to pass this idea on to my fellowtechnicians for me.

DEVON R. WROBLEWSKI, CET

EDITORIAL...continued from page 7

buffers for the real problem, which canbe solved only with greaterstandardization of components andmodules, more sophisticatedinstrumentation with which to servicethem, greater component safetytolerances, and more effective newservicing techniques.

I feel certain that just as our rapidlychanging technology has produced manyof these problems, future technologicaldevelopments by manufacturers-pressured by you, consumer groups andpersistent trade associations-willsolve them.

S:1 1101/1

AUTOMATIC

STAPLE GUNSCUT WIRE & CABLE

INSTALLATION COSTS. . . witoout cutting into insulation!SAFE! Grooved Guide positions wire forproper staple envelopment! Grooved DrivingBlade stops staple at right depth of penetrationto prevent cutting into wire or cable insulation!

No. T-18-Fits wires up to

NNil........3/16" in diameter.

BELL,TELEPHONE,

THERMOSTAT,INTERCOM,BURGLAR

ALARMand other lowvoltage wiring.

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

in 3/8" leg length only.

No. T25-Fits wires up to1/4" in diameter.Same tasic constructionand fastens samewires as 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.

No. T -75 --Fits wires and cablesup to 1/2" in diameter.

RADIANT HEATCABLE,

OF CABLE,WIRE CONDUIT

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

1 7/8" leg length

Arrow Automatic Staple Guns save 70% in timeand effort on every type of wire or cable fasten-ing job. Arrow staples are specially designed withdivergent -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.

02=1:131=3:1":Saddle Brook, Now Jersey 07663

"Pioneers and PacesettersFor Almost A Half Century"



How some tubes are rebuilt. How our color bright 85 REis rebuilt.

1. Inspect screen and replace electron gun.2. Reinstall safety glass.3. Test tube.

1. Completely clean old glass so it gleamslike new.

2. Apply new internal and external coating tothe bulb.

3. Replace phosphors with Sylvania high-brightness types.

4. As required, install new aperture mask withSylvania thermal compensation system.

5. Replace electron gun with Sylvania electrongun assembly.

6. Install new implosion protection system.7. Final test.

Every tube is remanufactured and testedon the same assembly line used for our newcolor tubes. And that line includes thelatest computer -designed improvements inscreen exposure optics. In short, when youinstall a Sylvania color bright 85RE picturetube, you are installing a tube that ispractically brand new except for the glass.In fact, if we rebuilt it any further, it wouldbe a new tube.

Available at your local Sylvania distributor.Sylvania Electronic Components,100 First Avenue, Waltham, Mass. 02154

CM SYLVAN IA

12 I ELECTRONIC TECHNICIAN/ DEALER, NOVEMBER 1973

READERS' AIDSpace contributed to help serve thepersonal needs of you, our readers.

WantedI would like to obtain CRT test

setup data for a No. CR-65 Adapterused with a B&K Model 466 TVTube Tester.

B. J. Kozo',P.O. Box 164Palo Alto, Calif. 94302

I need a type 24A tube for an oldZenith radio.

0. HICKSHicks Radio -TV Service1325 N. MockingbirdAbilene, Texas 79603

I would like to obtain parts and ser-vice data for Precision Model E410Sweep Generator/ Marker Adder,Crystal Osc., Marker Serial No. 1719.Paco Electronics, Model G-32 datawould also apply.

NICHOLAS TOWSTEGA322 Ave. Q SouthSaskatoon, Sask., Canada, S7M 2Y3.

I would like to purchase a KRK-49D tuner for an RCA CTC-9 Color -TV chassis. It must he in good or re-pairable condition.

JOHN W. COOK2909 Elmwood Ave.Erie, Pa. 16508

I would like a schematic or any ser-vice information for two old Philcoradios manufactured in the year of1940. One is a model 40-150 Code121, and the other is a Model 40-150.

TERRY SATRANG1215 N. Dakota, Apt. 6Aberdeen, S.D. 57401

I would like to obtain the followingViking stereo tape equipment. Model88 RMQ Deck and Model 86 Deckwith electronics. Will buy or trade theunits.

SUFFOLK AUDIO SYSTEMS350 Brookville Ave.Islip, N.Y. 11751

I am rebuilding some old radiosand need a 2A5 and a 58 tube.

EDDIE LEHMAN

Box 412Timmins, Ontario P4N-7E3

I would like to know where I canobtain speaker cones for reconing pur-poses.

N. B. VRAZEL605 Irvine St.Yoakum, Texas 77995

Business for Sale

I have a TV and appliance salesand service store for sale which in-cludes a four -room apartment and aseven -room furnished apartment. Allfurniture and equipment are also in-cluded. Please write for details.

ED SWEENEYPost Office Box 3803Springfield, Mass. 01101

I have for sale an established TVservice shop in a good central locationin an Orange County, Calif. shoppingcenter. Priced for fast sale due to re-tirement.

P. C. ALAIMOA & G Electronic Service10062 Cunningham Ave.Westminster, Calif. 92686

Business WantedI wish to purchase a service busi-

ness in southern California area. Pre-fer a business doing $200,000 a yearor more.

A. G. STALSEPSuite 4076355 Topanga Canyon Blvd.Woodland Hills, Calif. 91364

For SaleI have for sale 190 Sams Photo -

facts, No. 51 through 1113, at $1.00each or best offer for lot.

WILLIAM MCINERNY1941 Old Frederick Rd.Catonsville, Md. 21228

I have for sale a 40 years accumu-lation of hard -to -get obsolete tubesfor $1.00 each plus postage.

H. C. BROWNP.O. Box 1111Goldsboro, N.C. 27530

PUT YOURTEAM

ON THEBRIGHT SIDE

Whether it's your favorite foot-ball team or your sales team,ANTENNACRAFT scores withtouchdown reception from totalperformance antennas.

WHY NOT get on the winningside - ANTENNACRAFT pro-vides the products and serviceyou deserve.

For information write to:

AntennacraftP.O. Box 1005Burlington, Iowa 52601



Which color TVneeds

fewest repairs?

Here are the questions and answers from a nationwide survey.

QUESTION: "In general, of the brands youare familiar with, which one would you sayrequires the fewest repairs?"

QUESTION: "In general, of the brands youare familiar with, which one would you sayis easiest to repair?"

ANSWERS: Zenith 35% ANSWERS: Zenith 37%Brand A 14% Brand A 24%Brand B 11% Brand B 13%Brand C 5% Brand C 5%Brand D 3% Brand D 4%Brand E 3% Brand E 3%Brand F 2% Brand F 3%Brand G 2% Brand H 2%Brand H 2% Brand G 1%Brand 1 1% Other Brands 2%Other Brands 2% About Equal 11%About Equal 13% Don't Know 4%Don't Know 11%

HOW THE SURVEY WAS MADE.For the second consecutive year, one of the best known researchfirms in America conducted a study of independent TV servicetechnicians' attitudes toward brands of color television.

And again Zenith was the number one brand named inanswer to each question, as shown in the charts.

Telephone interviews were conducted with TV servicetechnicians themselves in April, 1972. and again in April, 1973, inmore than 170 cities from coast to coast.

To eliminate the factor of loyalty to a single brand, the studyincluded only shops which serviced more than one brand of TV.

Survey details are available on request. Write to:Zenith Radio Corporation, 1900 N. Austin Ave.. Chicago, III. 60639

14 ELECTRONIC TECHNICIAN/DEALER, NOVEMBER 1973

Again this year,TV service technicians

say Zenith.

QUESTION: "In general, which of thebrands you are familiar with is the highestquality color TV?"

QUESTION: "If you were buying a newcolor TV set for yourself today, which brandwould you buy?"

ANSWERS: Zenith 45% ANSWERS: Zenith 35%Brand A 24% Brand A 23%Brand B 10% Brand B 12%Brand C 6";, Brand C 6%Brand G 5";, Brand D 4%Brand E 4% Brand E 4%Brand F 3% Brand F 3%Brand D 2% Brand G 3%Brand H 2% Brand H 2%Brand I 1% Brand I 2%Other Brands 3% Other Brands 5%About Equal 8% Don't Know 8%Don't Know 4% NOTE: Answers total more than 100% because some

service technicians named more than one brand.

The quality goes inbefore the name goes on


-GC ELECTRONICSCALECTRO

test metersirpo

21 RANGE F.E.T.MULTI -TESTERSolid State V.T.V.M.with decibel scale.

22 RANGE"BENCH -STYLE"MULTI -TESTERwith decibel scale.

18 RANGEMULTI -TESTER"Pop-up" metermovement.

GsELECTRONICS

CALECTRO-A LOTOF METER FOR

YOUR MONEY

1 1, 1 "Lt.INSTANT

REPLACEMENTWARRANTY

GC ELECTRONICSDIVISION OF HYDROMETALS, INC. 0ROCKFORD, ILLINOIS 61101 U.S.A.

NEWS OF THE INDUSTRY

NESDA Announces Plans for1974 Hawaii Convention

The National Electronic Service Dealers Association(consisting of the former membership of NEA plus someformer members of NATESA) has announced its 1974convention plans. These plans include the following:

NESDA will hold its first annual convention August 7through 11, 1974 at the Kauai Surf Hotel on KalapakiBeach, Kauai, Hawaii.

Following that convention, ISCET (International So-ciety of Certified Electronics Technicians) will hold itsfourth annual Technicians Convention August 12 and 13,1974 at the Kuilima Hotel on North Shore, Oahu, Hawaii.

NESDA will also conduct a one -day Business Manage-ment School August 15, 1974 at the Princess KaiulaniHotel on Waikiki Beach, Honolulu, Hawaii.

NESDA's first offshore convention is arranged to allowelectronics servicers a maximum of time to visit theHawaiian Islands, while enjoying the company of fellowdealers and technicians, and also take advantage of tourrates and tax savings.

Attendees may also register for the ISCET Conventionand the Business Management School, making their Islandvisit as long as 10 days. Or, they can register for theNESDA association meetings only and spend as little astwo days.

Annual meeting business will take up only a portion ofeach day-allowing families plenty of time to sightsee-take pictures-and visit.

Manufacturers and suppliers may participate by sponsor-ing meal and entertainment functions and by scheduling aconference room for individual consultation with the ser-vice dealers, primarily during August 9 through 11, 1974.

Complete registration and schedule information will bedistributed in December to all members of NESDA andISCET, and to all associate member companies.

Zenith Radio Corp. WarnsOf Possible Fire Hazard

,

Zenith Radio Corp has announced that analysis of fieldreports indicates a fire hazard may be present in some of12,000 19 -in. (diagonal) color -TV sets produced betweenJune 19, 1972 and August 15, 1972. Most of these modelswere sold during the summer and fall of 1972.

Owners who purchased 19 -in. Zenith color -TV sets candetermine if they have one of the affected sets by checkingfor the model, run number and serial numbers, which areprinted on a white label affixed to the back of the receiver.Those models affected are: D4030W5, D4030W6,D4032W5, D4034P6 and T2838W6. Not all sets of thesemodels are involved. Those having the potential defectwill have a run number of 226C or 227C and also a serialnumber in one of the following series 6505665-6508999,6513900-6514999, 6525385-6526999, 6527000-6529999,6536000-6539427, 6550000-6550669, 6553000-6553720.

Nathan W. Aram, vice president of consumer affairs,said, "The company is taking immediate steps to notifyowners of the receivers. Owners are advised to unplug thesets and not to use them until they are inspected and re-paired, if necessary."

The safety defect, which could produce a fire hazard, in-volves an improper location of a high -voltage capacitor insome percentage of the receivers.

Mr. Aram said that Zenith's National Service Depart-ment is issuing detailed instructions to distributors, dealersand service technicians on inspection and repair procedures.

. . . for more details circle 115 on Reader Service Card

16 ELECTRONIC TECHNICIAN, DEALER, NOVEMBER 1973

r Our tests show that

JERROLD Super lit -Finders And

Paralogs Outperform All Others MORE GAIN & FLATTER RESPONSE RUGGED AND EASY TO INSTALL ELECTRICALLY GROUNDED

WE WANT YOURPROF I NAL OPINION.

(TOOLSNOT

INCLUDED)

FREE! HEAVY DUTYLEATHER TOOL POUCHLast year we offered NFL Coffee Mugs for trying

Jerrold antennas. This year it's Tool Pouches. Why do wemake these offers? Because we know that once you stackJerrold antennas up against the antennas you are using now,you'll switch to Jerrold. Hundreds of dealers switched lastyear.

If you're a professional antenna installer, you owe it toyourself to make this evaluation.

FOR EVALUATING ANY SUPER VU-NDER OR PARALOG 300 PLUS.

JERROLD ELECTRONICSCORPORATION at 7MI

P. 0. Box 350,Dept. DSD, 200 Witmer Road, Horsham, Pa. 19044

Please send me a free Tool Pouch. Enclosed IS an Instructionsheet from the following Super VU -Finder antenna.

(model)

1 Before trying the Super VU -Finder, I was using the following antenna:(make) (model)

2 In my opinion the Super VU -Finder is: 0 BETTER 0 WORSEbecause:

3 Comments:

NAMECOMPANY NAMEADDRESSCITY STATE ZIP

COUPON MUST BE POSTMARKED BEFORE DEC 31, 1973 ##.. for more details circle 119 on Reader Service Card


CI

.1

Olj II IP Pa( r;': 4(

ri

Kit...or:: Heath test equipmentitt, is your best buy

I I I

r 4 1 !

yo

7

Kit and assembled instrJmentsavailable across the country

at Heathkit Electronic Cente-'s:ARIZ.: Phoenix: CALIF.: Anaheim, El Cerrito, Los Angeles,Pomona, Redwood City, San Diego (La Mesa), WoodlardHills' COLO.- Denver; cONN.: Hartford (Avon)' FLA.: Mi-ami (Hialeah;, Tampa; GA. Atlanta; ILL: Chicago. Down-ers Grove; INC.: Ind anapolis; KANSAS: Kansas City (Mis-sion); KY.: Louisville; ,A.: New Orleans; MD.: Bait more,Rockville; MASS.: Sos:on (Wellesley) MICH.: Detroit:MINN.: Minneapolis (I-cpkins); MO.: St. Louis; N FairLawn; N.Y.: Buffalo (Amherst), New York City, Jericho;L.I.: Rochester, White Plains; OHIO Cincinnati (Wood -lawn), Clevelard, Co umbus; PA.: Philadelphia, Pittsburgh;R I . : Providence (Wa.-wick); TEXAS: )atlas, Houston;WASH.: Seattle; WIS.: kliiwaukee.

Now you cal buy Heath test equipment ineasy-to-asse.mble kit form ... or factory-assembtec aid calibrated. Either way you getservice equiorrent with all the things Heathhas become famous for: high quality ... lowdirect -to -you prices ... trustworthy specifica-tions...long-term reliability...simple, ruggeddesign ... necessary features and functionsbuilt-in, not optional . . manuals with completeschematics, circuit descriptions, parts listsand operating instructions ... handsome brown& beige styling for our kits. striking black andwhite for the assembled versions ... and localsales and service at Heathkit Electronic Cen-ters in major metropolitan areas.And you get something else that's really moreimportant than excellent engineering or real-

istic prices: the total support andattention of everyone at Heath... honest, y, capable

\\\\\\WM\VAA\\\\\\\\\WN people sincefrrelyiendl

interested insolving your problems and

\\\In\\\\\\\\\\\\\\\\\\\\A\answering your questions.At Heath, "the customer

is always right" is not aslogan ... it's a way oflife.

AssembledEverything you need in servbe ecluipmeet... at the price youwant to pay. Our 21/2 -digit DMM (A), for instance, is just $79.95*as a kit, $120* factory -assembled. Prefer a VTVM? The famousIM -18 kit (B) is just $29.95"... only $55.95* for its wired counter-part. Our bench VTVM (C) is only S39.95* n kit form, $59.95* as-sembled. And our AC VTVM (0) is $41.95' as a kit, just $59.95*wired. Need a good scope? We have two... both loaded with fea-tures and priced right. The DC -15 MHz model (E) s

only $329.95' in kit form $475* wired. For$119.95* you can assemble our DC -5 MHz mod-el (F) ... for $179.95' we'll do it for you.If you do TV alignment, take a good look atour post marker/sweep generato- (G). Prob-ably the most versatile instrument available forthe price, it's only $139.95* as a kit, just $199*wired. Check out our color oar/pattern genera-tor too (H). The kit is just $79.95*; factory wi-edonly $114.95*. We have other generators too:our sine -square wave version is only $69 95* kit,$99.50 wired (I). And our audio generator (J) isequally low in price ... $49.95* kit, S74.95*wired. Power supplies? Our low voltage model(K) is just $79.95* as a kit $125* wired. Thehigh voltage model (L) is just $69.95* in kitform, $110* wired.Buy your equipment in kit form and enjoy maxi-mum savings. Or order it fac-tory -assembled & calibrated,ready to go to work for youright out of the box. Etherway, you get versatile,quality equipment at areasonable police. Or-der the instrument ofyour choice now ...or use the postcard orcoupon to send foryour FREE new Heathcatalog.

se!

.111141iHEATH COMPANYDept. 181-1'Benton Harbor, Michigan 49022

HEAT .1

Schiurnberger

Please send latest catalog.

Name

Company/Institution

Address

City State__

Mail order prices; FOB -actory

Z p

T E-295

. . for more details circle 116 on Reader Service Card

NEW AND NOTEWORTHYFor additional information on products described in this section, circlethe numbers on Reader Service Card. Requests will be handled promptly.

FOR MORENEW PRODUCTS SEE

PAGE 52

HAND TRUCK 700Collapsible unit for loads of up to 300 lb.

A collapsible, aluminum two -wheeledhand truck, called Tota/Ton, is designed

to transport loads up to 300 lb withoutstrain. The 15 -lb unit can be used at the

36 -in. height for moving short loads orextended to 54 -in. for taller loads. It

reportedly unfolds quickly, thencollapses to a flat 6 in. by 36 in. for car,

truck or other convenient storage.S & H Industries, Inc.

OSCILLOSCOPE 701

Laboratory features at a practical price

A new 15MHz scope, Model 1220A, is designed withcharacteristics ordinarily found only in laboratory scopes yetat a practical price ($625.00 for dual channel). Available insingle- and dual -channel models, they have deflection factors,i.e., sensitivity from 2 my/cm to 10v/cm. The CRT screenis large, 8 by 10 cm, with a 3% accurate calibrated verticaland horizontal display with a internal graticule. Other featuresinclude automatic triggered sweep, built-in TV syncseparation, automatic triggering on frame or line for convenientTV troubleshooting. The vertical and horizontal channels arematched so phase measurements may be made in the X-Ymode with phase shift of less than 3° at 100kHz. Thesolid-state chassis employs 16 integrated circuits. HewlettPackard.

SOLDERING GUN 702

Battery operated but willsolder 50 to 100 connections per charge

A new pencil, cordless soldering gun, Model 17,reportedly heats in only 5 sec and has a built-in

spotlite that lights up when the gun is in use. It hasa convenient trigger control with a work range

equivalent to a 15 to 25w pencil soldering iron. Theunit is operated on rechargeable nickel cadmium

batteries and will reportedly solder 50 to 100 connectionsper charge. It also features a plug-in charger that

can be operated even while soldering. Other featuresinclude handy, right-angle styling and a guaranteed

for life unbreakable case. Wen Produtcs, Inc.


Introducing theSolid State ofWorkman. Wheretheliving is easy

Workman's new WEP semiconductor line is, to say the least, uncomplicated.Our packaging does a lot of work for you: Cross-referenced to all major

lines right on the face of the card. Easy -reading model number and description.Blister -packed to protect what you're paying for.

The back of the card makes life easier too-basing diagram, full specs withsymbol and ratings.

WEP semiconductors are all fully warranteed so you can relax about that.About 200 WEP numbers give you one -for -one replacement against

competitive numbers and our complete cross referencing enables them toreplace up to 1000 numbers in other lines. ...

...., ..,,,

And when the big names fail you. W61"7 1N7. _ ..< Tit

Workman is waiting right there with HEP S3321, 53011 lir;S30/8, ',30I9

off -the -shelf delivery. 3030INP

NEDIUM POWERSILICON TRANSISEDR

In fact, that's pretty much the story on Z t?rrf.6 ett Nall Workman components: Uncomplicated.

In times, like these, who needscomplications?

Workman.Your first second resourcefor replacement components.

PIP S1077 WEP 33027

AUDIO POWER AMPLIFIER0,toc00..0 3,00.61 U.S0 Ual

Collexar Volt,. a '1.0 s0 35 Vie

4.......1.1.0.1 V°,10f CIO 33 11.1.

1,www44.4 V41.4.4 I Vt.* 4 34.Cal..,.. C...- 'C I S

1T0 Di100.0 --.-Fil0.01,1,01 C...N P.. ,r 30 4lCiwnw0 416 11.0101 04 110 Tr0,00.

C0414Iegnms .144.4N I ellREP 44.N.. NA

mwolociumes No.1444, .14414

Packaging on Workman's WEP Semiconducto stells you all you need to know -cross referenc ng,specs, basing diagram, symbol and ratings.

Workman Electronic Products. Inc. Box 3828. Sarasota. Florida 33578 A subsidiary of IPM Technology. Inc... for more details circle 132 on Reader Service Card


"IT WAS FANTASTIC:WHEN THE YELLOW PAGES CAME OUT,

BUSINESS ALMOST TRIPLED:Michael A. Cozzol no. A&M TV Sales and Service. Alameda, California

Doreen and Cozzoltno

"My wife Doreen and I havesure learned a lot in our 2 years inbusiness:' related Mr. Cozzolino."One thing is the value of being inthe Yellow Pages. Would you believe,our gross almost tripled the firstfull month after th? qd came out. Infact, it's brought us about 95% ofour business.

I guess we're doing somethingright, too: lately we've been getting a lot of repeat customers.We help out a little by offering discounts. And by lending TV setsto Navy families and retirees while we work on theirs. I like tohelp, because people have given me the chance to show what Ican do despite being blind and having one arm. I do just finewith special auditory test equipment and some assistance frommy wife.

And, of course, the Yellow Pages is my star sales repre-sentative. There's nothing likeit for bringing in new customers:'

3 OUT OF 4 PROSPECTS LET THEIR FINGERS DO THE WALKING.

YellowPages


ELECTRONIC TECHNICIAN/DEALER NOVEMBER 1973

TEKLAB REPORT

Zenith's Titan 300VVertical Color -TV Chassis

by Joseph Zauhar

A new Power -Sentry system employs a

magnetic rather than an electronic system of voltage

regulation for protecting all chassis circuitry

About nine and a half millionAmericans are expected to buy acolor -TV set this year and tablemodel color -TV sets arc still highon the list in demand.

The consumer buying a TV settoday will benefit not only from ad-vancements in technology and inno-vative set designing, but also from anincreased emphasis on consumerbenefits by manufacturers. One -but-ton tuning, brighter picture tubes,voltage regulation for increasedcomponent life and extended war-ranties are just a few examples.

After reviewing the new sets for1974, we received for lab purposes aZenith table color -TV set, ModelE4025W, employing a 19 -in. (mea-sured diagonally) screen. It em-ploys a Power -Sentry system ofmagnetic voltage regulation, Chro-matic tuning, Automatic Tint Guardand an advanced Chromacolor pic-ture tube.

Viewing the TV set from thefront, most of the customer tuningcontrols are found to be located onthe front control panel with the ex-ception of the PICTURE PEAKINGand HORIZONTAL HOLD controls,which arc located on the rear cabi-net panel. The Chromatic tuningsystem has a push-button switch lo-catcd at the top of the control panel.Pressing the button selects Auto-matic Tint Guard and factory pre-set adjustments of BRIGHTNESS,CONTRAST, COLOR LEVEL and TINT.

If you should want to change the

Chromatic color adjustment (fac-tory pre-set) for personal prefer-ence, it can easily be done from thefront of the TV set while viewingthe picture-which we feel is a goodfeature. Should you desire to changethe picture color -tones received, setthe chromatic color switch to ON

(the color switch will glow), anduse an insulated screwdriver tomake the following adjustments:First pry off panel cover emblemfor access to the panel -holdingscrew, then remove this screw andthe panel. To readjust the BRIGHT-NESS and CONTRAST level, insert aninsulated screwdriver into the holein the center of the customerBRIGHTNESS and CONTRAST knob.To adjust the color level, insert an

insulated screwdriver into the hole ofthe center knob in the COLOR LEVELcontrol and readjust for desiredcolor intensity. For TINT, insert thescrewdriver into the hole of the TINTcontrol knob and adjust for desiredfacial skin tones.

The TV set's back cover is easilyremoved by removing five standardI 1I -in.-in. screws-the antenna termi-nals stay intact with the cabinet.

Even at first glance, we wereamazed at the chassis-a verticalwall of easy -to -remove modules.The 19EC45 chassis employed isone of the three new all solid-statechassis used in the "E" line color -TV receivers. This chassis is used inthe new 19V and 2 3V models em-ploying the new type (29.6kv)Chromacolor II picture tube.

The vertical Titan 300V is oneof the most powerful chassis everproduced by Zenith for either itsbig- or small -screen color -TV sets.It is an expansion of the company'smodular solid-state circuitry thatbegan in 1969 with the use of dura-modules in the company's TV sets.

The Dura-modules are specialcarrier panels that mount and inter-connect solid-state devices in a de-sired circuit configuration. Themodules vary in size from singleones that are 31/2 in. by 23/4 in. tothe largest that measures 43/4 in. by31/2 in.

This chassis has five integratedcircuits, one more than last year.The newcomer includes the audioamplifier and sound -output stage.Each integrated circuit does the

Zenith's Model E4025W Chromacolor II color -TV set enploys a 19 -in. (measured diagonally)

screen.


Most of the customer tuning r3rt-ols are lo-

cated on the front panel wits ti e:ceptionof the PICTURE PEAKING aid IORIZONTALHOLD. The AFC, CHROMATIC ?nd )N/ ]FF arepushbutton type switches.

The Titan 300V is one of the most powerful chassis produced by Zenith. Employing e ght Jura -modules, it is designed for a nomirai high voltage of 29.6kv.

After removing one screw aid plying off thecontrol panel cover, an insula-ed scrEwdrivEris inserted through the :elite- toles of thecustomer controls to adjist the factcry pre-set controls.

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Approximately 74 percent of th3 chassis circuitry are containedthe eigh-. dura-moduies, with five if :Egra:ed circuits.

work of many larger components.One of the IC's (the chroma am-plifier/color demodulator) for ex-ample contains the equivalent of 43transistors, 53 resistors, 14 diodesand 3 capacitors. (See this month'sTekfax Schematic No. 1496.

In addition to the chroma am-plifier/color demodulator, the in-tegrated circuits include color sub-carrier regenerator, signal proces-sor/fringe-lock circuit, audio am-plifier and sound output and thesound IF, limiter, detector and pre-driver circuit.

The vertical chassis consists of avertical "wall" positioned on a nar-row horizontal steel base. Eightdura-modules are wall -mounted andsecured by plastic turnbuckles. Thisarrangement positions 74 percent ofthe chassis circuitry on modules sothat these circuits directly face theservice technician when the cabinetback cover is removed.

On the back of the chassis are theplug-in connectors for the tunerpackage plus the solid-state high -voltage tripler and divider packageand the sweep transformer. Thepower supply, including the protec-tive Power -Sentry system, is locatedon the horizontal base.

Removal of two screws and loos-ening of the side support hinge al-lows the vertical wall of the chassisto swing down for easy access to theback -of -the -wall components by theservice technician. This also allowsaccess to the tuner package. Theconvergence circuitry is placed

After minving two screws and loosening the side -support hinge, theon vertical wall o' the chassis swings down for easy access to the back

of the cha>sis.


around the neck of the picture tubefor fast, convenient adjustment.

Power -Sentry System

The Power -Sentry system, em-ploying magnetic voltage regula-tion rather than an electronic systemof regulation, replaces the conven-tional power transformer and com-plex electronic voltage regulationcircuitry found in many other solid-state color receivers. It converts un-regulated ac line voltages to a regu-lated ac voltage for use in the set,maintaining it at the specified operat-

ing level. It operates internally withinthe power transformer, which sup-plies all parts of the TV receiver,and thus all circuitry are protected.The system helps to protect the re-ceiver against transient surges or"voltage spikes" which are especial-ly damaging to solid-state compo-nents.

High -Voltage System

An integrated solid-state high -voltage tripler and focus divider areused in this chassis to take the out-put of the sweep transformer and

The voltage regLlating type transformer employed in the Power -Sentrysystem appears a little higher and larger than the conventional -typepower transformer.

Shown are the Jura -module connector pins and the plastic turnbucklesused to secure :he modules.

The Chroma Amplifier, Chroma Demodulatorand the Sub -Carrier Regenerator have been

combined into one module (9-86).

step it up to a design average of30kv, rectify it and provide theproper voltage regardless of appliedvoltage changes. The high -voltagetransformer and tripler are mountedbehind the vertical main chassis.

V.:deo IF Module

The Video IF amplifier stage ofthe 150-190 IF Subchassis moduleincludes an added video amplifiertransistor (the first Video Amplifierfor improved gain and better noisefactor performance). In the previousIF module (150-180), an emitter -

The convergence board is placed around the neck of the picture tube,allowing for a more compact chassis and simplifying convergence ofthe TV set.

The Video IF Module, 150-190, is shown with the shield removed. Also in-cluded is a Video IF transistor 2nd DETECTOR LEVEL control, previouslylocated on the Video Processor board.

The Sound -IF Amplifier and Sound -Output

stages are two IC units on one dura-module(9-103) shown to the left and the luminancedura-module (9.88) on the right in the picture.

The third Video Amplifier and the three (R

6 & B) Video Output transistors are combinedinto one dura-module (9-89).

NOVEMBER 1973, ELECTRONIC TECHNICIAN/DEALER I 27

follower stage was known as thefirst Video Amplifier. In this mod-ule, the emitter follower is calledthe Video Follower. The Video Fol-lower, the same as before, providesbetter impedance matching and im-proved coupling to the video stagesthat follow.

The DETECTOR LEVEL control,previously located on the VideoProcessor board, has been incor-porated into this IF module. The150-190 IF module has all com-ponent symbols printed on theboard for easy parts identification.

Chroma Module

The Chroma Amplifier, ChromaDemodulator and the Sub -CarrierRegenerator have been combinedinto one dura-module, 9-86. TheCOLOR -ALIGN (set-up) switch, theTINT RANGE (hue) adjustment coil,the ACC, APC, COLOR THRESHOLDand CROSS -TALK controls are all lo-cated on this board, not on thechassis. The basic circuit and align-ment procedures, however, remainthe same as in previous chassis.

Luminance ModuleThe Luminance dura-module

(9-88) includes the second VideoAmplifier, three blankers (horizon-tal, vertical and video) and thebrightness limiter transistors. The3.58MHz trap coil is located on thisboard.

Video -Output Module

Itte third Video Amplifier andthe three (R, G and B) Video -Out-put transistors are combined intoone dura-module, 9-89. The R, Gand B chroma gain taps are locatedon this board and are adjustablefrom high (H), medium (M), to low(L) by moving the red, green andblue color -coded leads from the "H,""M," "L" (printed on the board)connection pins as required forproper color alignment.

The Video Processor dura-mod-ule (9-87) contains the Sync andAGC circuits, the active element isthe Integrated Circuit unit, 221-45.The AGC delay control is locatedon this board.

Horizontal and Vertical ModuleThe horizontal dura-module,

990, contains all the transistors in

the horizontal circuit, except thehorizontal output which is mountedabove the board on the main partof the chassis on an adequate heat-sink bracket.

The vertical dura-module, 9-92,contains all of the vertical circuitsincluding the vertical -output transis-tors, mounted on special heat -sinks.The vertical circuit contains a dif-ferential amplifier, employing a pairof 121-972 transistors. This newmodule has been designed for directcoupling to the deflection yoke,eliminating the bulky vertical out-put transformer and the need for aVERTICAL LINEARITY control. Thevertical SIZE and CENTERING con-trols are located on the board, notthe chassis.

Sound Module

The Sound -IF Amplifier andSound -Output stage are two ICunits located on one dura-module(9-103). The integrated circuitunit, 221-48, is the 4.5MHz SoundIF Amplifier and Quadrature De-tector; the IC unit, 221-77, is theSound Preamplifier and Output.

module is designed for direct

The Horizontal dura-module (9-90) shown atthe left, contains all of the transistors in :hehorizontal circuit except for the output tran-sistor. The Video Processor module (9-87) isshown in right of the picture.

The Vertical dura-module (9-92) contains allof the vertical circuitry, including the vertical -

output transistor.

coupling to the speaker voice coil,thus eliminating the bulky soundtransformer.

The Chromacolor II, 19VDZP22,picture -tube employed in this chas-sis is the fourth generation of thecompany's Chromacolor family.Until the first Chromacolor picture-tube was introduced by the manu-facturer, a positive guard -band typewas used to safeguard the colorpurity in their pictures. With thenegative guard -band picture tube,the electron beam is larger than thephosphor dot. The beam illuminatesthe entire dot and some of the black-surround. Now, if the beam isslightly misaligned, it still lights theentire dot. The needed tolerance isstill provided; but the area betweenthe dots is greater and black mate-rial is present in this area to reducelight reflection and improve con-trast, permitting use of a non -tintedface plate and increased useful lightoutput on the picture tube bright-ness. The negative guard -band con-cept was made possible through thedevelopment of a new Iris mask.This mask, which fits over the in-side face of the tube and replacesthe earlier standard shadow mask,has 450,000 apertures (in the 25 -in.diagonal size). These apertures inthe original Chromacolor picturetubes were nine -thousandths of aninch in diameter. The mask is firstused much like a stencil during theapplication of the phosphor dots tothe inside face of the tube. The dotsof each color are applied and themask is then acid etched so that thecenter apertures are opened to 13.5thousandths of an inch. In the pres-ent generation of Chromacolortubes, the center apertures are 14.5thousandths of an inch and with thenew process they are nearly identi-cal in circularity.

The mask is then mounted about1/2 -in. behind the inside face of thetube. The beams coming from theelectron gun pass through the aper-tures to reach the phosphor dots andthe diameter of the beams strikingthe dots is larger than the dot itself.

Additionally, a jet-black light -ab-sorbing material surrounds each dot.This black -surround reduces roomlight reflections which cause colorwash -out and absorbs light splash



A Look at the 1974TV Sets Part II

by Joseph Zauhar

New modular chassis,

increased high voltage and cable -ready

chassis will highlight the new TV

sets for the coming year

Last month we reviewed the new features found inAdmiral, Channel Master, Electrohome, General Elec-tric and Magnavox color -TV sets for the coming year.In continuing our review we again find the manufactur-ers working towards a common goal of simplified cus-tomer controls employing one -button tuning systemsand in a few cases completely eliminating some of thecustomer controls. Increased high voltage and in -linepicture tubes will be employed for a sharper brighterpicture, making color picture tube replacements almostas easy as B/W.

Motorola's Model YA-15 remote control becomespractically immune to noises that cause false trigger-ing. Panasonic's new "Quatrecolor" chassis employsfive vertically mounted individual modular circuitboards with edge connectors. The new chassis employs40 transistors and six integrated circuits. A full two-year parts and labor warranty highlights Philco-Ford'smodular solid-state color -TV line in the 25 -in. (mea-sured diagonally) console models.

RCA introduces the most powerful XL -100 solid-state chassis, compared to their previous chassis. Itcombines with the Super Color black matrix picturetube a second anode voltage of 31kv at zero beam cur-rent. Introduced by Sylvania is a self-adjusting color -TV set that requires the viewer to only activate the setand select the channel. Zenith introduces a verticalsolid-state chassis with a self-regulating and protectivepower supply system.

MOTOROLA

Headlining Motorola's 1974 color -TV line entriesare the initial entries in the 12- and 17 -in. (measureddiagonally) screen size categories, a broader assortmentof 25 -in. (measured diagonally) "works in a drawer"console models and extension of wood look cabinetryto more models.

Motorola indicates that 14 of the 20 introductionsare 25 -in consoles and 11 feature 100 -percent solid-state chassis models. All models have plug-in modularchassis construction for ease of service, plus lnsta-Maticone -button color -TV tuning. There are no carry over

Panasonic's Model CT -911 theHeightside 19 -in. (measured diagr flatly) Quatrecolorportable color -TV set. Courtesy cl Panasonic.

models in the 25 -in. 100 -percent solid-state category.Eight of the introductions are remote controlled models.

Portable, table -model and console categories are in-cluded in the color -TV introductions comprising screensizes in the 12-, 17-, 19-, 21- and 25 -in. categories.The previous smallest Quasar portable was a 14 -in.(measured diagonally) model introduced one year ago.The 12 -in. portable Model WP333KW, as with all por-table and Quasar introductions, has solid-state com-ponents replacing all but four chassis tubes. Other fea-tures include Insta-Matic one -button color -TV tuningcontrol, wood -grain appearance cabinet and a detach-able color guard filter.

Continuing in the Quasar color -TV line are 17 models,including 9 portables and 8 table models and consolesof which 12 were introduced in the spring line.

PANASONIC

Panasonic has added four new sets to its color -TVline-one consolette and three portables, all with"Quatrecolor" features, which include 100 -percentsolid-state circuitry, modular chassis, one -button Q -locktuning and a Pana-Matrix black -background picturetube.

The Haskell, Model CT -256, is a 25 -in. (measureddiagonally) consolette. It offers such features as a Pana-lock AFT button, Panabrite dial, SHARPNESS control,VHF Set -and -Forget memory fine tuning, a UHF"Click -Stop" tuner, Speed -O -Vision for instant pictureand sound, a vacation switch, three IF stages and aCATV/master-antenna connector.

The Heightside, Model CT -911, is a 19 -in. (mea-sured diagonally) Quatrecolor portable color -TV set.It features Panalock AFT, VHF Dipole and UHF an-tennas, VHF Set -and -Forget memory fine tuning, aUHF "Click -Stop" tuner, Panabrite dial, precisionSHARPNESS control, Speed -O -Vision for instant pictureand sound, a vacation switch, CATV antenna con-nector and a personal earphone.

The Matson, Model CT -910, is a 19 -in. (measureddiagonally) Quatrecolor portable which features aPanalock AFT button, VHF Set -and -Forget memory


fine tuning, UHF "Click -Stop" Speed -O -Vision, a vaca-tion switch and a CATV/master-antenna connector.

The Covington, Model CT -912, is a 19 -in. (mea-sured diagonally) Remote Control Quatrecolor portableTV set. It offers the Panamatric Electro-Tuner, whichteams up with a wireless remote control hand unit TVoperation, Panalock AFT, Panabrite dial, VHF Set -and -Forget tuning, Speed -O -Vision, precision SHARP-NESS control, eight -position UHF detent tuner, vaca-tion switch, earphone and CATV/master-antenna con-nector.

The "Quatrecolor" chassis (covered in the TeklabReport, August 1973) is all solid-state with the excep-tion of the picture tube. A large majority of the com-ponents are mounted on five vertically mounted indi-vidual modular circuit boards with edge connectors.The chassis employs 40 transistors and 6 integratedcircuits.

Panasonic has added two new B/W portable sets toits TV line.

The Putman, Model AN -269A, is a 19 -in. (mea-sured diagonally) portable with matching stand and ina vinyl -clad metal cabinet. It features a remote speakerfor pillow listening, Speed -O -Vision, VHF Dipole andUHF antennas and three IF stages.

The Greendale, Model AN -182, is a 12 -in. B/Wportable which features a UHF "Click -Stop" tuner,Speed -O -Vision, a telescopic VHF antenna and a drop -down handle.

PHILCO-FORDA full two-year parts and labor warranty high-

lights Philco-Ford's modular solid-state color -TV linecovering 25 -in. (measured diagonally) console models.

In addition to the standard two-year warranty onconsoles, the company will offer an optional two-yearwarranty for new 19 -in. (measured diagonally) solid-state portable models.

The all solid-state modular chassis again employs 14"command modules," each about the size of a file cardand each bearing solid copper engraved circuits printedon a durable fiberglass board. Each module can be re-moved easily from the chassis, and since the moduleswork independently of each other, they can be replaced

An ultra -modern 25 -in.(measurer diagonally) color consoleTV, Model C2550ELK, is housed behind "slide -in" black plexiglassdoors and rests on a brushed chrome base. Courtesy of Philco-Ford.

with advanced models as new technologies are de-veloped. According to the manufacturer, before themodule is incorporated into the chassis, it is evaluatedfor acceptability by a massive automatic test and align-ment device that is tied into a computer which signalsfinal acceptance or rejection of each module. Also, the100 -percent modular color chassis undergoes a factory"burn -in," during which electric current flows throughthe chassis for up to eight consecutive hours.

Many of the 19- and 25 -in. (measured diagonally)all solid-state modular TV sets employ the Philcomatic"hands off" tuning system which features a network ofautomatic circuits to simplify the tuning process. Withthe Philcomatic Master Control button engaged, theviewer merely selects any VHF or UHF channel, andwhen the Philcomatic Color Control light comes ON heremoves his hand and the set is tuned instantly andautomatically.

Three deluxe Philcomatic III models feature an elec-tronic varactor pushbutton channel selector that can bepreset for any combination of 12 UHF or VHF chan-nels. A 70 -position detent rotary channel selector forUHF channels, which stops or "clicks" as each channelis reached, is standard on all other solid-state color -TVsets.

There are six all -transistor Boss chassis in the 1974"E" line and two hybrid chassis. All chassis are similarto those employed in the "B" line. The all -transistorizedcolor -TV sets employ the 4CS71, 4CS72, 4CS73,4CY87, 4CY90 and 4CY91 chassis. The 4CY80 and4CS40 are hybrid chassis.

The biggest difference in the new Boss chassis, ascompared to the "B" line, is that a new simplified con-vergence is utilized. Other changes in the new line in-clude a new deflection and signal mother boards. Thechanges in the former were required to accommodatethe convergence system. The convergence socket is nowa four -pin inline socket instead of an octal type. Someimprovements were also made in the copper of thesignal mother board.

Three new modules are used in the "E" line chassis.All three have new part numbers assigned, but only twocan be used as substitutes for their counterparts used inthe "B" line. These are the Sync AGC (Part No. 69-1023) and Low Level Video (Part No. 69-1022). Theother new module is the vertical module (Part No. 69-1021) and is not interchangeable because of the newconvergence circuitry.

The old Sync AGC Module (Part No. 69-1014)would work in the "E" line sets but it does not containthe improved circuitry. The old Low -Level VideoModule (Part No. 69-1011) will not work in the new"E" line because it lacks the plug for the new CONTRASTcontrol cable. The new Low Level Video Module (PartNo. 69-1022) incorporates a SCR modification. Theold Vertical Sweep Module (Part No. 69-10151) willnot substitute for the new version because of major cir-cuit changes required for the new convergence system.

The two "E" line hybrid chassis are similar to thelast year's chassis except for ACT and preset accom-modations.

Philco-Ford's new B/W -TV line is offering selections


ranging from 8 -in. to 22 -in. (measured diagonally)consoles. A new 9 -in. all solid-state TV set can beoperated by an attachable battery pack or on regularhouse current.

A 13 -in. set is offered with cabinets in white, tan-gerine, black and a finish to match walnut. Roundingout the line are nine models in 8-, 16-, 19-, 22 -in.diagonal categories.

RCA CORPORATION

RCA is introducing a new line of color -TV sets com-bining an RCA developed Super AccuColor black ma-trix picture tube and the most powerful XL -100 solid-state chassis yet to produce the brightest big -screen pic-ture in the company's history.

Super AccuColor black matrix picture tubes are usedin all new solid-state 19-, 21-, and 25 -in. (measureddiagonally) XL -100 color TV models and selected 19 -in. "XL -Color" models. The name "XL -Color" is anRCA designation for sets that are solid-state in manykey areas and establishes the design relationship between

A compact, solid-state electronics unit (left) is now incorporated intothe new ready -for -cable TV sets to replace the separate 24 -channelselector (right) previously required for cable TV systems. RCA's newline of 25 -in. (measured diagonally) color -TV features wireless remotecontrol, AFT, and instant picture-all features previously unavailablewith cable reception. Courtesy of RCA Corp.

them and 100 -percent solid-state RCA XL -100 re-ceivers.

First of the new chassis introduced in the "S" line isthe CTC58 chassis. This chassis evolved from the nowfamiliar CTC46, CTC48 series. All modules are direct-ly interchangeable but there are several new features.Changes have been made in the video peaking and con-trast, width adjustment and vertical output circuits.

Introduced are two additional all solid-state chassisto be used in console TV sets which display a 25 -in.(measured diagonally) screen. The CTC64 and CTC68chassis have basically the same chassis configurationand in many respects are similar to the recently intro-duced CTC58 chassis.

The modules are directly interchangeable with thoseemployed in other RCA S -line modular console chassis.The second anode and focus voltages are generated inthe same manner as in previous XL -100 chassis by asolid-state tripler driven by the horizontal -output trans-former. The second anode voltage is now 31kv at zerobeam current rather than 26.5kv as in previous chassis.To achieve the higher anode voltage, the horizontal -output transformer is designed with tighter couplingand more turns in the secondary winding to provide apulse of greater amplitude to the input of the tripler.Although functionally the same, internal componentsof the tripler have been changed, which prevents inter-changeability with versions used in other chassis. Theanode cup on the high -voltage lead is made consider-ably heavier because of the increased voltage.

The accompanying schematic illustrates the horizon-tal oscillator -disable or "hold-down" circuit used in theCTC64 and CTC68 chassis.

Several models using the CTC68 chassis are especial-ly designed for localities where there is extensive useof cable systems. These sets are equipped to receiveVHF and UHF broadcast signals, cable signals in theVHF -TV band, as well as cable signals in the "Mid"and "Super" bands.

Channel selections include the standard VHF chan-nels 2 through 13 by the KRK 211 VHF tuner. And12 positions, A through L, are available for off -the -air

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Simplified schematic of the high -voltage hold-down circuit employedin RCA's color -TV chassis CTC64168. Courtesy of RCA Corp.


UHF channels, which are processed by the varactor-tuned KRK 194B UHF tuner. A cable converter, KRK212, provides the means of processing up to 12 cablesignals.

The CTC66 is a hybrid chassis introduced for usein S -line portable and table model TV sets that displaya 19 -in. (measured diagonally) picture. The basicchassis layout is different; however, electrically theCTC66 is very similar to the CTC63 chassis used inS -line products.

The new CTC71 modular chassis is similar in mostrespects to the CTC60 chassis which it supersedes. It isemployed in color -TV sets with a 19 -in. (measureddiagonally) screen.

The signal processing parent board (PW300) em-ploys the same set of modules that are used in othercurrent XL -100 chassis.

The deflection circuits of the CTC71 and the CTC60are similar and the vertical system is basically the sameas that which is in the other XL -100 chassis. The hori-zontal -deflection and high -voltage systems are com-pletely different. Two additional diodes and a resistorhave been added to the base circuits of the vertical-output transistors to improve performance at crossover.Otherwise, the output circuit is similar to the ones usedin R -Line chassis.

A transistor output stage is used in the horizontalsystem instead of the familiar SCR deflection system.

The familiar CTC39 chassis is continued to be usedin S -Line products. The basic chassis configuration isvery similar to the R -Line version and is employed inseveral console TV sets with a 25 -in. (measured diago-nally) screen.

Portable color -TV sets with a 14 -in. diagonal screenuse the continued CTC51 chassis. Two versions areused, one features AccuTint.

Two versions of the CTC52 chassis appear in S -Lineportable color -TV sets which provide a 17 -in. diagonalscreen. One version, the CTC52XAH, is basically simi-lar to the R -Line chassis. The CTC52XAK is modifiedto use a bi-potential picture tube and includes the Accu-Matic IV feature.

The CTC53 and CTC63 remain in the current linewith no major revisions in the basic chassis. The Accu-Matic IV featured in S -Line TV sets provides one -but-ton control of the four picture qualities-COLOR, TINT,BRIGHTNESS and CONTRAST.

A new AccuLine color -picture tube is employed inportable TV receivers which use a precision in -line as-sembly and a screen consisting of continuous phosphorlines instead of dots to improve picture sharpness andbrightness. The deflection yoke and neck componentscan be pre -adjusted and arc permanently attached tothe picture tube by the manufacturer. This system al-lows the installation and set-up of a color -picture tubeto be essentially comparable to that of a B/W -tube insimplicity.

There are 14 chassis used in the 1974 B/W TV line,which offers a variety of personal portable, table andconsole models with screen sizes from 5- to 22 -in.(measured diagonally).

Two new chassis, KCS192 and KCS190, arc intro-

duced equipped with solid-state second Video IF stagesand-except for minor differences-are electricallysimilar to the previously introduced KCS189 chassis.

SYLVANIA

Highlighting Sylvania's new color -TV line for 1974is a self-adjusting color -TV set that requires the viewerto only activate the set and select a channel. All othermajor tuning functions are performed electronically byan advanced solid-state chassis. (See Teklab Report,September and October, "Sylvania's Modular E05Color -TV Chassis.")

The three chassis in the GT-Matic series are desig-nated E03, E04 and E05. The E03 is the basic chassisand is used in 21- and 25 -in. TV sets. The E05 is elec-

Sylvania's Model CL3421R color -TVset employing the varactor tuning system

and the GT-Matic chassis. Courtesy of GTE Sylvania.

Sylvania's GT-Matic chassis, designated [03, [04 and E05, employ plug-in circuit boards and plug-in transistors. The chassis automaticallycompensates for most signal deficiencies, electrical noise, and voltagefluctuations. Courtesy of GTE Sylvania.


trically identical to the E03 but is packaged to fit a 19 -in. (measured diagonally) cabinet. Similar to the E03,the E04 version also includes a varactor tuning systemand is available with remote control.

Two 19 -in. (measured diagonally) portables, three21 -in. and twenty-eight 25 -in. models have the GT-Matic tuning system.

There are three basic circuit boards-IF sound,Video/Chroma and deflection. The latter two are com-mon to all three chassis models. The E04 requires aslightly different IF board and it also has a fourth boardcontaining circuitry for the varactor tuning system.

Nine automatic control circuits compensate for mostvariations and deficiencies in station transmission, elec-trical interference and voltage fluctuations.

A "vertical countdown" integrated circuit, that is

equivalent in performance to about 120 conventionalsolid-state devices, eliminates the need for a VERTICALHOLD control and keeps the picture steady despite elec-trical "noise."

All three chassis arc CATV-ready-an industrystandard cable connector is included for easy hook-upto CATV or coaxial systems.

ZENITH

Zenith's 1974 color -TV sets will include 50 basicmodels and offer a total of five different screens in eithera 16-, 17-, 19-, 23-, or 25 -in. (measured diagonally)size. The 17 -in. screen size is new in the TV line.

Zenith's Chromacolor 11 system is a totally advancedsolid-state color -TV system which is new from chassisto picture tube. The Chromacolor picture tube is usedin four different screen sizes -17-, 19-, 23- and 25 -in.(measured diagonally). The chassis employed includesa 30kv horizontal chassis, Titan 300H; a 30kv verticalchassis, Titan 300V; a 27.5kv vertical chassis, Titan275V; and a self-regulating and protective Power -Sen-try system of magnetic voltage regulation.

The horizontal Titan 300H, vertical Titan 300V, andthe vertical Titan 275V are the most powerful chassis

Zenith's Model SE1750R, the Balboa, includes an innovative cabinetdesign and tilted picture screen and the Space Command 500X Ultra-sonic system of remote control. Courtesy of Zenith Radio Corp.

Zenith has ever produced for either of its big- or small -screen color -TV sets.

The Dura-modules employed in the chassis are spe-cial carrier panels that mount and interconnect solid-state devices such as transistors, diodes, integrated cir-cuits, resistors, capacitors, inductors, etc., in a desiredcircuit configuration. The dura-modules vary in sizefrom single ones that are 31/2 -in. by 23/4 -in. to the long-est that measure 43/4 -in. by 31/2 -in. Each is a plug-inunit that is removable for replacement and repair-if and when needed.

All of the solid-state chassis in the new color -TV linewill have five integrated circuits, one more than lastyear. The newcomer includes the audio amplifier andsound output stage. The integrated circuits include:The chroma amplifier/color demodulator; the colorsub -carrier regenerator; the signal processor; Fringe -Lock circuit; the audio amplifier and sound output; andthe sound IF, limiter, detector and the pre -driver.

An integrated solid-state high -voltage tripler andfocus divider are used in the vertical chassis to take theoutput of the sweep transformer and step it up to a de-sign average of 30kv or 27.5kv (depending upon chas-sis), rectify it and provide the proper picture focus re-gardless of voltage changes.

The horizontal Titan 300H chassis is employed in 27different 25 -in. (measured diagonally) consoles andcombinations, including 13 remote -controlled sets.

There are 12 new receivers (four 23 -in., five 19 -in.and three 17 -in. (measured diagonally) that employ thefirst vertical chassis ever developed by Zenith for color -TV sets. (See this month's Teklab Report and Tekfaxschematic No. 1496 for a detailed report on the 300Vchassis.)

Nine of these sets have the Titan 300V chassis andthe remaining three sets have the 17 -in. (measureddiagonally) screen size. The difference between theTitan 300V and the Titan 275V chassis is in the highvoltage.

Each of the vertical chassis consists of a vertical"wall" positioned on a narrow horizontal steel base.Eight dura-modules are wall -mounted and secured byplastic turnbuckles. This arrangement positions 74 per-cent of the chassis circuitry on dura-modules so thatthese circuits directly face the TV service technician whenhe removes the cabinet back of the color -TV set.

The power supply, including the protective Power -Sentry system, is located on the horizontal base. Zenith'sPower -Sentry system of magnetic voltage regulation isreportedly the first to be built into the power supply ofa color -TV set. The Power -Sentry is standard equip-ment in all 39 solid-state sets in the color -TV line.

By maintaining the voltage supplied to the TV set ator near its design level, there are a number of benefits.The picture performance is stabilized under low -voltageconditions. It also provides potentially longer life forthe picture tube and components by preventing over -voltage operation and providing isolation from voltagetransients or surges. It protects against "turn on" volt-age dips when electrical appliances start. The systemalso reportedly cuts down on the amount of electricity


NOVEMBER 1973, ELECTRONIC TECHNICIAN/ DEALER J 33

Use Utmost Carein Correcting those

Mistakesby Ernest W. Fair

The business wherein a mistake is never made in

handling customers at some stage of the relationship

simply does not exist. The shop owner who thirks

otherwise believes so only because the customers

who were victims of those mistakes never called

them to his attention-simply because thebusiness never saw them again.

Utmost care is a necessity forhandling every relationship with thecustomer all through the business.The simplest small error in a cus-tomer relationship must be avoidedif he is kept a loyal friend of thebusiness. Listed here are somepoints well worth keeping in mind.

Whenever any mistake was madein the business, be quick to admitthat it did happen. The customerknows for sure that the error wasmade and will seldom tolerate eva-sion of responsibility.

This is always one's first reactionwhen a mistake has been pointedout. It definitely pays to stop andbe certain that what the customer iscalling to one's attention was verydefinitely an error on the part ofsomeone on the staff of the shop.

The next step is to be sure thata full explanation as to what iswrong is received from each cus-tomer. If some small element isoverlooked in the process of correct-ing that mistake, the shop ownercan be sure his customer will blamehis business for certain.

Correction always means han-dling the situation totally and com-pletely if full loyalty of the custom-er is to be retained. Even thoughsomething exists which the individu-al forgot to bring up, he will still

blame the shop owner for it nothaving been handled, even thoughthe latter knew nothing about thisdetail.

Remedy any mistake called toyour attention quickly, even if itmeans that something else has to beset aside or overtime will be re-quired to handle the matter thatsame day.

It is easy to defer correction un-til tomorrow or next week, but alltoo often the whole thing is forgot-ten as new pressures and problemsarise. TODAY is the only day tocorrect any mistake made within thebusiness.

Double check every corrective ef-fort that is made during such a situa-tion and particularly with smallmatters such as in bookkeeping andbilling records where most errorsarise in the operation of a business.

If another mistake is com-pounded on top of the first one, thisis almost positive assurance that theparticular customer will never beseen again.

Accept blame for the error onbehalf of the business itself, eventhough you have but one personworking therein. This makes thewhole thing a much more imperson-al procedure. It is seldom advisableto single out a specific employee in-

sofar as the customer is concerned.When the shop owner does so, heducks his own responsibility in theeyes of his customer, who considerseverything involved as a very per-sonal thing between himself and theshop.

If the customer is definitely toblame in part for what has hap-pened, be sure to so inform him,BUT make the total correction any-way. This always gives it even great-er value in the customer's eyes as helooks back on what happened lateron.

Save correction of employees forthose mistakes where they are defi-nitely to blame until after contactwith the customer has been termi-nated.

Nothing is to be gained by mak-ing such a correction in view of acustomer. The individual who de-rives pleasure in the humiliation ofothers is seldom worth having as acustomer anyway.

It is also good procedure to haveevery correction that is made care-fully checked by the customer him-self and to secure his approval onwhat has been done. This helps re-duce the chance for further errorand also makes it clear to him thatyou are seeking to do everythingpossible to set things aright.

Apologize honestly to the cus-tomer for whatever inconveniencehe may have suffered because ofwhat happened when the mistakewas made. This is important wheth-er or not someone in the businesswas guilty of the error or it hap-pened to be one of those things thatjust occurred. It is something whichsits very well with every customer.

Treat the mistake occurrence assomething that rarely happens in thebusiness while you are talking withthe customer about it. If he thinksthat such things are routine, he mayvery well never come through thefront door again. Even if he does so,he will be eternally suspicious andconstantly looking for something toarise again.

Never forget the occurrence afterthe whole thing has been settledsatisfactorily with the customer.Keep records of every such incident.Study such records from time to



Take the timeRepair it rightCharge what it is worthby Bob Cook, CET

What kind of a reputation do you have as a shop or technician?

Butcher?

Sloppy Workmanship?

Recalls for Same Trouble?

Recalls for Trouble Not Reported in First Complaint?

Beautiful Work, Set Never Worked Better?

The first two character references(butcher and sloppy workmanship)are acquired in the mind of the nexttechnician that follows you into theset. The second two (recalls forsame trouble and recalls for troublenot reported in first complaint) areacquired in the minds of your cus-tomers as a result of the practices inthe first two. We have all heard cus-tomers say about some other shop:"1 had them out there three timesbefore they finally fixed my set. Iwon't ever call them again." Thelast reference (beautiful work) isearned by technicians that take thetime to do it right.

Let's explain some of the charac-teristics of the first two characterreferences and see how you stackup. Maybe you are costing yourselfmoney.

Butcher

Shotguns whole circuits replac-ing everything in the circuit insteadof taking the time to properly iso-late the defective component.

Uses high -wattage soldering gunon printed boards-loosening foiland burning sections so badly thatthe circuit must be reconstructedwith wire. Only low -wattage fine-tipped irons should be used on

printed circuitry; and if it is solidstate, one of the low -voltage typeirons should be used to avoid blow-ing a transistor through induction.

Bridging components. Bridgingone section of a three- or four -sec-tion electrolytic can with a papercapacitor may be quicker and easierthan replacing the can; but, if salt-ing has opened up one section ofthat filter, it is only a question oftime before it attacks another sec-tion and more trouble develops-possibly within your warranty time.Bridging any other component, i.e.,resistors, capacitors, diodes, etc.,leaves the possibility of the originalcomponent intermitting and caus-ing problems. Bridging an open re-sistor on the top of a printed boardinstead of pulling the chassis andreplacing the resistor in the samemanner as the original is certainlyfaster, but how much more reliableand neater your repair will be if youdo it right. When a resistor isbridged in this way, it is almost im-possible to avoid melting the solderon the bottom of the board and youare leaving a set with a cold solderjoint that has been known to causethermal intermitting.

Trimming component leads.Many sets come in with only the

ends of the new component's fullleads tack soldered to the connect-ing points. This leads your author tobelieve that some technicians havean aversion to cutting anything off.He has even had an RCA CTC16come in with four new powerdiodes, which were mounted in aspace about 2 -in. square, bridgedacross the original parts and tacksoldered to the ends of the full leads.They looked like miniature palmtrees and it doesn't take much imagi-nation to see how easily the powersupply could be shorted out.

Sloppy WorkmanshipRemoving and not replacing tun-

er and IF strip cover shields. Youcan be sure that manufacturerswould not spend the money to fabri-cate and install these shields if theywere not necessary for the properoperation of the TV set. Leavingthem off allows stray radiation toenter the front end of the receiver,degrading the picture. Also, in somesets leaving them off will seriouslydetune the alignment of the circuits.Your author has found several setsof the RCA and Admiral variety inwhich the previous technician hadremoved the IF cover panel to re -


NOVEMBER 1973, ELECTRONIC TECHNICIAN/ DEALERI 35

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Zooming inthat Station

by Joseph Zauhar

A built-in

solid-state amplifieremploying an integrated

circuit and a zoom control

permit adjustment of the

antenna to any reception

requirement

Solid-state technology today hasinfluenced practically every field ofelectronics. As an example, we nowhave new antenna designs that in-clude the very latest advancementsin electronics, combining solid-statecircuitry-to produce a compact,lightweight antenna with enoughgain for fringe operation at approxi-mately half the size of conventionalantennas.

A mast clamp is employed on each of thebooms for positive locking and positioned atthe center of gravity for stability.

The antenna amplifier board employs an in-tegrated circuit and a unique ZOOM controlwhich permits adjustment of the antenna toany reception requirements.

Kay-Towne's Model ICA-500of conventional antennas.

is designed for deep -fringe reception areas at half

I would object and know others infringe area localities who would al-so object to a large antenna, butwho would allow installation of asmaller antenna with equal gain.

The small size and design of theKay-Towne's Model 1CA-500 an-tenna received for evaluation isideal for most types of installations-whether it is placed in the attic oron the roof-yet it is not distracting

The antenna elements are mounted on squarebooms with heavy-duty cycolac insulato-s andan "Alchrome gold" finish for weather protec-lion.

the amplifier cover protects the amplifiercircuit and swings down for easy insta lationof the RG-59 coaxial cable and access "o theZOOM control adjustment.

from the natural roof lines. In manyapplications the antenna can be in-stalled without guy wires, using asturdy mount if the mast is 10 ft orunder in length. The smaller anten-na has low wind resistance, little me-chanical noise and less surface forthe icing conditions experienced inour northern climate. Another im-portant reason for thenician is that it requires less instal-lation time, thus possibly offering abetter profit.

We installed the antenna in afringe reception area locatedapproximately 45 miles west of Du-luth's VHF stations and approxi-mately 175 miles north of Minnea-polis, which we hoped to also re-ceive.

Design and ConstructionThe antenna is constructed of

heavy aluminum with an "Alchromegold" finish for weather protection.The dual square boom design em-ploys two mast clamps at the centerof gravity and heavy cycolac insu-lators to support the elements. Theantenna employs a number of fold-ed dipoles which are cut for half-wave operation, which is especiallyeffective in the low band of fre-quencies-compared to that of asimple dipole. A number of high -band passive elements are also usedwith a corner reflector acting as aUHF reflector and director for high-er gain on all TV frequencies.

Probably the most important partof the antenna design is the inte-


Despite the wooded area surrounding the antenna installation, we measured very high signalstrength from the antenna.

grated circuit amplifier located onthe antenna itself with a uniquezoom control (gain adjustment)which is adjustable for any recep-tion requirement. The output coaxi-al connector on the amplifier ac-cepts an RG-59 coaxial cable.

Antenna InstallationThe antenna was received pre -

assembled and all that was requiredwas the insertion of boom end plugsand swinging the elements out untila "click" was heard as they werelocked into position. The compactsize of the antenna permitted roof-top assembly and the taping of thecable to the mast before erectingand placing it into the existing rota-tor. We used the RG-59 all -channelcoaxial cable which was requiredby the manufacturer. A F-59 coaxi-al cable connector supplied with theantenna was placed on the end ofthe cable, then fed through a holein the amplifier cover and tightenedinto the amplifier connector. Aslight modification was made byplacing a rubber grommet in thecover hole, making a snug fit aroundthe cable. The coaxial down -leadwas taped to the existing 11/4 -in.galvanized pipe erected from theground level to the peak of thehouse, and a loop of excess cablewas formed around the rotator topermit full rotation.

Although the antenna is protect-ed with a dual diode, shunt coil cir-cuit and ac surge circuit, the outershielding of the cable was grounded

with a lightning arrestor as it enteredthe house for more protection.

The cable was then connected tothe ICA power supply input con-nector, which we mounted to therear cover of the TV set, but couldbe located next to any convenientac power receptacle. A short pieceof coaxial cable was assembled andconnected to the supplied XF-35matching transformer plus the UHF

Heavy-duty plates riveted to the square boomare typical of the rugged construction of theantenna.

FROMANTENNA

ICAPOWER

SUPPLY

The ICA power supply can be mounted to therear cover of the TV set or near any con-venient power outlet. The supp ied XF-35

matching transformer is connected to theVHF/ UHF antenna terminals of the TV set.

and VHF terminals of the TV set.

ZOOM Control Adjustment

The power supply was activatedand the antenna rotated to thestrongest signal.

In reception areas which are morethan approximately 50 miles fromthe VHF/UHF stations, no adjust-ment of the zoom control may benecessary. The ICA antenna wasshipped from the factory with thecontrol set at maximum gain.

In strong reception areas, adjustthe zoom control until interferencefree. Typical interferences are twopictures super imposed, bars rollingthrough picture, distorted pictures,etc.

This adjustment can be made bytemporarily mounting the antennaon the mast in an easy -to -reach posi-tion and taking a gain measurementwith a portable field strength meter,such as a Sencore Model PS134.

We left the zoom control at max-imum gain for our weak VHF sta-tions from a distance of 175 miles,since the nearest station was 45miles away and did not cause inter-ference or overload conditions onthe TV set.

continued on next page

The ICA Power Supply supplies the voltageneeded for the antenna amplifier through thecoaxial lead.

Sencore's Model P5134 Field Strength Meterwas used to measure the antenna gain whileadjusting the amplifier ZOOM control.

NOVEMBER 1973, ELECTRONIC TECHNICIAN/ DEALER 41

A close-upview of the ICA amplifier

board, showing the location ofthe integrated circuit, ZOOMcontrol and the locations of

the receptacles for thesingle channel traps.

We measured a maximum gainof 25dB on the strongest signal withthe zoom control set at maximumwhile at minimum gain we mea-sured 0 dB of signal.

Should the zoom control have noeffect on the distorted pictures andthe interference is caused by astrong local signal source-such asa single TV transmitter close by ora strong FM station signal-specialchannel traps are available from themanufacturer. In most cases thesource or sources of interferencewill be a channel or channels withintwo to five miles from the antenna.

ANTENNA PERFORMANCE

ChannelDB Gain

VideoDB Gain

AudioDistance(Miles)

3 25 22 45

4 -10/-13

-13 175

5 -10/-15

-15 175

6 25 18 45

8 16 11 45

10 20 13 45

Determine the source of i nterfer-ence and select the proper ICA-Ttrap which is available to be usedwith the antenna and install in thefollowing method:

Remove the buss bar found onthe amplifier circuit board mountedon the antenna. Positions 1 and 2are designed for two ICA-T VHFor FM channel traps and position 3is used for a ICA-T UHF channeltrap. If an FM signal is the source ofinterference, a ICA-T-FM trap maybe used in receptacle 1.

Multi -Set InstallationsThe ICA antenna can supply sig-

nals to more than one TV set byusing special coaxial set couplers.

COAXIALCABLECONNECTOR

VHFZOOM TRAP

CONTROL RECEPTACLE

INTEGRATED UHFCIRCUIT TRAP

RECEPTACLE

TVSET

i [1_

XF-35

TVSET

'

[ [

ICA XF-35POWERSUPPLY

A typical ICA antenna installation supplyingsigma] to two TV sets, employing the SCSC-2splitter and two matching transformers.

TVSET

XF-35

TVSET

XF-35

ICA

TVSET

XF-35

TVSET

IIICA

XF-35

POWERSUPPLY

A SCSC-4 four set splitter is used to supplysignal to four TV sets using one power supply.

If the ZOOM control has no effect on the in-

terference-such as caused by a strong localsignal source-single channel traps can be

installed in the amplifier board.

The Model SCSC-2 is employed fortwo -set operation and the SCSC-4is used to operate four TV setsfrom one antenna and ICA powersupply. One XF-35 matching trans-former is employed for each TV setused. The special SCSC-2 andSCSC-4 are not supplied but can bepurchased from your local parts dis-tributor or from the manufacturer.

Summary

We were quite pleased with theperformance of the antenna-pro-ducing good picture quality andhigh signal gain which was quiteflat across the VHF stations re-ceived.

Our aim was to receive the TwinCities stations Channels 4 and 5 adistance of 175 miles-and we suc-ceeded, although the picture was onthe snowy side. We felt the gainwas good considering the terrainand wooded area surrounding theantenna.

The preassembled antenna wasvery easily and quickly installed be-cause of its compact size and lightweight. The construction of the an-tenna should make it rugged enoughto withstand the most severeweather conditions.

Adjustment of the zoom controlcould be a little difficult if the an-tenna was installed more than 10 ftabove the base, but can be simpli-fied by mounting it temporarily andtaking a signal measurement.

The performance of the antennacan be contributed to new advance-ments in antenna designs employingsolid-state technology not availablein the past

MANUFACTURER S SPECIFICATIONS

Gain dB Front to Back Turning Boom Range Beam ShippingICA-500 VHF UHF VHF UHF Imp. Radius Length Width Weight

30 32 21 29 75 42 -in. 76 -in. 200 Mi. 28° 12 lb.


USE UTMOST CARE...continued from page 34

time to guide not only yourself buteveryone on the staff in proceduresfor the future. Doing so is the verybest way to reduce the number oftimes any steps will have to be takeliin mistake correction in the future.

Give the customer no opportuni-ty to demand that anything be doneabout the mistake when it is calledto your attention. Quickly seize theinitiative from the first moment youare aware of what he is talkingabout. Hold that initiative fromthere on out and those demandsfrom the customer will always beless than if you neglect to do so.

Check back on each correctionthat is made a day or so afterwardin order to make sure that every-thing was all right the second time.Customers do not always call a sec-ond mistake to the shop owner's at-tention, but just forget about thewhole thing and go elsewhere in thefuture. If everything is not satis-factory with the correction that hasbeen made, the odds are almost cer-tain that you have lost another cus-tomer.

Even when you have suspicionsthat the customer may havegood deal to do with the situation-though he admits nothing-it isstill best not to challenge him. Theshop owner has little to gain if hesucceeds with the challenge. Theunpleasantness which is sure toarise will be certain to produce alost customer regardless of howmany concessions have been givento him.

Remember always that this isprobably not a pleasant situation forthe customer any more than it is foryourself. Handle the whole thing ac-cordingly. Call on every capabilityfor consideration and good tastethat you have available for handlingsituations of this nature.

Do a little something extra for thecustomer if it is possible to do sowithout too great a cost while thecorrection itself is being made. Suchan action leaves him very much indebt to your business.

Give every customer a full recordof exactly what has been done inhandling the correction. All of thosesmall details will make it somethingof much greater importance to himthan if he knows nothing aboutthem.

The correction of mistakes offersa wonderful opportunity to buildlasting friendship for the business onthe part of every customer. Do italways with that thought first inmind.

TAKE THE TIME...continued from page 35

place a burned plate load resistor,probably destroyed by a shortedtube. You guessed it-the new re-sistor was tack solder bridged acrossthe original part with full leads.Then, probably to avoid shortingthe replacement to the cover, he leftit, along with the screws, at one sideof the cabinet. Sure, he had a pic-ture and ran in record time, but isthis the kind of work you wouldwant on your equipment? Needlessto say, if and when you come acrossthis kind of work, it behooves youto take the time and clean it up be-fore you call the job done. Eventhough you didn't do the work, thelast one in the set is usually the oneblamed for it.

Removing and not replacingmounting and grounding screws inchassis, tuner assemblies andgrounding straps. This can cause abasket full of problems all the wayfrom arcing and a hot faced CRTto blowing a string of IF transistorsin a solid-state set. Take the timeand put them all back where theycame from.

Too much or too little solderalong with cold -solder joints, es-pecially on printed -circuit boards,can cause thermal intermittentopens and shorts that can consumehours of wasted time later. Takethe time to do it right!

ConclusionA proper repair should require

an expert to determine where the re-pair was made. The defective com-ponents should be located with mod-ern trouble -shooting techniques andonly the defective parts removedand replaced with an exact replace-ment part in the same manner as theoriginal. Your author realizes thatmany of these sloppy -work syn-dromes are caused by hard-pressedtechnicians trying to put out morework than can be properly done inthe time allowed. Hence the title ofthis article. It is really more profit-able-for you the technician andyou the boss-to insist that repairs

are properly made. You will notonly gain a reputation for excellentwork, but you will make more mon-ey by eliminating the cause of manyexpensive recalls. In the process,you will have to raise your flat rates,if you use flat rate schedules, butremember that in the customer'smind "the bitterness of poor qualityremains long after the sweetness ofa low price is forgotten."

TEKLAB REPORT .. -

continued from page 28from adjacent phosphor dots.

The development of the maskalong with the jet black -surroundthat soaks up reflected ambientroom lighting made it no longernecessary for the manufacturer touse the low -transmission glass in theface of the picture tube.

SummaryThe vertical chassis will enable

the service technician to quickly re-move any of the eight dura-moduleswith just a half turn of the plasticturnbuckle. By removing two screwsand loosening the side supporthinge, it allows the vertical wall ofthe chassis to swing down for easyaccess -of -the -wall com-ponents. If the chassis requires shopservice, just unplug the tuner andspeaker leads, remove six screwsand the picture tube and all slideout together as one single unit.

The new "E" line chassis are de-signed for a nominal high -voltageand many picture tubes now in stockand supplied for use in earliermodels are not rated high enoughfor use with these higher voltagechassis and may not be used.

We were pleased with the opera-tion of the Power -Sentry power sup-ply and we were able to drop theline voltage down to 68v before wenoted margins on the screen of theTV set. The TV set produced agood, bright, picture with plenty ofcontrast and sharpness even underthe bright lights of our laboratory.

MOVING?Be sure to let us know your new address.Please enclose a complete address label

from one of your recent issues.


TEST INSTRUMENT REPORT

Triplett's Model 8035Digital VOIVI by Phillip Dahlen

Includes automatic polarity selection and

over -range blanking circuitry

Although digital multimetershave been on the market for severalyears now, too few electronic tech-nicians are well enough acquaintedwith these new instruments to putthem to proper use-a must for theeffective servicing of newer solid-state circuitry. Thus, although thisinstrument does have many note-worthy characteristics, also of im-portance is the detailed instructionmanual supplied with the instru-ment. The 44 -page manual not onlyincludes a complete schematic butspecifications, a safety notice, de-tailed operating instructions for allscales and functions, complete the-ory of operation, plus calibrationand maintenance information.

A sample was sent to our elec-tronics lab for evaluation and wefound the large, clear, green, digitalnumerals to be quite bright and easyon the eyes. It is designed to pro-vide just about every ac or dc volt-age or current measurement re-quired for tube or solid-state circuittesting, plus all necessary resistanceranges.

Manufacturer specifications forthis useful bench instrument includethe following:

DC VOLTAGERanges:

0 to .1, 1.0, 10, 100 and 1000vdcAccuracy: (23°C ±1°C or 73°F

±2°F)±.1% RDG ±1 digit

Temperature Coefficient:±.01% RDG/ °C -1-.01% F.S./ °C

Input Resistance:10M ± 1% on all ranges

Normal Mode Rejection:Greater than 30dB at 60Hz

Common Mode Rejection:Greater than 80dB

Overrange:100% (1999 counts) on all except

the 1000v range, which is 10%Full -Scale Step Response:

2 sec (3 sec on the lv range)Overload Protection:

1100vdc on all except the 100mvrange

125v ac or dc on the 100mv rangeAC VOLTAGEType of Response:

Average sensing, RMS calibratedRanges:

0 to .1, 1.0, 10, 100 and 1000vdcAccuracy: (23°C ± 1°C or 73°F

±2°F)±.5% RDG ±1 digit

Range Frequency100mv 40Hz to 20kHz1.0v 40Hz to 20kHzI Ov 40Hz to 20kHz100v 40Hz to 10kHz1000v 40Hz to IkHz

Temperature Coefficient:±.05% RDG/ °C ±.02% F.S./°C

Input Impedance:10M ± 1% shunted by less than

50pfOverrange:

100% (1999 counts) on all exceptthe 1000v range

No overrange on the 1000v rangeFull -Scale Step Response:

4 secOverload Protection:

1100v ac or dc on all except the100mv range

250v ac on the 100mv rangeRESISTANCERanges:

10052, IK, 10K, 100K, 1M and 10MAccuracy: (23°C ±1°C or 73°F

± 2°F)±.25% RDG ± 1 digit on all ex-

cept the 1M and IOM ranges.±.5% RDG ±1 digit on the 1M

range± 2.0% RDG ± 1 digit to 10M on

the 10M rangeTemperature Coefficient:

±.05% RDG/°C ±.01% F.S./°Con all except the IOM range

±.1% RDG/ °C ±.01% F.S./ °Con the 10M range

Overrange:

Triplett's Model 8035 Digital VOM. For moredetails circle 900 on the Reader Service Card.

100% (1999 counts) on all rangesexcept the IOM range, whichhas none

Full -Scale Step Response:2 sec on all except the 10M range15 sec for the 10M range

Voltage Across Resistor Under Test:100mv at F.S.

Test Current:10052 Range: I ma 100K Range: Ilia1K Range: 100pa 1M Range: 100na10K Range: 10pa IOM Range: lOna

Overload Protection:+1000v dc or -125v dc on all ex-

cept the 10M range±400v dc or 250v ac on the IOM

rangeCURRENT, AC & DC

1000a, lma, 10ma, 100ma and1000ma

Accuracy: (23°C ± 1°C or 73°F±2°F)

DC: ±.2% RDG ± 1 digit for allexcept the 1000ma range

± .4% RDG ± 1 digit on the1000ma range

AC: ±.7% RDG ±1 digit, 40Hzto 20kHz, for all except the1000ma range

±1.0% RDG ± 1 digit, 40Hzto 20kHz, on the 1000marange

Temperature Coefficient:DC: -1-.01% RDG/ °C ±.01%

F.S./ °CAC: ±.05% RDG/°C ±.02%

F.S./ °COverrange:

100% (1999 counts)Full -Scale Step Response:

DC: 2 secAC: 3 sec

Voltage Drop Across Input:100mv dc and RMS ac at full-scale

readingOverload Protection:

2a fused on 1000ma, 100ma and10ma ranges

100 times overload on the 1 marange

300 times overload on the 100parange


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.. for more details circle 131 on Reader Service CardNOVEMBER 1973, ELECTRONIC TECHNICIAN/DEALER 45

COLORFAX

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

ADMIRALColor -TV Chassis M20-Filament Fuse

There have been several reports of intermittent opera-tion of the receiving -tube filament fuse in early M20 chas-sis. The problem usually occurs at the Molex connector.J900.

EARLY PRODUCTIONCIRCUITRY

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LATE PRODUCTIONCIRCUITRY

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mow' smcow,

P900r

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11014 /MI.

011111MOIS11C111 rift

f frit

101 tintr I Mil/ax

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f1142.111uln

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TOP VIEW OF CHASSIS SHOWINGLOCATION OF TERMINAL STRIP.

275v;a CIO'

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260d

51i02 s0(.11Ow

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1'9020901

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r90.4Zi

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1900

After the beginning of production, the fuse for the 6.3vac receiving -tube filament circuit was moved from thePower Supply Module (M900) to a terminal strip on thechassis. This fuse on the module is symbol F903; on thechassis it became symbol F101.

All M900 Power Supply Modules contain the F903 fuse;on later production chassis, it is simply wired out of the cir-cuit by a change in connector wiring.

You can change early chassis by adding a terminal stripand fuse and by transferring the filament circuit leads fromthe Molex connectors to the terminal strip. The componentsrequired for this change, plus instructions, are available aspart number 98A136-6.

EMERSONColor -TV Chassis M20-Excessive Brightness, Washed Out Video andNo BRIGHTNESS Control

There have been reports of an unusual condition in theM20 chassis which can result from failure of a fuse in thelow -voltage power supply module. You would not expectan open fuse to cause this condition, but it does.

The problem can be caused by open fuse F904 whichhas a 1/2a pigtail, Part No. 84A7-16 on the power -supplymodule. The F904 fuse is in the secondary of the power

ro

few

INI

M900 POWER SUPPLY

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transformer, supplying ac to the 400v B+ circuit. Becauseof the power supply design, 285v still remains on the 400vB+ line when the fuse opens. The reduction of B+ voltageto the cathodes of the picture tube will result in excessivebrightness and no control of brightness.

Check the circuits supplied by the 400v B+ and asso-ciated components. When repairs have been made, replacethe open fuse.

Color -TV Chassis M-20-Sound Okay, No Picture, Set Smokes

Examination of the M400 chroma processor moduleand/or M700 video chroma output shows burnt ordamaged components. When either or both modules are re-placed, the same components in the replacement moduleare immediately damaged.

Normally module problems are contained in the specificmodule showing a problem. However, in this instance, thefault is due to a defective component in an associatedmodule. Capacitor C310 in the M300 signal processormodule is shorted causing a much higher than normal hori-zontal pulse to be applied to the M400 chroma processorand the M700 video output module.

Repair the M300 signal processor, the M400 chromaprocessor, and the M700 video chroma output module asshown in the chain reaction information.

Module M300

When capacitor C3I0 shorts, a much higher than nor-mal pulse is applied to capacitor C311, causing this ca-pacitor to split open.

Replace capacitor C3I0 and open capacitor C311.

Module M700

When capacitor C310 shorts, a much higher than nor-mal horizontal pulse is also fed to resistor R716, causingit to burn to an almost open condition and blanker tran-sistor Q700 to split apart.

Replace burnt resistor R716 and damaged transistorQ700.


Module M400

When capacitor 0310 shorts, a much higher than nor -

ID

M300PI I

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COLORFAX...continued from page 47

mal horizontal pulse is fed also to module M400, causingresistor R439 to burn, capacitor 0442 to short, and tran-sistor Q402 to turn ON very hard and conduct heavily, re-sulting in damage to resistor R447.

Replace burnt resistor R439, shorted capacitor 0442 anddamaged resistor R447.

MOTOROLA

Color -TV Chassis Early 16 and 18TS-929-Fuse Failing for NoApparent Reason

It is assumed that the horizontal driver, output anddamper tubes are good and that the horizontal -output tubegrid bias has been checked and is near normal.

If the horizontal output cathode fuse is the clip -in type,use a special red -banded .5a fuse (Fuse Part No. 65-138460). If fuse is a soldered -in type, install a special kit(Part No. 65P65192A91).

It is suggested that the following checks be made in thefollowing order:

Beam current may be set too high. Allow five minutewarm up time, then measure the boost voltage with noraster (zero beam current, using the 1000v dc scale on themeter). In manual operation and with the BRIGHTNESS con-trol at maximum, adjust the MASTER BRIGHTNESS controlfor a 50v drop in the meter reading.

Check pincushion transformer T-500 for overheating or

for discolored insulation. Replace any defective transform-ers with a new type: TS -929B45 and earlier, use25D70067A01; TS -929B46 and later, use 25P65192A67.

If the above steps do not solve the problem, install a newtype horizontal output transformer (Part No.24P65174A43). It also includes a .6a fuse which shouldbe installed. (Do not use the .6a fuse used with the old -typetransformer.)

If the problem causes the horizontal -output tube plateto turn red and trips the circuit breaker (blows cathodefuse on early TS -929), check the following componentsand voltages:

Check for grid drive bias on the horizontal -output tube.If present, inspect pincushion transformer T-500. If insula-tion is discolored, remove leads 4 and 6 to the primary ofT-500. If overheating is corrected, change the transformer.

"Sure, I'll fixa wall!"

it for half price-hut, the results will drive you up

Rugged -inside and outThe new RCA WR-538A Super Chro-Bar is rugged insidebecause it has a high -quality glass epoxy PCB and the latestdigital -IC circuits. Outside, its abuse -resistant die-castaluminum case provides the kind of rugged protection youneed for hard day-to-day field use.Added features: 75 ohm/300 ohm output for MATV/CATV/CCT V An RCA exclusive, "Superpulse" signal for trouble-, hooting, tracking tests An RCA exclusive, "Superpulse Sync" control for weaksignal test An RCA exclusive, color bar markers for positive baridentification Wide operating temperature range - 5° F to 145° F All this - plus one-year parts and labor warranty - foronly $129.95*To buy: order from any one of the more than 1,000 Auth-orized RCA Distributors worldwide. For more informa-tion on RCA's full line of color bar generators, write RCAElectronic Instruments Headquarters, Harrison, N .J.07029.

RCA ElectronicInstruments

*Optional Price

. for more details circle 125 on Reader Servica Card


TECHNICAL DIGEST

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

ADMIRALTV Chassis H3/H4/K2/K3/K4-Weaving or Pulling in the Picture

Weaving or pulling in the picture can possibly be causedby heater -to -cathode leakage in the horizontal oscillatortube, 8LT8. This condition will appear as if the electrolyticcapacitor in the low voltage power supply is defective. Con-firm this possibility by substituting another horizontal -oscillator tube.

Servicing Solid -State TV Receivers

Most electronic technicians are pretty well aware by nowof the special precautions that must be taken when servic-ing solid-state devices, but it is so easy to forget and takecertain shortcuts that were considered perfectly acceptablebefore the advent of solid-state that we feel a reminder isin order.

Take, for instance, the formerly accepted practice of us-ing a screwdriver to draw an arc to test for the presence ofelectrical potential, or to bleed off the charge from a pic-ture tube or electrolytic capacitor. This practice is absolute-

ly forbidden in solid-state servicing. It will almost invari-ably damage solid-state components, even if there is no im-mediately apparent damage, the life of one or more com-ponents may have been seriously shortened, thus resultingin subsequent failures.

Troubleshooting in solid-state TV chassis consists pri-marily of voltage and resistance measurements. Such pro-cedures, using the appropriate instruments, should disclosemost defects in any circuit.

RCA CORP.TV Chassis KCS192-Horizontal Retrace Blanking and Second Video

IF Circuits

A new hybrid chassis, KCS192, is introduced this yearin a 16 -in. (measured diagonally) B/W portable TV re-ceiver, Model AS164. This chassis is electrically similar tohybrid chassis KCS189, which was introduced last fall inthe 9 -in. (measured diagonally) models; and all -tube -typechassis KCS188, which was introduced previously in 12 -in.(measured diagonally) models.

Like the KCS189, the KCS192 chassis is equipped witha solid-state second Video IF circuit, shown in the illustra-tion. However, in the KCS192 chassis double -tuned inter -stage coupling (T206, C222 and T207) is used betweenthe tube -equipped first Video IF instead of the untunedtransformer coupling used in the KCS189. Ferrite beadsFB201, FB203 and FB205 are included in the design toeliminate the possibility of "beat" interference on Channel8.

Another significant difference between the KCS192 andcontinued on page 50

TEST RIG FOR TUBE & SOLID STATE-"'THE COMBO RIGMODEL CJ -175

1E1995less picture tube ELIMINATES HAULING CABINET

& TUBE SPEEDS TROUBLE SHOOTING SERVICES TUBE & SOLID STATE

TELEMATIC TEST RIG CJ -175CONSISTS OF:

Compact metal case Universal Yoke Convergence Yoke Blue Lateral Magnet Solid State Transverter 4' Anode Extension 4' 90 degree CRT

Extension 4' Yoke Extension Convergence Load 4 Yoke adaptors for

Solid State

us for free subscription of cu -rent cross-reference charts.

/e atk Write2245 Pitkin Avenue, Brooklyn, N.Y. 11207


NOVEMBER 1973, ELECTRONIC TECHNICIAN/ DEALER 49

TECHNICAL DIGEST...continued from page 49

the KCS189 is the addition of horizontal retrace blankingshown in the illustration. Diode CR102-connected acrossthe winding of the horizontal -output transformer fromwhich is developed the horizontal retrace blanking pulse-clamps the blanking pulse to a level below that at which

140V

12011.8mH

R2158200

C2431000 R216

10K

C225R212 t 100056

1 - C22.70226 I 3904 7 -

02012ND PIXIF

C2248.2

1207--_La

L202

R21933

R221 R22910K 1800

T208(0001

I

plied to the screen grid on the picture tube through theretrace blanking winding and resistors R107 and 8108.Diode CR102 remains reverse biased until the voltage onits anode exceeds 87v.

During the retrace interval, the high positive pulse de-veloped across the primary of the horizontal -output trans-former induces a negative -going pulse across the retraceblanking winding. Because this establishes a negative po-tential on pin 6 of the winding relative to pin 1, diodeCR102 remains reverse biased and the negative -going pulse

TOSOUNDF

C241 L204

10 FB 201 36,H

18 202 C239VIDEO 3DETECTORCR 201

4-4 C236416 201 27

ringing normally would occur. The approximate 87v de-veloped at the junction of resistors R236 and R253 is ap-

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"opposes" the 87v from the junction of resistors R236 andR253, decreasing the voltage on the screen grid of the

picture tube to about 30v, which, in turn, cuts OFF thepicture tube.

When the negative -going pulse induced across the blank-ing winding ceases, the reactive components of the blank-ing circuit would normally cause it to "ring," producing atrain of damped sine waves. However, because the ampli-tude of the ringing exceeds the 87v on the cathode ofdiode CR102, the diode conducts and damps it out, clamp-ing the voltage on the screen grid of the picture tube toabout 87v during the trace interval.

SYLVANIA

Do It Yourself Sub Tuner Tester

We feel the following Sub Tuner Tester should prove tobe a very useful instrument and could save you somemoney by building it yourself from spare parts.

The Sub Tuner Tester can be constructed in about 20minutes. The basic cost is merely that for one VHF tunerand a 9v battery. The rest of the parts are likely to be


50 I ELECTRONIC TECHNICIAN/ DEALER, NOVEMBER 1973

found in your junk box.A point of interest is that the battery holder is made out

of a tube shield. Take the shield and shape it to the bat-tery as shown in the illustration and solder it to the tunershield.

The ON/OFF switch is eliminated by removing the bat-tery clip when not in use, saving the cost of a switch. The

ANY KNOBS WITHCHANNEL &FINE TUNING

100K OHM, 1/2 WATT ANT. TERMINAL BD

IFOUTPUT

COAX

RCA JACK FEMALE

.12B. It UHF

INPUT

L2k.

AGCJ.D

SOLDERED

TUBESHIELD

life of the battery is estimated at better than 15 hr. Thetotal amount of battery drain is approximately 10ma withor without signal.Basic Parts Needed :

One each: VHF tuner, No. 54-17907-3; resistor, 100K.1/2w; capacitor, .1p,f, 50v; battery, No. 9VEV216 orequivalent.Accessories From Junk Box:

One each: channel indicator knob; fine tuning knob; an-tenna terminal board; tube shield-spin type; battery clip-taken from discarded 9v battery; coax cable-smallflexible type with an RCA female jack.

1974 TV SETScontinued from page 33

needed to operate color -TV sets.Zenith's new electronic tuning system is incorporated

in 15 receivers covering the 17-, 19-, and 25 -in. (mea-sured diagonally) screen sizes. It makes possible "cus-tom programming" of as many as 14 VHF and UHFchannels operating in the area in any sequence desired.Consumer controls at the set in all models with elec-tronic tuning are concealed under a vertical accesspanel at the side of the picture tube.

In remote control tuning, the new Zenith line offerstwo new systems-the Space Command 600Z for 25 -in.and 19 -in. diagonal solid-state sets, and the Space Com-mand 500X in a 17 -in. diagonal table model. The re-mote system is offered in 19 different sets in the 1974color -TV line.

Chromatic tuning is offered in 47 receivers with afront -of -the -set control button. Pressing the button se-lects Automatic Tint Guard and factory preset pre-cision adjustments of BRIGHTNESS, CONTRAST, COLORLEVEL and TINT controls.

Zenith features revolutionary styling for the B/W -TV line for 1974. New colors, shapes and materialshave been used to give them a bright, contemporarylook.

A 12 -in. (measured diagonally) TV set on a swivel -and -tilt base which can be swiveled 360° or tilted 10°up or down, is also offered.

Larger portable B/W receivers have been redesigned.Some new 19 -in. diagonal portables combine an "A-line" design and a cantilevered base for a distinctivelook.

"You had put the hack on epside down, and left your FIX IT YOURSELFBOOK inside!"

NOVEMBER 1973, ELECTRONIC TECHNICIAN/ DEALER I 51

DIAL& CODERDelta's Instant

EmergencyTelephone

warning System.

Dial & Coder guards you around -the -clock, signaling alarmgency condition where a simple contactclosure activates the system. Completelysolid state, Dial & Coder utilizes thelatest in discrete and integrated circuittechnology to provide immediate remotesignaling between any two telephones.

CHECK THESE FEATURES!Dial any phone number up to eightdigits.

Change numbers in ten seconds. Over 100 different code combinations

allow multi -phone connections. Works with any direct contact switch. Unlimited applications. Use with in-

trusion detectors, fire & smoke detec-tors or a simple button control. Allowschildren, clerks, or physically handi-capped to call for help.

Automatic redialer when busy signalreceived.

Microphone can be added for audiosurveillance.

Self-contained power supply. Oncetripped, unit cannot be stopped.

This one's really priced right!

Made in U.S.A.Write or Call today for free sales details!

A DATA PRODUCTS, INC.P.O. Box 1147, Grand Junction. Cob. 81501,

Dept. ETD, (303) 242-9000

Superior Products At Sensible Prices. . . for more details circle 108 on Reader Service Card

NEW PRODUCTS

For additional information on productsdescribed in this section, circle thenumbers on Reader Service Card.Requests will be handled promptly.

SOUND LEVEL METER 703

Measures and monitorsnoise environments

A new, hand -size, easy -to -read -and -operate Sound Level Meter (SLM) isdesigned to economically determinesound pressure lev-els and to help pin-point "noise pollu-tion" sources suchas found in indus-trial and audio sys-tems in concerthalls, etc. The port-able, Type 3 SLM,Model 370, is a

general purposesurvey sound pres-sure level meterthat meets or ex-ceeds ANSI specifi-cations, SI. 4-1971,for Type 3 soundlevel meters. The simple to operateunit has an operational range of from40dB to 140dB in nine steps, an omni-directional lead-zirconate-titanate ce-ramic microphone and selectable A, Band C weighted response. It is pow-ered by two 9v transistor radio bat-teries with an estimated service life ofapproximately 40 hr. The output forthe meter will reportedly not overloadfor input levels of up to 8dB abovemaximum scale reading for frequen-cies from 63Hz to 8000Hz on anyrange. The unit features a meter sus-pension movement with 1.5 in. diallength, and a flat black aluminum casewith high impact plastic cone measur-ing 71/4 in. long by 2 in. deep by 3 in.wide. Triplett Corp.

5

I .0-,rre

MATV TAP -OFF 704

Available with fourdifferent isolation values

A new low -loss extended -range tap -off for Master Antenna TV(MATV)systems is based on the company'sULTRA -TAP design. Features of .thenew units reportedly include: lowerinsertion loss; extended passband toinclude sub -channels VHF, FM andUHF; adaptability for extra services.Designated Model UT -82 (single out-put), the tap -off is available with fourdifferent isolation values. Models B,Y, R, W ranging from 12dB to 30dB

with insertion loss between 1.2dB and0.5dB maximum at UHF. Equippedwith gamma "G" receptacles, the unitwill accept 75fl and 30011 push -onplugs. Simplecrimp -on patenteduniversal bushingsand a positive -gripping clutch re-portedly make fast,solderless connec-tions to the feeder.The unit can heflush mounted instandard 2 in. by4 in. electrical box-es. Jerrold Elec-tronics Corp.

i111111111111111111111111111111111emi

PICTURE TUBE TESTER 705

Three -color scale andline adjustment for accuracy

A Model KP710 Picture Tube Test-er is designed for portable, "on thejob" use as well as on the bench. Eco-nomic pricing makes it "affordable" to

take on every call. The picture tubechecker (Telematic Pix Mate) checkseach gun for emission, leakage andshorts, with a legible three -color scaleand line adjustment for accuracy. Itreportedly checks all 90° tubes. Anadapter is available for 70° picturetubes. TeleMatic.

ANTENNA 706

Higher UHF gainand electrical isolation

A new series of VHF/ UHF Cross-fire antennas incorporating new -typecolinear elements and a specially de-signed corner reflector are designedto provide better performance on theUHF band, particularly the lowerchannels which carry most of theUHF programming. The antenna, ineight models, is called the "Ultra -HiCrossfire" and is designed for all typesof reception areas. The UHF sectionhas been specially engineered to avoid


interference with the rest of the an-tenna. The antennas replace the pre-vious VHF/ UHF ('rossfires model formodel. Previous tubular constructionof the colinear elements has been re-placed by stronger metal stampings,

which also fold more compactly andfit into smaller cartons. The antennahas a single set of terminals and in-cludes a hand splitter which employsseparate VHF and UHF circuits, af-fording complete electrical isolationbetween outputs. Channel Master.

SOLDER VACUUM 707

Includes safety feature toprevent eye injury

A self-contained vacuum tool forfast, efficient desoldering of compo-nents on PC hoards or terminal stripsis designed. In operation, the solder

is first melted, thenthe suction tip is

placed in contactwith the moltenpuddle and thetrigger button ispressed. Because ofa high onset ofvacuum, the solderis sucked up andthe tool then cleansitself automaticallywhen it is reload-ed. The tool called"Mini," has a

20mm by 2mmTeflon tip which isideal in restrictedspaces. It measures81/2 -in. long and

features a design to prevent eye in-jury. Conseil.

AUDIO DISTRIBUTIONAMPLIFIER 708

Provides six completelyisolated balanced outputs

A Model DA -6 distribution ampli-fier is designed to bridge or match a60011 audio line, balanced or unbal-anced, and provide six completely


INVESTSMINWISREADING.(ADD $150 OR MORE TOIDUR

EARNINGS PER WEEK.)Chemtronics chemicals can do that for

Starting with Tun -O -Wash. Ourexclusive premium degreasercan help make a lot of jobsfaster, better and less expensive.

Got a really dirty tuner?Tun -O -Wash degunks it like anultrasonic bath-removing dirt,oxide and caked -on lubricant.Without drift. Without harmingplastics. Without causingintermittents. And no need topay another guy to do the job.

But Tun -O -Wash's powerfulspray is good for lots of otherthings. Like cleaning tube pinsand sockets, to restore properoperation. Degreasing of thoseencrusted switches youfind on hi-fi compo-nents and appliances.For removing greasefrom practically any-thing, the premiumelectronic solvent inTun -O -Wash just can't be beat.Cleans tape heads, motor drives,brushes, linkages, cams and gears.Has dozens of other applications.

When you're finished cleaning,you can re -lubricate just as easily,with Chemtronics premium cleaner

lubricants. Like Tun -O -Foam,Tun-O-Brite, Tun-O-Lube orColor Lube.

Why not get the full storyon Chemtronics time -saving,money -making chemicalproblem -solvers. See them at

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The rightcontrol forover 1,000

applications

)

The right control for exactreplacement is most often aCentralab miniature wire -wound control. They're thetime and temper savers forall your trouble shooting.

Centralab wirewoundsare available in both 11/2

and 3 watt ratings in fourmounting styles: flange, PC.tab and bushing mount. Re-sistance values range from1.5 ohm to 15K ohms. And.for added convenience,nylon plug-in shafts andtandem twin couplers areavailable. Ask for Centralabwirewound controls fromyour Centralab stockingdistributor.

DISTRIBUTOR PRODUCTS

vOiCENTRALABElectronics DovisionGLOBE -UNION INC

5757 NORTH GREEN BAY AVENUEMILWAUKEE, WISCONSIN 53201

. for more details circle 105 on Reader Service Card

54 ELECTRONIC TECHNICIAN, DEALER, NOVEMBER 1973

NEW PRODUCTS...continued from 53

isolated balanced outputs. Integratedcircuits are used to achieve the follow-ing manufacturers performance char-acteristics: 25dB gain; +20dB outputmaximum; 0.1% or less distortion;±0.5dB response; 10Hz-20kHz. The

unique circuitry allows the outputs towork into any impedance over 1250without affecting either response ordistortion. The unit contains its owninternal power supply and operates off115v ac/60Hz. Ramko Research.

FIELD STRENGTH METER

Designed for theantenna installer

709

A low-cost antenna installation me-ter, Model FS -380, reportedly mea-sures absolute voltage levels, identifiespicture and soundcarriers, identifiesinterfering sta-tions, measuresdaily signal fluctu-ations and is veryhelpful for con-ducting antennasurveys and settingup multiple antenna installations. Itfeatures a VHF range of 25 to10,000p,v (both ranges easily increasedby using fixed external input pads).DBmv scales from -20 to +40dBmv,separate VHF and UHF tuning sec-tions, a phone jack for identifyingsound carriers (earphone provided),easy built-in calibration, standard"F" connectors, completely portable,measures all 82 TV channel picturesand sound levels as well as all carriersbetween 88 and 174MHz. The unit issupplied with a rugged carrying caseand powered by a 9v battery. Wine-gard Co.

MULTI -TESTER 710

Taut -band suspension meterwith decibel scale

Introduced is the 22 -range "benchstyle" Multi -tester, No. H3-365, withdecibel scale and featuring a taut -band suspension that enables its indi-

cating needle to be set at any positionup to center scale. The units fused

circuits prevent accidental overloadsor burnout, and it is equipped with aspecial switch for polarity inversion.GC Electronics.

ELECTRONIC TOOL KIT 711

25 professional toolsin heavy-duty roll pouch

A new roll pouch kit containing25 professional tools is designed pri-marily for service technicians, andadvanced students of electronics. Theentire assortment is neatly packagedin a heavy-duty roll pouch. Tools re-portedly included in the JTK-80 kitare a soldering iron, double -end sol-der aid, combination wire stripper/cutter, reverse action heat -sink tweez-

ers, 8 -in. adjustable wrench, six -keyhex wrench set, six -key spline wrenchset, two Phillips driver blades (No. 1and 2), two regular -slot driver blades(3/16 in. and 5/16 in.), four nut -driver blades (3/ 16 in., 1/4 in., 5/16in., and 3/4 in.), two handles for thedriver blades, two pocket screwdriv-ers (No. 0 Phillips and 3/32 in. reg-ular -slot), a general purpose align-ment tool, burnisher, electrician'spocket knife, long nose pliers (6 in.),miniature chain -nose pliers (43/4 in.),miniature diagonal cutters (41/4 in.),a pair of slip -lock pliers, and a 6 -in.stainless steel scale. Jensen Tools andAlloys.

AUDIO CONNECTOR 712

Can be made up asmale or female gender

A new advanced series of miniatur-ized connectors is designed with in-terchangeable inserts which allow anyplug or receptacle to be male or fe-male. Interchangeable inserts provide

the user with maximum flexibility.The connector is designed so that thehousing shields internal connections

and provides ground (common) con-nections without using a pin/contact.Inserts, molded of stable high -strengthblack plastic, are completely inter-changeable between plug and recep-tacle housings at anytime. These in-serts are keyed to housings and maleand female inserts are polarized toprevent mismating. The cord plug ac-cepts cables up to 9/32 -in. O.D. Re-ceptacles are designed for flangemount, rear or front panel locknutmount. Switchcraft, Inc.

VISE 713

Holds material inpractically any position

Designed is a vise called PanaVisethat rotates the locking base 360°,full circle. The vice head revolves 360°

and the tilt actionis 180°. The toolholds the materialfirmly in place andby the adjustmentof one pressureknob, the crafts-man can place thework in any de-sired position. It is

reportedly easily rotated, tipped, tilt-ed, elevated, lowered, moved left orright or turned over. Colbert Indus-tries.

TAPE -HEAD CLEANER 714

Formulated spray solventfor all tape heads

A specially formulated aerosol spraysolvent for cleaning of broadcast, in-dustrial and home entertainment tapeheads is available.Designated CD -270, the non-flam-mable, non-conduc-tive and odorlessspray reportedlycontains no abra-sive chemicalswhich might causeundue wear on capstans, tape heads orany other ingredient which may causeplastic parts to degrade. The solvent


These new IR devicesmake replacing Zenith

emiconductors aocal buy...everywhere!

Now you can buy International Rectifier's "Guaran-teed" replacements for the most popular Zenith semi-conductors right at your local IR distributor. Besidescutting days from the usual ordering -shipping cycle,they're priced locally too - more than competitive withthe Zenith pricing structure.

Like everyone, we recognize Zenith's equipment istop quality, and we're not about to compromise theirname, or ours. We analyzed circuits and devices forfive months before we guaranteed that IR's deviceswill match,and meet or exceed Zenith's electrical andphysical parameters in ail applications.

Right now you can pick up a kit* of 23 IR semicon-ductors, and save an additional 10%.

Add it all up: Local availability. Local price. Guar-anteed IR replacements for Zenith semiconductors.You can't lose.'13 -Transistors; 5 -ICs; 3 -Rectifiers; 1 -Diode; 1 -Crystal.

INTERNATIONAL- RECTIFIERSemiconductor Division

233 Kansas Street, El Segundo, California 90245, Phone (213) 6786281. for more details circle 117 on Reader Service Card

rioR


NEW PRODUCTScontinued from page 55

was especially designed for use withbroadcast VTR's, tape mechanismsand professional high -quality audiodecks and reportedly will not affectany delicate mechanisms, leave residuewhile removing dust, dirt or atmo-spheric film deposits. Cole -Flex Corp.

CASSETTE HEAD ALIGNER 715

Allows precision alignmentof height, zenith and azimuth

A new instrument, the Collimeter V,is designed for rapid, accurate headand guide alignment of cassette re-corders. The instrument allows pre-cision alignment in all three axis -height, zenith and azimuth -offeringmore consistent tape tracking, repro-duction and fidelity. The instrumentis designed for use with all stereo and

T & TVALUE SALERAYTHEON NEW JOBBER -BOXED TUBES

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TRANSISTORS EQUN. TO -80% off LIST SK3004-HEP250 (list $1.90 ea.) 5 for $1.90

SK3006-HEP235 (list $2.35 ea.) 5 for $2.35SK3009-HEP230 (list $3.90 ea.) 5 for $3.90

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GENERAL3 Amp. 1D00PIV Rectifier 40 for $5.00Philco Color Fly-Equiv. Y109 Yoke $4.95Philco Color Fly -32-10132-1 $4.95RCA Color Fly -109221 $4.95

CAPS340MFD at 250v 10 at 250v 3 for $1.00200MFD at 350v 40 at 350v 3 for $1.00250MFD at 150v Mallory 3 for $1.00100MFD at 250v Sprag 3 for $1.00150MFD at 150v Sprag 3 for $1.0020 Asst. Mylor Caps $2.00

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BROOKLYN, N. Y. 11234Phone: (212) 241-5940

mono machines by home and auto ser-vice technicians. By employing preci-sion scribe lines and a magnified view-ing window, the user is allowed tocheck and or adjust guides and heads

easier and more rapidly than before.In addition, it enables checks of headwear with a special wear pattern fluidincluded. It also comes complete withits own illumination source and stor-age case. Ramko Research.

TONE GENERATORMicrophone -levelsignal source

band accuracies of 0.7% to 0.9%.

The ac current ranges reportedly cov-er five decades from 0.1/La resolutionto 2a, with the same frequency rangeas ac voltage; while the dc currentranges span seven full-scale decades,with overall sensitivity of Ina to 2a.Full range voltage drop is only 10mvexcept on the la range where it is100mv. Resistance ranges also coverseven decades, with 0.111 to 200Msensitivity. The instrument reportedlyprovides better than 60dB rejection ofline -frequency noise that may be sup-erimposed on an input signal. Keith -ley Instruments Inc.

716 VOLT/OHM METER 718

Offers protection againstreversal and overload

The Model A I 5TG Tone Genera-tor is a portable, self -powered, micro-phone -level signal source which canbe used in setting up and trouble-shooting audio equipment in record-ing, broadcasting, or sound reinforce-ment applications. The generatorreportedly will drive low -impedance,balanced -line inputs like those nor-mally used in conjunction with thecompany's A 15 Series products.Housed in a 3/4 -in. diameter case, ithas a professional three -pin male con-

nector at the output end. The oppo-site end houses a miniature mercurybattery with a threaded end cap forreplacement of the battery. ShureBrothers Inc.

DIGITAL AC/DC MULTIMETERFully -automatic 717

with 31/2 -digit readout

The Model 165 AC/ DC DigitalMultimeter is said to include suchfeatures as 10ittv ac and dc resolu-tion, ac and dc current resis-tance, high-level overload protectionwithout fuses, and a large direct -read-ing LED display. On the six ac voltageranges it is designed to permit measure-ments over a wide frequency range of20Hz to 20kHz with specified mid -

A VOM, Model LT -70, is designedwith full protection against polarityreversal and overload. The meter willreportedly read as low as 0.25v fullscale and 250/La on normal readingsfor measurements of small solid-statedc voltages and currents. LI scales arealso said to be included for measuringback currents as low as 75/La to check

diode and transistor quality. Its sensi-tivity is reportedly 20K/v dc and8K/v ac, with resistances rated up to40M. Other specifications include thefollowing: nine current ranges; DC-75/.La to 2.5a and AC -2.5a. Voltageranges from 0.25v to 1 kv DC (10steps) and 10v to 250v ac (3 steps).The output in the 10v range of -20to +22dB, ac and in the 50v range


56 I ELECTRONIC TECHNICIAN/DEALER, NOVEMB ER 1973

of +20 to +36dB ac. It is poweredby two I.5v batteries and one 22.5vbattery. The instrument measures534 in. H by 4 in. W by 21/4 in. D.Leader Instruments Corp.

cigarette packageconditions rangingfrom bright sun-light to subduedroom light is de-veloped. The Mod-el MV -100 camerais the first in a se-ries that utilizecharge -coupled de-vice (CCD) sen-sors in place ofconventional vidi-con tubes. The re-sult is a camerathat is extremelysmall (measuring31/2 by 11/2 by 21/4 -in.) and light-weight (6 oz), haslow power con-sumption ( I w) andoperates under awide dynamicrange of light levels. The camera usesan array of 10,000 photosensors as-sembled on a standard 24 -pin dual -in -line package. The CCD sensors arebasically hulk silicon that releasecharge carriers in proportion to theamount of light reflected from thescene. These charge carriers are trans-ferred by a clocking system and trans-mitted to a TV receiver as standardTV signals. Fairchild.

TV CAMERA 719

Charge -coupled device sensorsused in place of vidicon tube

An all solid-state TV camerathat is approximately the size of a

and operates in

TRANSISTOR TESTER 720

Tests Bipolar transistorin circuit

A Model 120 Automatic TransistorTester is designed to quickly isolatefaulty transistors in -or -out -of -circuit.The unit will reportedly operate in al-most any circuit where curve tracersfail, executing a two-phase test se-quence so that testing becomes pos-sible in low impedance circuits. RF,audio and regulator transistors are saidto now he tested reliably, in -circuit.Three LEDs indicate if the transistoris an NPN, PNP or faulty. Conve-niently packaged, the tester reportedlyincludes rechargeable Ni-Cad batteriesand an in -circuit probe. Testline In-struments.

EVGAME makesreplacing cartridges a snap.

We offer virtually all originals or exactreplacements. No one else comes close.

Here s an example of what that means to you:

UNRETOUCHED PHOTO

UNRE TOUCHED PHOTO

414

UNRE TOUCHED PHOTO

THE ORIGINAL

EV 26First production stereo cartridge evermade. Typical of cartridges you replaceevery day.

THE EXACT REPLACEMENT

EV 26In every way a perfect match - sameshape, size, color and quality. Installseasily in torte arm. No instruction neces-sary. Accepts original needle.

THE SUBSTITUTE

133Cartridge shape and needle are different.Requires replacing mounting hardware,installing a grounding strap and solderingnew terminal lugs to the cables. Will notaccept original needle. Reading required:More than 300 words of instruction.

Tools you may need for a substitute

So if you want hardware, go to a hardware store. But if you want to save time andeffort replacing cartridges, specify Electro-Voice at your EV Game distributor. WithElectro-Voice, you don't need special tools or parts. There's no unusual handling orinstallation. The result is that you have the best chance to maximize cartridge profitsand customer satisfaction with EV Game.

See your local distributor for Electro-Voice replacement cartridges. Also askhim for the new EV Game catalog. It's the most comprehensive and easiest -to -use.Simplifies selection of nearly 700 cartridges. And write to us for our revealingReplacement Cartridge Comparison Chart. Learn more about why we make it a snapfor you :o replace cartridges. EV Game. Inc., Box 711, Freeport, N.Y. 11520.

EVGAME inc.DiviSION OF ELECTRO-VOICE INC A GUIICIn COMPANY

In Canada. E -V of Canada. Ltd Gananoque. Ontario



DEALER SHOWCASE

For additional information on productsdescribed in this section, circle thenumbers on Reader Service Card.Requests will be handled promptly.

REPERTORY DIALER

Compatibility to meet alldomestic telephone standards

A contemporary 50 address reper-tory dialer, the Acro-Dial 50, is de-signed to handle over 85 percent of

the market needs. The unit is report-edly an economical desk or wallmounted module that meets telephonecompany standards. Simple two -wireconnection is quickly attached to anyphone and does not require specialtools. It is conveniently programmed

by removing address cards and writ-ing in the name of the party to bedialed, reinsert, plug-in programmerand dial the number. For reliability, ithas minimal mechanical drives andsolid-state electronic circuits. Themagnetic storage medium uses longwearing chromium dioxide tape. Thedimensions of the unit are 21/4 in. H

721 by 4 11/ 16 in. W by 10 in. L and itis molded of high -impact plastic. Ac-ron Corp.

TAPE PLAYER CLEANING KITContains the correct 722recorder care product

The Model QM -7 inspection andcleaning kit is produced for all eight -track cartridge machines. The kit is

said to contain ex-actly the right re-corder care prod-ucts required to in-spect and clean therecorder. The In-spection & Clean-ing Kit contains

one each of QM -103 Spray Tape/Head Cleaner, QM -182 Head/CapstanCleaner, QM -504 Maintenance Brushand QM -509 Inspection Light. Nor-tronic Co. Inc.

REMOTE TV CHANNEL CHANGER

Changes channels and 723turns TV set ON or OFF

Introduced is the Daltone TV Chan-nel Changer which reportedly con-verts any standard rotary knob tunerinto a wireless remote control TV. Thewireless remote control unit changesall VHF channels and can turn the TV

set ON or OFF. Requiring no specialtools, installation is simple-removethe channel selector knob from yourTV set and replace it with the Chan-nel Selector Dial. Then plug in theline cord from the unit to an ac out-let. By simply pressing the channelchanger button on the remote unit,channels change on command fromanywhere in the room. Channel selec-tions may also be used manually if de-sired. Dalamal Electronics Corp.

Everything you need for complete tape recorder testing.Ferrograph RTS-2 with Auxiliary Unit

Versatile all -in -oneprecision test systemIt's a Sine Wave generator ...Millivoltmeter ... Wow & Flutter bridge... Harmonic Distortion analyzer that youcan learn to use in minutes. Requiring onlytwo leads, setup time is minimal.Pushbutton controls provide rapid, preciseoperation. Compact and lightweight, it'sideal for recording and broadcast studios,testing labs and service shops.

Vastly expanded operationBy combining the RTS-2 with the ATUAuxiliary Unit, you're ready for the mostsophisticated audio testing. Monitorspre-recorded test alignment tape with

RTS-2 Test Set - $1450ATU Auxiliary Unit - $560

Carrying cases optional

built-in speaker unit Balanced andunbalanced input/output. Switchesbetween left/right input/output channels.Provides matching impedances for 80,2000, 6000 impedances, or unloaded. Compares input/output signals NABweighted noise filter network for S/Nmeasurements Oscillator output may beset in 10dB increments over 49cIB rangeby pushbuttons Designed for use withvirtually any test equipment.

New, ConvenientLeasing Plan!Try this unique, complete test system Freefor 30 days. Write for details.

ELPA MARKETING INDUSTRIES, INC., New Hyde Park, N.Y. 11040. . . for more details circle 110 on Reader Service Card


TWO-WAY RADIO

Plug-in modular constructionfor simplified servicing

An ultra -compact two-way radio,Model FM545, features plug-in modu-lar construction for simplified servic-ing. Sophisticated"dual phase -lockloop" circuitry re-portedly keeps thereceiver on fre-quency even if thetransmitter beingreceived shoulddrift off frequency.The unit is said tobe rugged, reliableand watertight toCoast Guard speci-fications (option-al). The ruggedaluminum frameand high impactpolycarbonate cov-er can reportedlywithstand the rough treatment a port-able radio can receive. The two-wayradio set measures 6.8 in. H by 2.6 in.W by 1.5 in. D and weighs 21 oz. E.F. Johnson Co.

CASSETTE RECORDER 725

Low cost, with built-in condensershut-off

A Model 6393 Cassette Player/Re-corder is designed to appeal to the col-

lege and youth market. The portableac/dc unit has a sensitive built-in con-denser mike and automatic shut-off. Italso features built-in ACL, piano -keycontrols, wood -grain styling and goodtonal quality. Channel Master.

TELEPHONE RECORDER 726

Monitors any phone orits extension in use

A compact Automatic Line -Switch-ing Telephone Recorder System,Phone-Chek, Model PC-Four-CT5 isdesigned to automatically monitoryour telephone conversations whenany phone or any of its extensions are

724 in use. You may use your phone todictate, record your answering servicepick-ups, record incoming orders, etc.,

all automatically on a standard cas-sette recorder. This "Call -Track Sys-tem" consists of a new compacttelephone recorder and a switchingcoupler. Usable with any modelPhone-Chek system, the coupler tracksthe user's calls on an office -type multi -line telephone. What ever line is beingused, the coupler automatically con-tacts the line in use. The unit measures2 in. by 4 in. by 6 in. and acceptsstandard cassettes up to 90 minutesper side. Answer Line Assoc. Inc.

PORTABLE B/W TV 727

All solid-state circuitryand operates on ac or dc

A new B/W -TV receiver with an11 -in. (measured diagonally) screenis introduced. The compact unit re-portedly weighs alittle more than 14lb. and can be car-ried easily fromroom to room, oroutside the home.The set has allsolid-state circuit-ry and operates onac or dc. The con-trols are frontmounted as is the speaker. A ear-phone is provided for private listeningand it comes in a black with chrometrim cabinet. Sony Corp. of America.

SSB CB TRANSCEIVER 728

Small enough forany mobile application

The Sidebander 111. a 23 channel

SSB only Citizens Band transceiver,

ECG 128 690 Ea.ECG 152 59e Ea.SK 3018 59e Ea.

SK 3011 5110 Ea2N3054 611 Ea.2N3055 79e Ea.

has eliminated AM transmitter com-ponents to permit the radio to be re-duced to a size small enough for anymobile application. Features includepublic address, noise blanker, a backlighted meter, plug-in microphone,plus all the necessary controls forproper SSB operation. The product,which is reportedly completely synthe-sized for 23 channel operation, has adouble -conversion receiver with sensi-tivity better than 1µv. The unit mea-sures 2 1/16 in. by 57/8 in. by 87/3 in.and weighs 4 lb. Linear Systems Inc.

NATION-WIDETUBE & TRANSISTOR CO.OUR 20th MAIL ORDER YEAR

ORIGINATORSOF

Tubes304

$27 per 100Some Slightly Higher

ORDER NOWFrom This

Sample Listing3HQ5 6GF7SCG8 6GH85U4 6HB76AH4 6HQ56AU6 6.1H66AY3 6KT86BZ6 6LM86CG8 128E66DT6 15KY86DW4 17JN66EA7 35Z46FQ7 6973100's of Types

Available at30e Each!

DISCOUNT TRANSISTORS(Sylvania & RCA Types)

10 for S610 for $510 for $510 for $510 for $610 for S7

ERIE HI Voltoge Test Probe Weth Every Order 01$!S0 Or More from Our 30, Tube Losteng And OrOrr 011.1.0.f TIOnS11.1 ldsteng Probe Reads fromZro To 30,000 Volts DC Moy Be Bought Outreghtter 32395 Prepord Every TV Shop Needs One

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

SEND FOR FREE COMPLETE LIST!Magarin» Special11 Month Only)

Jensen 4" Speakers51.49 Each

10 for 513.50(Prepaid)

TUNER REPAIRAay Tuner Rebuilt

$8.99VHF or UHF

All parts included.Tubes. transistors. nu -vistas extra. Send only$8.99 plus $1 ship-ping. Repaired tunerwill be returned pre-paid along with jobsheet and shipping la-bels for future repairs.Mutilated tuners willbe replaced at discountprices. All repairsguaranteed for 1 year!

SOLID-STATEREPAIR

Radios( twine or auto),stereos. cassettes. 8 -tracks. B&W transistorTV's. etc. Sample Re-pair Charge: AM Ra-dio, $3.95 plus parts.8 -Track Stereo. $9.95plus parts. B&W TV(transistor). $12.95

plus parts. Wrap unitscarefully. Send all bro-ken parts. List natureof complaint. SENDNO MONEY! Repairedunits will be returnedCOD. All repairs guar-anteed 3 months. Sendfor free job sheet &shipping labels!

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-WIDETUBE & TRANSISTOR CO.

1275 Stuyvesant Ave..Union, N.J. 07083Tel (201) 688.1414 Dept. ET11



TECHNICALLITERATURE

Speakers

Illustrated literature provides com-plete mechanical and electrical data,application recommendations and alist of options for the seven -modelWR/WT line of element -protectedspeakers. The all -metal single and co-axial units are said to provide musicfidelity, high intelligibility voice sig-nals and intercom efficiency for appli-cations including hotels/motels, leisureareas, shopping malls, schools, serviceand industrial facilities. Atlas Sound,Division of American Trading andProduction Corp., 10 Pomeroy Rd.,Parsippany, N.J. 07054.

Electrolytic CapacitorsA 56 -page replacement guide for

electrolytic twist prong capacitorslists 276 capacitors that can reportedlyreplace 97% of all the twist prongunits now in service. The brochuretabulates the capacitors in three ways;by catalog number, OEM number(manufacturer's name) and by ratings.Cornell Dubilier Electronics, 150Ave. L, Newark, N. J. 07101.

Phono CartridgesA new phono-cartridge catalog, that

is claimed to be the most completeguide ever published, includes a set -model -to -cartridge listing which makespossible the identification of a replace-ment cartridge for thousands of setswithout knowing the make and modelof the cartridge. Compiled over fiveyears of study and research, this exclu-sive reference simplifies the duplica-tion of correct replacements for mostof the major U.S. and many foreign

makes. Cross-indexing is also providedby cartridge make and model numberas well as by visual methods which in-cludes measurements of Japanese re-placements that are difficult to identi-fy. Pfanstiehl, 3300 Washington St.,Waukegan, Ill. 60085.

Test InstrumentsA 16 -page test instrument catalog,

No. 59-T, features an easy -to -readtester selection guide that allows directcomparison of performance character-istics of each model. The catalog liststhe full range of VOM's and accesso-ries, including general-purpose, spe-cial -feature, laboratory -accuracy, digi-tal FET portables, leakage adaptors,cases, shunts, probes, and tester stands.Each model is shown with its techni-cal characteristics and price detailed,and its most pertinent performancefeatures succinctly listed. The handyselection chart gives a quick compari-son of ohmmeter, ac and dc voltages,and dc current readings, complete withranges, number of ranges, sensitivityand accuracy. Triplett Corp., Bluffton,Ohio 45817.

Engineering Manual andPurchasing Guide

An Engineering Manual and Pur-chasing Guide, Catalog No. 740, in-cludes engineering drawings of all in-cluded electrical components. Allphysical dimensions are given to allowefficient design of electronic "pack-ages" before components are pur-chased and the electrical properties ofall items are included. These includeIC's, LED's, tubes, relays, timers,transformers, resistors, capacitors,connectors, coils, chokes, sockets,plugs, jacks, switches, fuses, batteries,clips, lamps, wire and cable, test equip-ment, intercoms, power supplies, elec-tronic counters, sound systems, chemi-cals, hooks, tools and equipment. Any -

FOR THE PROFESSIONAL M.A.T.V. AND ANTENNA INSTALLER A UHF,VHF T.V.-FM FIELD STRENGTH METER

Finest inits Class

SADELCO FS -719Only s248"

LIGHTWEIGHT! PORTABLE!ACCURATE!

For the name of your local distributor contact:

SADELCO, INC.299 Park Ave., Weehawken, N. J. 07087 (201) 866-0912

The Largest Manufacturer of TV Field Strength Meters in the U.S A

one can now obtain their catalog forthe cost of postage and handling for$1.00. Allied Electronics, 2400 W.Washington Blvd., Chicago, III. 60612.

Soldering EquipmentA four -page catalog, No. 240-CP,

describes conduction and resistancetype soldering equipment, thermalwirestrippers, tubing shrinkers and ul-trasonic cleaners. Also included is in-formation on special catalogs listinghundreds of AB industrial solderingproducts. A. E. H. Co., 6110 CassAve., Detroit, Mich. 48202.

Audio Equipment Selling GuideA selling guide called "The Hitachi

Maxi-Fi Guide," is a compilation ofaudio basics written to be used by re-tail salesmen. It is a primer and intro-duction to the most commonly usedaudio terms. Complete with defini-tions, illustrations and diagrams, itruns the gamut from "acoustic suspen-sion speaker" all the way through"woofer" and "wow." As a special fea-ture, it includes one of the clearest ex-planations anywhere of the varioussystems for four -channel sound. Ad-vertising Dept., Hitachi Sales Corpora-tion of America, 48-50 34th St., LongIsland City, N.Y. 11101.

CCTV Equipment and AccessoriesA 15 -page distributor price schedule

for 1973 is now available from one ofthe largest suppliers of CCTV acces-sories and equipment in the U.S.A.GBC Closed Circuit TV Corp., 74Fifth Ave., New York, N.Y. 10011.

Digital Timing and MeasuringDevices

A colorful six -page catalog is avail-able describing a total line of digitalproducts. Listed are low-cost program-ming instruments and controls, tim-ers, clocks, counting and measuringdevices. Also included is a completelisting of modular display units forcustom digital instrumentation and asection outlining their digital clock,multimeter and frequency counterkits. E S Enterprises, 10418 LaCienega Blvd., Inglewood, Calif.90304.

Wire and CableA 72 -page publication features a

wide line of wire and cable productswith a host of new designs. Amongthe new products is a miniature two-


60 I ELECTRONIC TECHNICIAN, DEALER, NOVEMBER 1973

conductor shielded cable designed forautomatic stripping equipment. an ex-panded line of multiple -pair audiocables, a new line of audio, data,sound and control cables supplied inpolyethylene conduit for direct burialand lines of preterminated coaxial TVand CB -amateur cables. A full sectionof the catalog is devoted to a range ofappliance, power -supply and exten-sion cords. Also featured are micro-phone cables, retractile cords andcables, antenna rotator cables, hookupwire, etc. There are cable selectorcharts also included. Belden Corp.,Electronic Div., 2000 S. Batavia Ave.,Geneva, III. 60134.

Soldering ToolsA full -line catalog, No. 523, on

soldering tools is now available, whichis condensed and simplified for theconsumer, covering all mainline prod-ucts with accents on pre -assembledsoldering kits. Informative instruc-tions are given for tip use and main-tenance, an all important feature ofthe catalog. Soldering irons, desolder-ing equipment, production aids and anew heat gun are also featured. Un-gar, Div. of Eldon Industries, Inc.,233 E. Manville, Compton, Calif.90220.

Tools

A 96 -page handbook, "Tools forElectronic Assembly and PrecisionMechanics," is available. The cata-logue describes over 1900 individualitems of particular interest. A soldersection lists tin -lead alloys as well aseutectic alloys, copper -bearing, core -less, silver -bearing, aluminum and lowmelting -point solders. Also featuredare four pages of technical data ontool selection. Jensen Tools and Alloys,4117 N. 44th St., Phoenix, Ariz.85018.

Outdoor AntennasAn outdoor antenna full -line chart,

called "Increase Your Viewing Plea-sure" is now available. This chart is acomplete buyers and sellers guide tooutdoor antennas-UHF-VHF/FM,VHF/FM, UHF -only, FM -only; rota-tors, including the newly introducedSelecta-channel 10W606; three differ-ent types of antenna mounting kitsand a revolutionary new Mini -Stateantenna system with an exclusivehand-held rotator remote control unit.Used as a point -of -purchase piece,this full -color 11- by 44 -in. chart per-mits dealers to show the variety of an-tennas to fill any need, the inside com-

ponents of the Mini -State antenna andcabinet design of the rotators. It alsolists the components of the antennamounting kits that are available. RCAParts and Accessories, P.O. Box 100,Deptford, N.J. 08096.

Electronic Components andEquipment

A 68 -page catalog, No. FR -73-A,is available featuring over 570 items-illustrated, described and priced.Everything necessary for the propercare and maintenance of sound equip-ment, plus a complete assortment ofsecurity alarms, antennas and installa-tion hardware are covered. GC Elec-tronics Division of Hydrometals, Inc.,400 South Wyman, Rockford, Ill.

Chemical Sprays

A four -page catalog is available onthe company's specially formulatedline of industrial grade chemical aero-sol sprays. The catalog includes pho-tographs, applications and governmentspecifications for: Contact CleanerElectrical grade; 1, 1, 1, Trichloro-ethane Solvent and Cleaner; MagneticTape Head Cleaner; Solder Flux Re-mover and Cleaner; High -Tempera-ture Dry Lubricant; Demoisturizerand Water Repellent Lubricant andthe Teflon Dry Lubricant and MoldRelease. Cole -Flex Corporation, 91Cabot St., W. Babylon, N.Y. 11704.

Communications EquipmentAn 18 -page color brochure is avail-

able entitled "Extensions of Controlfor Physical Distribution," describingthe impact communications equip-ment can have on physical distribu-tion efficiency. It covers a wide varietyof communication equipment applica-

tions that can significantly reducephysical distribution costs and im-prove overall operational efficiency.Mobile radios, mobile teleprinters,portable radios, radio pagers andCCTV are only a few of the types ofequipment mentioned. Motorola Com-munications and Electronics, Inc.,1301 E. Algonquin Rd., Schaumburg,Ill. 60172.

Phono Parts

A 240 -page catalog listing over 690phonograph cartridges, 650 phono-graph needles, 400 wheels and belts,plus a complete listing of phonographchanger motors, center posts, 45adaptors, plug-in heads, shells, car-tridge mounts and many accessoryitems is now available. There arenumerical, alphabetical and sectionalindexes. Each product line is tab in-dexed. The catalog can be obtainedthrough any EVGame distributor.

"The wife insisted that I quit trying to fix ourTV!"

CORNELL ELECTRONICS COMPANYTHE ORIGINAL

HOME OF

100 HMS 011 MOBS33cPee TUBE

4213 N. UNIVERSITY AVE. SAN DIEGO CALIF. 92105Same Low Price * Bargain Tools

East or West Coast!* Transistor Tester* Techn cian's Library

ONE YEARGUARANTEE

INDIVIDUALLYBOXED

5 DAY MONEYBACK OFFER

LAB TESTED USED

SEND FOR FREE

NEW 48 PAGECOLOR CATALOG

* Dumcnt Picture Tubes* Diodes-Transistors-Kits* Tube Cartons

SPECIALOFFER

ON ALL ORDERSOVER $10.00

25cPER TUBEI. LIMIT,

FROM THIS LIST

6AG5 6CB66AU6 616

6SN7

Your Order FREE if Not Shipped in 24 Hours... for more details circle 107 on Reader Service Card


All NEW FROM ENDECO

the (*solderingiron with alight

usive new safety lightshows when power is on

MODEL 510 $15.95 NET

Three-way on -idle -off switch . Operates at40w; idles at 20w for longer tip life 6 tipsizes available to handle any job Cool, un-breakable polycarbonate handle Burn -re-sistant neoprene cord Exclusive new bracketinsures alignment, prevents damage 8,/2"long, 372 oz Also soldering irons and solder-ing/desoldering kits.See your distributor or write .

5127 EAST 65TH ST.INDIANAPOLIS,INDIANA 46220PHONE 317/251-1231

enterprisedevecorporation


FREE ALARM CATAFull line of professional burglarand fire alarm systems and sup-plies. 80 pages, 400 items. Off -the shelf delivery, quantityprices.

mountain west alarm..f 4215 n. 16th st., phoenix, az. 85


FREE CATALOGHARD -TO -FIND PRECISION TOOLS

Lists more than 1700 Rents-pliers,tweezers, wire strippers, vacuum systems,relay tools, optical equipment, tool kitsand cases. Also includes fotw pages ofuseful "Tool Tine to aid in tool selection.

E.INTEE1,7 TOOLS4117 N. 44th Street, Phoen, A.. 85018

FOOLS_


+Sign ofthe goodneighbor.

The American Red Cross

osloortiefog contribotod fro the pubhe good.06

ct-

READERS

SERVICE

INDEX

ADVERTISER'S INDEX

American Telephone and Telegraph 24101 Antennacraft 13102 Arrow Fastener 11

103 B & K Dynascan 6104 Book Club-Tab Books 36.39131 Book Club-Schematic 45105 Centralab Electronics Div. 54106 Chemtronics 53107 Cornell Electronics 61108 Delta Products 52109 Eico Instruments 47110 Elpa Marketing Industries 58111 Enterprise Development Corp. 62112 E -V Game 57113 Finney Co. 5114 Fordham 62115 GC Electronics 16

GTE Sylvania Consumer RenewalSemiconductors 3Tubes .. 12

116 Heath Company 18-21117 International Rectifier 55118 Jensen Tools 62119 Jerrold Electronics 17120 Leader Instruments Corp. Cover 3121 Motorola Training Institute 47122 Mountain West Alarm 62123 Nationwide Tube and Transistor Co. 59124 Oneida Electronic Mfg. 50

Panasonic 10134 Precision Tuner Service Cover 2125 RCA Electronic Components 48126 Sadelco, Inc. 60127 Sprague 9128 Telematic 49129 T & T Sales 56130 Triplett Corp. Cover 4132 Workman Electronic Components ....23133 Xcelite 8

Zenith Radio Corp. 14-15

NEW PRODUCTS

700 Hand Truck701 Oscilloscope702 Soldering Gun703 Sound Level Meter704 MAN Tap Off705 Picture Tube Tester706 Antenna707 Solder Vacuum708 Audio Distribution Amplifier709 Field Strength Meter710 Multi -Tester711 Electronic Tool Kit712 Audio Connector713 Vise714 Tape Head Cleaner715 Cassette Head Aligner716 Tone Generator717 Digital AC/DC Multimeter718 Volt/Ohm Meter719 N Camera720 Transistor Tester721 Repertory Dialer722 Tape Player Cleaning Kit723 Remote N Channel Changer724 Two -Way Radio725 Cassette Recorder726 Telephone Recorder727 Portable B/W N728 SSB CB Transceiver

TEST INSTRUMENT

2222225252525253535454545455555656565657575858585959595959

900 Triplett's Model 8035 Digital VOM 44

DISCOUNTTEST

EQUIPMENTSPECIALISTS

EIC0-2-7COMPLETE LINE OF ELECTRONIC SUPPLIES

ICC/Mullard & Raytheon TubesTelematic Test Rigs

FREE CATALOG

FORDHAMRadio Supply Co., Inc.

558 Morris Ave., Bronx, N.Y. 10451Tel: (212) 585-0330


STATEMENT REQUIRED BY THE ACT OF OCTOBER 23,1962 (39 U.S. Code, 4369) SHOWING THE OWNER-SHIP, MANAGEMENT AND CIRCULATION OF ELEC-TRONIC TECHNICIAN/DEALER published monthly byHarcourt Brace Jovanovich, Inc., 757 Third Avenue,New York, New York 10017, for November 1973.

1. The names and addresses of the publisher,editor and managing editor are: Publisher, AlfredA. Menegus, 757 Third Avenue, New York, NewYork 10017; Editor, Phillip Dahlen, 1 East FirstStreet, Duluth, Minnesota 55802; Managing Editor,Joseph Zauhar, 1 East First Street, Duluth, Minne-sota 55802.

2. The owner is: Harcourt Brace Jovanovich, Inc.,757 Third Avenue, New York, New York 10017.Holders of One Per Cent (1.0%) or more of theoutstanding shares of Harcourt Brace Jovanovich,Inc., as of August 21, 1973: Cede & Co., Box 20,Bowling Green Station, New York, New York; Comp-troller of the State of N.Y. in Trust for the Com-mon Retirement Fund, c/o Directory of the Retire-ment Accounts, Governor Alfred E. Smith Building,Albany, New York 12225; Cudd & Co., P.O. Box1508, New York, New York; Katherine Brace Cum-mings, c/o Ernst Cane Berner & Gitlin, 5 West45th Street, New York, New York 10036; C. A.England & Co., P.O. Box 1368, Church Street Sta-tion, New York, New York 10008; Donald H. Har-court, 2444 Brinkeroff Ave., Santa Ynez, California;Ellen Knowles Harcourt, William I. Jovagovich &Peter J. Ryan as Trustees u/t/a dated 5/23/66, 20Exchange Place, New York, New York 10015; Hast-ings Harcourt, 835 Laguna Street, Santa Barbara,California 93101; Walter J. Johnson, 19 Hewitt Ave-nue, Bronxville, New York 10708; Thekla E. Johnson,19 Hewitt Avenue, Bronxville, New York 10708; Wil-liam Jovanovich, P.O. Box 295, Briarcliff Manor,New York 10510; Live & Co., c/o The Central TrustCompany, Trust Department, Cincinnati, Ohio 45202;Lynn & Co., P.O. Box 2010, Church Street Station,New York, New York 10008; O'Neil & Co., P.O.Box 11028, New York, New York 10049; Ruck &Co., P.O. Box 491, Church Street Station, NewYork, New York 10008; Shaw & Co., P.O. Box 1426,Church Street Station, New York, New York 10015;Sigler & Co., c/o Manufacturers Hanover TrustCompany, New York, New York 10015; Stawis & Co.,P.O. Box 1479, Church Street Station, New York,New York 10008; Joseph C. Sindelar, 794 ParkBoulevard, Glen Ellyn, Illinois 60137; Robert J.Sindelar, 1838 Somerset Lane, Northbrook, Illinois60062.

3. The known bondholders, mortgagees and othersecurity holders owning or holding 1 percent ormore of total amount of bonds, mortgages, or othersecurities are: None.

4. The average number of copies of each issueof this publication sold or distributed, throughthe mails or otherwise, to paid subscribers duringthe 12 months preceding the date shown above was69,386. Free distribution by mail carrier or othermedia: 1,074. Total distribution 70,460.

(Signature) Richard MoellerTreasurer


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SCHEMATIC NO.

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GENERAL ELECTRIC 1497Color TV Chassis 25MB

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MAGNAVOX 1498Color -TV Chassis T981,T982,T987

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NOTES

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1N1CATES LIONEST 14,40 TEST 001NT.PiC0.14. INSANSTI

r ORNATE/ EEO. Men ME USED. INNATE 3 VOLTAGE TOWNE. INDICATES WAVEFORMS COGS PONTS.

S CHARON/4E0NMATURED FROM POINT .P.DlNO TO CHASSIS GROUND

INDICATE *AMENS 1St( CHART 1 NIEFON MINN° KROSSP OSTS PID.CAT TO IR, TO CHASSIS NOUN/ NOLLOSCOPESHOULD NOT SE WNW, TO CHASSIS. SIN( LADSREVERSES WAVEFORM

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INKATES N. NUNES OS MOM SONG

ZENITHColor -TV Chassis17EC45/19EC45

0 1.5V15.75 KHz

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NOT USED

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ONOT USED

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COPYRIGHT 1973 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET DULUTH, MINNESOTA 55802

1497GENERALELECTRICColor -TV Chassis25MB

ELECTRONIC 7----frwE,T7---NOVEMBER 1973COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

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SYMBOL DESCRIPTION GENERAL ELECTRIC PART NO.

R1625-100, 10%, lOw EP14X52R1661 -470K, 10%, 7w EPI4X57R205 -IF AGC, 250n, 20% EP49X142R206-RF AGC, 250n. 20% EP49X142R340-brite limit, 10K, 20% EP49X140R413 -red drive EP49X141R433 -green drove EP49X141R453 -blue drive EP49X141R606 -killer adj 50K. 20% EU49X35R619-chroma gain equal 5K, 30% ES49X627R623 -ACC adj 100K, 20% EP49X143R706 -vent size, 3.5M EP/9X144R709 -vent centerR1113-horiz center 1500 EP49X147R1133 -CRT bias EP49X148R1404-chroma set 50K EU49X35R1408 -tint center 20K EP49X96R1662 -focus pot asm EP62X421207-41.25MHz trap EP36X921215-4.5MHz trap EP36X111DL301-delay line EP36X 105L502 -quad EP36X 107

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fuse .4a 250v fast blo F701 EPIOX18fuse 2.5a 125v slo do F1201 EP10X13fuse .5a 250v fast No F1202 ESIOX43tripler HV HVM 1600 EP62X41tuner VHF solid state EP86X19tuner UHF solid state EP85X13Yoke deflect EP76X10

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PRODUCT SAFETY SHOULD BE CONSIDERED WHEN ACOMPONENT REPLACEMENT IS MADE IN ANY AREAOF A RECEIVER. THE SHADED AREA OF THIS SCHE-MATIC DIAGRAM AND THE PARTS LIST DESIGNATECOMPONENTS IN WHICH SAFETY CAN BE OF SPECIALSIGNIFICANCE. IT IS PARTICULARLY RECOMMENDEDTHAT GENERAL ELECTRIC CATALOGED PARTS OEUSED ron COMPONENT REPLACEMENT IN THE EHADED AREAS OF THIS SCHEMATIC.

I ISF OF SI IRSTITI ITF PFPI FMF NT PARTS WHICH DO

NOT HAVE THE SAME SAFETY CHARACTERISTICS ASRECOMMENDED IN FACTORY SERVICE INFORMATIONMAY CREATE SHOCK, FIRE OR OTHER HAZARDS.

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SYMBOL DESCRIPTION MAGNAVOX PART NO. 1301 -power xformer T981-03 300299 27301 -power *former 1982.01. 02 300310-4

L109-4.5MHz quad coil ..................... 361389.2 T302-horiz output xformer T981 361488-1

L114-3.58MHz output coil 361398.9 7302-horiz output xformer T982 361488-2

7101-chroma bandpau xformer .. ............. 361498-1 R301-HV/focus divider T981 230199-4

R202-vert height 50K 22022620 R301-HV/focus divider T982 T987 230199-3

R203-vert lin 25K 220220-26 R313 -van hold 250K T981 220293.28

R227-horiz hold 1M 220220-38 R313-vert hold 250K T982 220293-30

R302 -focus 12M 220249-4 R313 vert hold 250K 7987 220293.22R308-horiz center 220181.19 R314 -color 10K T981 220293-27

5200 -service switch 160462-1 R314 -color 10K T982 220293-29

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SYMBOL DESCRIPTION

ELTZERME TriV=Z7.4^1COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

AIRLINE PART NO.

C504A, B, C-250 of/165v, 150 of/150v,200 of, 150v, electrolytic 67A30.11

R208,5501 -500K, on/off, volume 75A1.185R320 -30K, video 75A112.13R418 -5M, height 75A101.16R422 -1.2M, vent hold 75A100-8R466 -500K, vent lin 76A101-17L202 -coil, quadrature w/C207 72A132-77

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4.5 MHz, w/C3I5, 314. 316T401-xformer, vert output 79A139-4T402 -deflect yoke 94A372.27403-xformer, horiz output 79A1381CR301-diode, video detector, IN60 93A8-1CR401-diode, horiz phase detector 93A5.9

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COPYRIGHT 1973 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET, DULUTH. MINNESOTA 55802

LBO -502 $529.95

1HE NEW

`r LEADER LBO -502

a;t 5"SOLID STATE

TRIGGERED SCOPE

MAKES VOLTAGE READINGS

AS EASYAS...

The 3 segment "A","B","C" scaleon the lighted graticule is another

example of Leader know-how tohelp you save time, labcr and

money. For this solid state,15MHz bandwidth performer

delivers push button convenience,too - triggering source, slope,

mode and other functions. Add tothis a rectangular bezel, frontpanel adjustable illumination,

scale tilt adjustment and a sepa-rate on -off triggering light. Now,consider the lab grade perform-

ance and the broad range of usesin most every electronic area ...

the LBO -502 is also a vectorscope.Basic specifications include: Auto-matic and Triggered sweep ranges

from 1,usec/cm to 0.5sec/cm, 17steps calibration; magnification is

5X, max sweep 0.2usec/cm andvertical sensitivity is from

10mVp-p/cm to 20Vp-p/cm; band-width is DC to 15MHz and the

rise time is 35 nanoseconds. Com-pact, lightweight and completewith probe, adapter and leads.

a

5

0

10

15

en" grm

"Put us to the test" iluatimilINSTRUMENTS CORP.

151 Dupont StreetPlainview, New York 11803516-822-9300

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

"A" ScaleFor readings in multiplesof 2. from 0 to 6 (- and -)peak to peak.

"B" ScaleFor readings in multiplesof 5. from 0 to 15 ( and -)peak to peak.

"C" ScaleFor readings in multiplesof 1, from 0 to 3 ( and -)peak to peak.

If you want theWorld's most

popular hand -sized V -0-M...Buy Triplett's 310

Handy by virtue of its operatingconvenience and its small size,Triplett's Model 310 V -O -M isno miniature when it comes torugged capability on the job.With outstanding readability,18 ranges, 20,000 Ohms per VoltDC sensitivity (5,000 Ohms perVolt AC) and diode overloadprotection, the 310 can handlepractically every electrical mea-surement you'll need to make.Accuracy on DC is 3%: 4% onAC. Most popular V -O -M of itstype, Triplett's Model 310 is areal value at $46

If you'd prefer the extra rugged-ness of a suspension movement,the extra sensitivity of 15,000Ohms per Volt on AC, the ex-tra reliability of an enclosedrange -switch and the extra con-venience of a DC polarity -

reversing switch, ask for Trip-lett's Model 310-C at $59

Or, if you need the additionalsensitivity of an FET V -O -M with10 megohm DC input, the addi-tional ranges of 300 mV DC andX1 megohm, the additional rug -

1. Hand -size V -O -M with diode overloadprotection.

2. 20,000 ohms per volt DC and 5,000ohms per volt AC.

3. Single range switch; provision forclamp -on AC ammeter.

gedness of a suspension move-ment and the convenience of apolarity -reversing switch, insiston Triplett's Model 310-FET at$78

See them all at your localTriplett distributor or, for a freedemonstration, see him or yourTriplett sales representative.Triplett Corporation, Bluffton,Ohio 45817.

1TTTRIPLETTThe Worlds most complete line of V -0 -M's...choose the one that's lust right for you

For full detailsRepresentative.

Dial Toll -Free 800-645-9200 for nearest TriplettNew York State Call Collect 516-294.0990


cu lat ion - americanradiohistory.com...p.0 box 5794 san diego, calif. 92105 tel. 714.230.1010...

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