Volo1V, No.3.March 1975 Monthly except during July and August Price $14.50 yearly Single Issue 750

Second-class postage paid at Dallas, Texas Office Address: 9820 Silver Meadow Drive, Dallas, Texas .75217

THE NEWSPAPER FORTHE HOBBYIST OF VINTAGEELECTRONICS AND SOUND

HE HORNConcerning My Invention The

AudionB.y LEE DE FOREST

OctoberTwenty-fifth

1922.EDITOR, RADIO BROADCAST,

Garden City, Long Island.DEAR SIR:

My attention has recently been called to anarticle published in the RADIO BROADCAST byProfessor J. H. Morecroft under the title"What Every One Should Know About Wire-less and Its Makers." In this article i findmention of my invention of the Audion andseveral references to the Audion which are byno means in accord with the facts. I am per-suaded that Professor Morecroft in no wayintended to do an injustice to me or your read-ers, and will himself in all fairness welcome abrief statement on the genesis of the Audion.

From time to time the statement has ap-peared, as in the case of the Morecroft article,in effect that in my invention I contributedthe grid to a rectifier or two -element vacuumtube, and thereby created the Audion or thethree -electrode vacuum tube, the present heartand soul of radio communication. What couldbe more simple in the way of an explanation?What at the same time further from the truthand still further from a knowledge of the simplefacts of radio principles?

Professor Mbrecroft says: " It seems strangethat Fleming did not at once jump to the idea

of the Audíon, but the history of science is fullof just such occurrences-a worker on the pointof making an important discovery, yet missingit by the merest chance."

Had Fleming thought of the grid, had heinserted it in the Edison Valve, he would havehad exactly what he did have, a rectifier-butwith a grid -shaped anode-nothing more. HadI come to this stage by the route Fleming fol-lowed, I should have done exactly as Flemingdid-missed it exactly as he missed the Audion.

To recognize that the anode battery circuitis as essential a feature of the Audion as isthe third electrode, that by virtue of this localenergy alone is the Audion a relay device andtherefore an amplifier of transcendent value,instead of a mere rectifier of received alternat-ing current-seems such a simple proposition,so self -apparent, that I have always been at aloss to understand why any one should fail tograsp it. Yet such is the very common positionof many writers: "The Audion is the Flemingvalve with a third electrode." "Its inventorimproved the Fleming valve merely by theaddition of the grid." I doubt if such mis-leading stupidities were elsewhere ever preachedin the history of the electrical art.

Add a third, or any number of electrodes tothe Fleming valve and it remains the Flemingvalve --a mere rectifier, possessing the utilityof the rectifier and nothing more.

Continued on page 2

Practical Pointers on Cabinet Wood -By W. S. STANDIFORD

FLECTRICAL experimenters can makeneat -looking cabinets, but often falldown in their finishing work. It is toobad to get so far along with the con-struction of a set and then omit those

finishing touches that make it a pleasure tolook at and to operate. As crudely finishedapparatus is generally the result of a lack ofknowledge of the processes and materials neededrather than to lack of interest or carelessness,a few practical pointers may prove helpful.

At the outset, it cannot be emphasizedtoo kstrongly that a clean, smooth exterioris necessary in order to get a first-classfinish, whether the wood is to be painted,enameled, oil -finished in natural -colored woods,or varnished. The first thing to do is todecide what kind of wood the box is to be madeof, whether it is open- or close -grained, and alsowhether it contains any sap, as such conditionswill make necessary different methods of work-ing.

Open -grained woods include: Oak, ash,chestnut, walnut, mahogany, and butternut.These require fillers.

Close -grained woods include: Pine, cherry,maple, birch, cypress, whitewood, poplar,sycamore, beech, and redwood. These andothers like them do not need fillers, but can befinished in natural colors or stained, as pre-ferred. Five operations in wood finishing areneeded: sandpapering, staining, filling, varnish-ing, and polishing.

First, plane the wood as smooth as possible.Then tack a piece of No. oo sandpaper on a levelblock of wood and rub with the grain, usingmoderate pressure and taking care when work-ing near the edges, not to round them. Wipeall dust from the surface with a cloth; if anyremains, rough spots in the finished productwill result. Staining comes next, if pine orpoplar are used to imitate the appearanceof more costly woods. By using pine orpoplar, radio cabinets can be made which will

Continued on page, 2

Publisher, Jim Cranshawdar

214-286-1673

MORE PAGESEVERY QUARTER

To give more need-ed space in The HornSpeaker, especiallyafter going to thesmaller format, theMarch, June, Sep-tember and Decembereditions will beplanned for 12 pages.During the period ofa year the newspaperwill have more space.

MANHATTAN ELECTRICAL SUPPLY CO. INC. 23

MESCO ROTARY SPARK GAP

List No. 222

atmospheric disturbances,due to its low frequency

A Rotary Spark Gap is requiredin every transmitting station by theFederal authorities for the reasonthat this type of gap produces apure wave of low damping decre-ment. It also increases the effi-ciency of any transmitting stationfrom 20 to 30 per cent.

This Rotary Spark Gap emits ahigh musical note, more audible tothe human ear, can be heard atgreater distances than the notefrom the stationary type, and can-not be mistaken for static or other

a fault common with the stationary gapnote.

The rotating member has twelve sparking points mounted on ahard rubber disk and is carried on the motor shaft.

The Gap can be successfully used on any of our spark coils ortransformers up to and including 1 K.W. capacity.

It is also fitted with two stationary electrodes with special adjust-ing devices.

Our Standard Globe Motor is used, which will operate on 110A. C. or D. C. circuits and attains a speed of 4,500 R.P.M. Alsomade with our Globe Battery Motor which can be operated on asix volt circuit.

List No. Price222 Mesco Rotary Spark Gap, 8 volts 519.00223 Mesco Rotary Spark Gap, 110 v., A. C. or D. C 20.00218 Rotary Unit only, with two Stationary Electrodes, 1y1

in. shaft 8.00

List No. 485

List No.465 High Efficiency Spark Gap 3450

HIGH EFFICIENCY SPARK GAP.This spark gap is adapted for all

stations from the smallest up to Vs

K. W. capacity. The base is ofpolished hard rubber, and thestandards are of hard rubber com-position of the highest insulatingproperties: The hard rubber endson the brass rods permit the lengthof the gap to be varied while send-ing. Spark terminals are of zinc,as used by commercial stations, andare renewable.

Price

ZINC SPARK GAP.Extensively used for

coils up to 2 inch spark.Base is of polished oak,standards are nickelplated and spark terminalsare of zinc. Hard rubberends are provided so thatthe length of the gap canbe varied while sending.

List No. 487List No.487 Zinc Spark ' Gap

STANDARD SPARK GAP.

List No. 421This spark gap is suitable for all

List No.421 Standard Spark Gap

Price$1.20

The Standard Spark Gap ismounted on a large porcelainbase which insures excellent in-sulation. The gap terminalsare zinc plugs of generous pro-portions mounted on threadedrods so that the spark lengthhas a very fine adjustment. Thehorizontal rods are held in split

binding posts, keeping them inperfect alignment.

stations up to % K. W. capacity.Price32.4(1

From MESCO catalog, 1919

2 The HORN SPEAKER 9820 Silver Meadow Drive, Dallas, Texas 75217

Berliner Grtim-o-phoncs

..A..

$15.00

Type "E"$22.00

Type "B"$28.00

1902 prices

C.,$45.00

FINDS OF THE MONTHFor about a month or two before

Christmas my son and his wife hadbeen looking for an interesting oldradio as a present to add to my col-lection. fis Christmas came closer,they still hadn't found just whatthey were looking for. Then, obey-ing a wifely wish by carrying thetrash from their apartment to thenearby "Dempster", my son spotted astill partly gleaming radio chassisback among the debris. After some"digging", he emerged with one largeand one smaller chassis, intact ex-cept for two tube shields and onebroken tube - a 1936 Scott All -wavehi -fidelity receiver! Diligentpolishing made it a sparkling Chris -

mas present indeed!

Charles J. Hink]eFredericksburg 17:; 22101

I have been real fortunate thispast year. First off I cornered aD-17 DeForest with a DeForest speak-er. Then I located an A -K 5A inDenver and was able to buy it. Areal jewel. Then I got a DeForestF5 Delux with built in speaker. Italso has all original DeForest tubes.Sure does work well. I have sold alot of sets also. Not bad for acountry boy.

On my A K 5A breadboard, thefactory sticker says printed Sept.1923. So, I believe that the 5!:iwas a genuine production model forlast quarter of 1923 and 1924. Nolist has said so as of now. ThoughtI would pass along this bit of in-formation.

Bill MilerGreely, Colorado

DeFORI: ST

The evolution of the Audion patent claimsmarks, in a general way, the evolution of theAudion-first it was a gas effect in the open air,then in an enclosed vessel, then in an exhaustedvessel, exhausted like an incandescent lamp-then to higher and higher degrees of vacuua(as early as 1912 1 employed an X-ray vacuum)But always it was a relay. Always the "B"battery was employed. The control electrodeidea even preceded the enclosed vessel. Andnever was the Audion " the Fleming valve withmerely a grid added."

Professor Morecroft continues: "The thingwhich he (De Forest) actually did, namely, theinsertion of the third electrode into a Flemingvalve, was a most wonderful contribution tothe radio art." It was not. Remember thata mere valve with three electrodes is still only avalve-with one electrode too many.

Unfortunately, prior to the year 1917, verylittle, indeed scarcely anything at all, appearedin radio history concerning the Audion art, al-though nearly a decade had elapsed since myfirst patents were granted on the Audion. It

CABINET FINISHING

look as if an expensive natural -colored woodwere used. In wood finishing, much trouble inworking will be avoided by the purchase of thebest stains and materials obtainable. Thereare two kinds of stains on the market: waterand oil stains, each having their good points.Oil stains are those in which the coloringpigment is dissolved in linseed oil or turpentine;,water is the solvent for the other. As pithwood in some cases has more or sap, this,wood, after being colored with an, ;Qr.water-stain . when dry,should have two coatsof white shellac var-nish applied, eachcoat to be lightlysandpapered afterdrying.

This shellac coatingeffectually keeps anysap from discoloringthe finish; varnishing,rubbing down, a n dpolishing can thenfollow. The best wayto use water- or oil -stains is to apply themwith a brush and then rub them into thewood with a piece of cheese -cloth. This dis-tributes the color evenly and absorbs surplusmoisture (which in the case of water -stainsis apt to raise the grain of wood, thus mak-ing more sandpapering necessary) and alsomakes a uniform color tone. If the firstapplication does not give as deep a coloras is desired, give it another one. If you wantto use an open -grain wood, such as mahoganyor walnut, and use a stain to make it deeperin color, the pores will have tó be filled afterstaining. Otherwise staining can be omitted;but the filling is necessary. Supposing thatsuch a wood has been stained; get a pastefiller of a color to match the stain as nearly aspossible; put some filler on a small piece ofcotton cloth and rub it on the wood. As soonas this filler has dried a little (don't let it gethard) continue to rub the surface until allpores have' been filled up, rubbing off thesurplus, the idea being to have nothing but thepores contain filler.

After it is dry and smooth, give it a coat ofwhite shellac varnish. This should be ratherthin, and may be diluted with alcohol ifdesired. All surplus varnish must be wipedoff the brush before applying it to the surface,for if too thick a coating is applied, it will not

was in this period of bitter commercial rivalry ,

that certain British radio interests first sawfit to attempt to discredit an American inven-tion and put forth the suggestion, altogetherat variance with the truth, that an Americanhad simply put another electrode in the two-electrode tube. There is no excuse, however,why, at this late day, such an untruth shouldpersist in American radio history, above all,when the whole world is making use of theAudion in radio communication as well as inlong distance wire telephony and the successorsof these same English commercial rivals arenow operating under the original De ForestAudion patent licenses. In fact, their entireradio system, outside of the generators andaerials, is built around the three -electrode -anode -voltage vacuum tube.

Very truly yours,

be clear enough to allow the stain to show. Thefirst coat of shellac will take about three hoursto dry, after which you should apply anotherone. Rub the dried surface with fine sand-paper until the wood is smooth. Don't rub ittoo hard or you will cut through the shellac.Varnishing comes next. Good brushes shouldbe used as cheap ones are generally coarse andshed their bristles. The varnish must not betoo cold as this prevents it from flowing freely.Have only enough varnish on the brush to give

a .level ` coating whenit is brushed acrossthe grain. Finish offby rubbing lightly,with the grain, lettingit dry thirty hours,or until thoroughlyhard.

Purchase some FFgrade pumice stone ata paint store; likewisea rubbing felt. Dipthe latter into linseedoil, then into pumice

stone which will now adhere to the felt. Rubthe varnished surface lightly along the grain.Continue this process until all small depressionshave disappeared. This may be ascertainedby looking diagonally over the surface when itis held to the light. All hollow places will nowshow as dark spots. The surplus pumicestone should be carefully removed with a softcloth.

Give it another coating, of varnish and letit dry, then repeat the operation with thepumice stone. The cabinet will have a dead,non -glossy finish. Those who prefer a shiningpolish can easily obtain it by dipping a pieceof felt into linseed oil and into powdered rottenstone (to be bought at a paint store) andgoing over the surface in the same manner aswith the pumice stone. A higher polish canbe obtained on the last coat by giving it therotten stone treatment, and then rubbing thehard varnish with a soft cloth dipped intolinseed oil, using plenty of "elbow -grease"until a high polish is obtained. The surplusshould be wiped off with a chamois skin. Theabove gives a durable finish; one that will notscar easily.. If all the work has been donecarefully, you will have a neat -looking cabinetthat will be envied by your friends who havenot learned polishing work, which is quiteeasy when you know how to do it.

This article fromRadio Broadcast, Jan-uary 1923 explains howwood was finished in1923.

The HORN SPEAKER 9820 Silver Meadow Drive, Dallas, Texas 75217 3

THE SRTURD,RY EVENING POST August 14, 1920

The UltonaPl.iy. All Record* B.eter

The Tone AaaplifierWith Grill Removed

In Many Styles and Finishes

nswick Methodp toduction

New Tone BettermentsDemandyour consideration

of The BrunswickTHE Brunswick Method

of Reproduction, al-though it has many advan-tages, primarily brings bettertone. All its features combinetoward that coveted achieve-ment.

Suppressed or muffled tonesare absent. There is a round-ness or fullness of expressionthat is quickly noted, the firsttime you hear The Brunswick.

The Ultona, the all -recordreproducer obtained only onThe Brunswick, obtains the ut-most from the record. It bringsout intonations often slighted.It plays each type_of record ex-actly as intended, being adjust-able at the turn of a hand.

Furthermore, it practicallyeliminates so-called "surfacenoises." It is the only counter-balanced reproducer. It trav-els a cushioned path aroundthe infinitesimal grooves ofthe record, its suspension soperfect that the needle followsevery undulation.

The Tone Amplifier, built toconform to acoustic laws, is an-

other feature of the BrunswickMethod of Reproduction.Here again tone waves, havingbeen reproduced perfectly, areallowed to amplify and developnaturally.

This Tone Amplifier is builtentirely of moulded wood, soshaped as to permit proper vi-bration of tone waves. There isno clashing caused by impris-oned tone waves.

In every particular and con-sidered as a unit, the Bruns-wick Method of Reproductionis one of the greatest advance-ments in the phonographic art.It brings final perfections, newrefinements.

Your ear will quickly detectthe superiority of The Bruns-wick. A comparison will awardThe Brunswick first choice.

So if you seek the utmost ina phonograph, be sure to hearThe Brunswick first. Visit aBrunswick Dealer. Ask alsoto hear Brunswick Records,which can be played on anyphonograph with steel or fibreneedles.

THE BRUNSWICK-BALKE-COLLENDER COMPA NYGeneral Offices: 623-633 S. Wabash Ave., Chicago

Branch Houses in Principal Cities of United States,Mexico and Canada

Canadian Distributors: Musical Merchandise Sales Co.,819 Yonge St., Toronto

4 - The HORN SPEAKER..... 9820 Siher Meadow Drive, Dallas, Texas 75217

CORRECT PLAYBACKOF SPOT RECORDINGS-Proper playback of spot recordings is equally if not moreimportant than the actual recording. Here are additional

facts which will interest the practical recordist.

RALPH L. POWERBBNBIIB11lllllllllllllllllllllllllllllllllllllllllllllllllllllllllBIllllllllllllllllll161IF

IMPORTANCE OF USING CORREC1NEEDLEIt might be well at this time to illustrate by

the accompanying sketches, the types of groovesnow in general sise in instantaneous recordingand call to the attention of the user that theselection of the proper needle has a very definitebearing upon hiss level and general performancein playback, likewise the life of the record.

Figure 2A shows a groove with a sharp or Vbottom, and a playback needle with a roundpoint having a radius at the point of approxi-mately 0.002 -in. Note that the point of theneedle bears above the bottom of the groove andactually rides on the side walls only. Figure 2Bshows a groove having a bottom curvature, cut bya stylus having a radius at the exact point of0.002 -in., being played -back by a sharp -pointedneedle.

A study of these illustrations reveals that useof the combination shown in Fig. 2A shouldmean reproduction without groove hiss; and amaterial extension of the life of the acetaterecord. On the other hand, it will appear to eventhe casual observer that the sharp -pointed needleshown in Fig. 2B will pick-up all of the hiss

RADIO -CRAFT forFig, 2. A, correct needle end groove combination;B, Incorrect combination; and C, Deterioration ofthe groove when the arrangement shown in B

is employed.

Club NewsTHE MID -AFRICA ANTIQUE RADIO CLUB

The following is some interestingnews from Bob T.ane.

"The Mid -American Antique RadioClub had a great meeting January 19,at the Chapel Woods Country Club. It

snowed 3 inches that morning but westill had 48 show up. Some came from50-75 miles away. Dale Goodwin flewin from Aurora, Colorado. We hadGrecen Enlow as guest speaker, hewas the last one to be the "Shadow"of that radio series. We had swap& sale of radios and talks on RadioPremiums of Orphan Annie and CaptainMidnight radio series. Our dues are11.00 a year and we are getting amembership card and list of all mem-bers addresses when joining. Wehave members from hundred of milesaway. Any who want to join can bysending their dollar to me. Nextmeeting is March 23. We meet every2 months.

Robert Lane,2301 Independence Ave.,Kansas City, Missouri 64124.

SOUTHWEST VINTAGE RADIOAND PHONOGRAPH SOCIETY

The members at the last meetingdecided to elect officers to servefor a certain length of time at thenext meeting, March 15, 1975. Pre-sently, they have only temporary of-ficers. !s one member said, "Any -

inevitably lying at the bottom of the groove.Further, accumulation of dust and foreign, par-ticles at the bottom of groove contribute to thegroove hiss so objectionable in most recordings.

A worthwhile suggestion would be that everyuser of acetate discs equip himself with amicroscope for examination of all record groovesand needle points, to make sure of properneedles in the playing of acetate discs.

If a record were played back as shown inFig. 2B, eventually the groove would be de-formed or roughened as illustrated in Fig. 2C,resulting in a decided increase in hiss level afterthe "rat playing, the roughened or fringed edgessetting up a hiss that would be very evident inthe speaker when the record was being played;and which would gradually increase with re-peated playbacks.

Of very great importance is the fact thatonly needles having the very finest polish shouldever be used on acetate. A rough point or pointsthat have become rusty will tear and roughenthe groove and side walls of an acetate record.

Needles that have once been played on astandard (or "commercial") shellac pressingshould never be used on an acetate record be-cause of the very simple fact that there is aslight abrasive in ordinary commercial recordsthat grinds the point of the needle to conformto the groove. The abrasive actually tears thesurface of the needle which if used to play anacetate will in turn tear and roughen the ace-tate groove. A needle in this condition actuallybecomes a cutting tool as will be readily per-ceived by examining its point under themicroscope.

SUMMARYMicroscopic examinations of hundreds of

acetate records have shown very conclusivelythat when not played on proper equipment hav-ing the features and details previously men-tioned, the results are an ironing -out orstraightening of the high frequencies-possibly"rubbed out" would be the proper term to use-as a result of being played back just once with

NOVEMBER, 1937.

one can now join and help us organ-ize or tell us how." The meetingwill be at Electronics Center, 2929N. Haskell, Dallas, Texas at 7 p.m.,

March 15, 1975,

Plans have been made for an ex-hibit of early microphones at themeeting.

LETTERSEDITOR'S NAQ.BAG

Sir:Please find enclosed my sub-

scription renewal. I think you aredoing a super job on your paper. I

wonder if anyone else is interestedin collecting wind generator andlight plant manuals, catalogs etc.Keep up the good work

K. A. Ladd

7525 Wentworth Ave.Richfield, Minn. K5L(23

Dear Mr. Crenshaw;I really enjoy The Horn Speaker

newspaper, my main interests aremost anything in the way of wire-less sending and receiving apparatusbefore about the year 1924, dittofor phonographs. About now I amattempting to build a very longwave radio receiver that will tuneway down to 13,000 cycles, the bot-tom end of radio. I have a faircollection of antique radio setsthat use type UV201, type UV201-A,UX201-A , type WD -11, WD -12, UV199,UX199 and VT -1 tubes. A few ofthem are home brew sets. Most of

a pickup having a stiff or highly -damped arma-ture; or excessive weight or pressure on theplayback needle ; etc.

While it is fully appreciated that there arevarious shapes of grooves in general use theyall, however, follow the same general order inthat they are V grooves. Some have roundedbottoms and some have sharp bottoms. Regard-less of the radius of the bottom of the grooveor whether sharp or rounded, a playback needlesuch as shown in Fig. 1 having a bullet orball -bearing point, gives by far the moat satis-factory results in playback and long life to boththe needle and record.

If acetate records are to become popular andcommercially advantageous, they must be givenmore consideration in the matter of playback.

Simplicity and sturdiness of construction beingvital in a part as constantly used and handled as aphono pickup, in the commercial design used asthe basis of this article the well -understood mag-netic principle was retained; the constructionwas highly refined ; and, the parts, especially thearmature, were made dwarf -like by comparisonwith the older types. As an example, thearmature is only 25/64 -in, in length from pivotto end; and, complete, weighs only 0.825 -gram.Adjustment is easily understood by every tech-nician and Service Man, and no delicate toolsare required; which simply means that anyirregularity may be easily and quickly correctedwithout sending the part to some distant pointfor service.

The pickup here illustrated (Fig. 1A) anddescribed is not intended to be used as a tech-nical device, but rather to fill the urgent needfor a practical pickup capable of everyday usein the playing of cellulose and all other typesof records. It will give faithful reproductionat full volume; and its negligible wear ex-tends the usable life of records many timesover. An instrument such as described, with areasonable amount of care should give satis-factory service over a long period of time.

This article has been prepared from data sup-plied by courtesy of Universal Microphone Co.

my collection still work, in factI still use a couple of antiqueradios most every day.

One in my house is a six tubeneutrodyne with three tuning dials,the other one in my workshop is athree circuit grid leak triode de-tector three stage audio ampli-fier and it sure is loud with typeUV201 tubes, I put type UX171-A inlast stage and I put 250 volts B -

battery and Lis volts grid bias bat-tery on it. All my radios made be-fore 1925, and use horn speakers.

LaVerne LaatzRR 1Marseilles, Ill. 61341

The Horn Speaker;

I

withmustthem

have an old Edison phonograph3 dozen wax cylinders that Isell because I cannot keepproperly anymore.

Mrs. Orlin C. Johnson832 N. Hibbard St.Staunton, Iii. 62088

SUBSCRIPTION RATES FORTHE HORN SPEAKER

Regular rate:One year .....$11.50Two years.........."`.CO

Special rates for one year(mailed in envelope)First class ..18.00Air mail C12.00Foreign air Ifail 116.00

$3.00 remittance for subscriptionafter October 31, 1974 pays for 7months. V4.50 as stated pays forthe yearly subscription.

The HORN SPE:AKE:R..... 9820 Silver

(i lie C /add LCby J. W. F. Puett

KINGS OF THE AIRWAYS

Radio madness reached its peakamong the affluent connoiseurs in thelast six years before World War II.The outstanding performance of E. H.Scott radio receivers was known theworld over and the era of custom in-stallations was flourishing.

It probably all started withseveral custom designed models of theAllwave Imperial. One example ex-ists today with a totally -different

custom console and special tuner withextended range to 80 MHz.

In 1935, the wife of a wealthycustomer commissioned E. H. Scott "tobuild for her, regardless of cost,the most perfect sound reproducinginstrument that could be designed."The result was the Scott Quaranta.This ¿40 -tube model was offered inthe December 1935 Scott News at1.2,500.00 - "completely installed inyour home by engineers from the Lab-oratory."

The Quaranta was housed in twolarge consoles. The first consolecontained the automatic record changerand tuner chassis. The tuner chassiswas almost identical to the tunerused in the Allwave Imperial. Thefour speakers and 20 -tube amplifierwere housed in the second consolewhich was very ornate with detailedwood carvings. The combined weightof both consoles was 616 pounds.

Two channels were utilized inthe Quaranta audio system. Eachchannel was rated at 50 watts (RMS)for a total channel -to -channel out-put of 100 watts. The mid -range andhigh frequency amplifier utilizedeight tubes and "handled frequenciesfrom 125 to 16,000 Hz." the bass am-plifier utilized twelve tubes and"handled frequencies from 30 to 1.25Hz."

The speaker system consisted ofa "mid frequency" speaker located a-bove the low frequency speaker, "sothat the fundamental frequencies ofspeech and music were reproduced atnormal height above the floor, andjust above ear level when sittingdown." Two high frequency speakerswere located at the top of the cab-inet with their sound being directedthrough exponential horns and difus-ing vanes. A volume expander was in-corporated in the Quaranta to "addvivid realism to music and voice."

At least two Scott Quaranta mod-els were built. A duplicate modelwas built by E. H. Scott --"for myown personal use."

With the introduction of theScott Philharmonic in 1937, custominstallations boomed. In an increas-ing number of modern homes of thatperiod, much of the furniture wasbuilt into the rooms. Scott receiverswere incorporated in many applicat-ions with the built in look. In many

Meadow Drive.Dailaa. Texas 753117

of these custom installations, the re-ceiver dial and control knobs wereconcealed behind built in doors inlibrary and drawing room walls andeven under the stair steps in one in-stallation which I have seen.

Many owners had special customcabinets built which matched theirexisting furnishings. These cab-inets varied from ornate formal con-soles to relatively simple secretarydesks. I have seen an Allwave Imper-ial installed in a special home madedesk with glass panels through whichthe chrome -plated chassies could beseen.

Remote control systems were alsoavailable, providing a choice oftwelve different stations or switch-ing from radio to phonograph records.One such system was even installed ina plush yacht with remote control andspeakers in the master bed room, andon the sun and lower decks.

Remote speakers with special or-namental grills were used extensivelyin custom installations. Some moreelaborate systems featured remotespeakers in every room of the house.

Many of these kings of the air-ways are gone now. Many were built

.5

in; they had no cabinets or consoles.They were "junked" in the remodelingof the fine old homes in which theywere once a vital part of the splendor.

Custom built Scott Philharmonic in custom installation, late thirties

6 The HORN SPEAKER.,... 9820 Silver Meadow Drive, Dallas, Texas 75217

12 TUBE ALL -WAVE SUPER.

(No. 536)

ONE manufacturer is concentrat-ing his entire sales energy on

a new 12 tube all -wave superhet-erodyne. A 4 position switch controlsthe range of 11 to 570 meters. Thisset incorporates a noise and sen-sitivity control, electron -coupledbeat -frequency oscillator, A.V.C.,phonograph connections, meter tun-ing, manual band spreading, Wun-derlich second -detector, and provi-sion for headphone connection.Utilizes 6 type 68 tubas, one 2A7,one Wunderitch, 2 2156. and 2 6Z3a.

The undistorted output of thepush-pull power amplifier ís 12 W.The antenna -to -speaker fidelity israted at 30 to 4.000 cycles, uniformto 10 db. The selectivity immediatelyadjacent to high -power locals is 9ke. The sensitivity is 14 -microvoltabsolute_

This receiver is composed of 2chassis. The tuner measures 19j/jx12:914 ins, high. The power supplymeasures 19%x7x* ins- high. Anyunit used in the construction ofthis set that becomes defectivewithin 2 years will be replaced freeof charge either for parts, materialor labor.

1939 ad

A REAL HOWARDCommunication

Receiver*COVERS BROADCASTWAVELENGTHS DOWN

TO 7 METERS

Model430

BUILT with

ItaditionalHOWARD

QUALITY4 Bands -6 TubesBuilt-in SpeakerComplete ready foplug-in A.C. Outlet

HERE is a radio set that will thrill everylover of distant and short wave reception.An ultra -sensitive receiver with electric

bandspread to separate stations. You can listento everything on the air from .54 MC to 45 MC(7 meters to 553 meters), foreign, domestic,amateur and commercial, broadcasts and codeModel 430 is now used by thousands of am-ateur stations, aeroplanes, ships, forest pa-trols, police, armies and navies the world over.'For 012 50 additional the new model 610 DCpacer supply now makes the 430 communication re-ceiver available for use in your home on 110 voltsAC and you can use it on six -volt storage batteryoperation for portable and emergency use: on yourSummer vacation: camping, Marine or pleasure boatuse. The model 430 also makes a dandy mobile re-ceiver for the popular 10 meter hand, for auto andtrailer installation.Here's the greatest value In the communlcat inn fieldfor only 029.95: A hand -built Howard with thecustom parts, fine engineering and spectacular Per-formance; features of communication receivers sellingfor twice the price or more. Cheek these outstandingfeatures: 4 Bands-broadcast to 7 meters inclusive.Ceramic Coils, Iron Core Hi. Q. I.F. Transformers.Electrical Band Spread. Excellent Ultra -High Fre-quency, and eleven additional communication features.

Pacific Coast and Export Prices Slightly HigherAmerica's Oldest Radio Manufacturer

freeSend Coupon for Technical Dataand Name of Nearest Parts Jobber

HOWARD RADIO COMPANY1731-35 W. Belmont Ave., Chicago, III. tirase send me data on Models 430. 430 end

430AO I desire demonstration of Model 430.

Name

Address

t'1ty StateRC -519

19314

Sight and sound television set. (1743)

1939

SIGHT AND SOUND TELEVISIONSET (1743)

(Andrea Radio Corp.)SIXTEEN TUBES are used in this

newly -marketed "duolateral" super-heterodyne which employs 2 intermedi-ate frequencies, one for video and onefor audio. Illustrated is the table model1-F-5 which uses the special 5 -in, short-neck cathode-ray tube, making possiblea depth of cabinet not much greaterthan a standard, table -type broadcastset.

The standard set model covers 2 sightand sound channels, 44 to 50 and 50 to56 megacycles, although other fre-quencies can be used by merely chang-ing the tuning unit. This model fea-tures "sharp focus" image reception,and "picture tone" sound (which isclaimed to be distinctly different fromthe tone of broadcast reception).

121 CLASSIC GOLDEN AGE RADIO

HOWARD EXPLORER MODEL W DELUXE 19 TUBE ALL -WAVE SUPER.(Uses single -purpose tubes to secure extreme circuit stability; wavelength range, 13.6 to 2.142 meters; provides for either invertedI er doublet antenna; neon mutants

Indicator; zero -beat oscillator; variable Q A.V.C.; tone control; variable A.V.C. parallel push-pull output 2455.)

A 19 tube radio receiver in its home. Airplane -typedials are used; only the tuning dial sector of the bandin use is illuminated, as the band switch Is turned.

111111111 III11111111I111111I1111111II I I III IIIIIIIIIIIIIIIIIIII

Schematic circuit of the A.F. amplifier and powerpack chassis. There are 9 tubes in this section of the

instrument. A "theatre" -type dynamicspeaker Is used,

VOLTAGES ARE SHOWNIN P,:RENTHESES.

Until very recently the general practice hasbeen to utilize the new tubes at their maximumcapabilities. Consequently, a slight change incharacteristics would greatly affect the opera-tion of the complete receiver. However, this19 tube set is designed to utilize its tubecomplement very conservatively, with the resultthat great stability has been achieved which,after all, is a major factor in securing satis-factory reception, especially on the shortwaves.

Note: it is inadvisable to attempt to realignthe set except as a last resort. The recom-mended procedure, only to be used by expertradio Service Men, is as follows:

To align the I.F. circuits feed the I.F.service oscillator test signal into the control -grid of V2.

When aligning R.F., I.F., or oscillator cir-cuits turn A.V.C. adjustment (slotted shaft)to extreme left. The I.F. trimmers are verycritical, greatly affect the performance of theset, and must be carefully resonated.

Aligning R.F. end Oscillator Circuits

Adjust A.V.C. control to extreme left posi-tion. It is unnecessary to remove the set oscil-lator tube. Align the circuits only in thesequence given.

To align the set oscillator turn its trimmerall the way out and then select the strongestsignal when turning it in ; set insensitivitynear the center of the dial will result if thewrong oscillator signal is used.

Bend the variable condenser plates for kc.dial alignment only in the broadcast band.Before adjusting any band, make certain thatthe pointer of the station indicator is set onthe last black line when the dial is turnedall the way to the left on the broadcast bandjust above .55 (Maximum capacity of thevariable condenser).

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Lorg-Wave BandTurn the band indicator to .15-.35, set the

dial to .35, and feed 350 kc. into the antennapost. Resonate the trimmer (not green codedon the trimmer washer) in the long -waveoscillator can. Align the R.F. and antennastages. Reset dial to just above .17 and res-onate the green coded oscillator trimmer at175 kc. Recheck the 350 kc. setting.

Broadcast Band

It is necessary on the broadcast band only,that a metal plate with holes in line with thetrimmer nuts be used so that the circuits arenot detuned when the regular base plate isscrewed back on.

Turn the band indicator to broadcast .55 to1.5, set the dial to 1.4, and feed in 1.400 kc.Resonate trimmer 14, R.F. trimmer 7 and theantenna trimmer (knurled knob extendingfrom top of antenna coil can). Now rotate dialto .55 and resonate trimmer 10 at 550 kc. Re-check the setting at 1,400 and bend plates ofvariable condenser at 950 and other pointswhere necessary to secure ke. reading on dial.

Short -Wave Band No. ITurn band indicator to 1.5 to 3.5, set dial

to 3.5, and feed in 3,500 kc. service oscillatorsignal. Resonate trdmmer 13, R.F. trimmer 6and antenna trimmer 3. Rotate dial to .55on broadcast band. (The short-wave dialcalibration may be inaccurate at this pointand the .55 figure corresponda to 1.5 on short-wave band No. 1.1 Feed in 1,500 kc. andresonate trimmer 9. Recheck at 3,500 kc.

Short -Wave Band No. 2Turn band indicator to 3.5 to 9, set dial

to about 8.9 (due to off -calibration this cor-responds to 8.5), and feed in 8,500 kc. Res-onate trimmer 12, R.F. trimmer 5 and an -

ALL VOLTAGE RE;sOINGS TAKEN PROM VAR'OUS POINTS TO GROUNDWITH 1,000 OHMS -PER -VOLT METER AND WITH _INE VOLTAGE AT 115 V. A.C.

PUSH-PULLA.F. 1

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for SEPTEMBER, 1934 Continued page 9RADIO -CRAFT

The HORN SPEAKER 9820 Silver Meadow Drive, )lamas, Texas 75317

McMurdo SilverEarly biography of the "youth" behind theSilver -Marshall and McMurdo Silver radios

By A. Henry

HAVE you ever sat in one of the sky -scraping stadiums which now dotthe land and watched a famousfootball team in action-and then,

later in the game, had an opportunity tostand close by the side -lines and see thatteam rush past you, literally shaking theground as It bucked the line of its adver-saries with speed "faster than the eye canfollow?" That is, perhaps, a feeble sug-gestion of the impression one gets frommeeting the newest and youngest amongthose radio manufacturers who hold thecoveted "RCA license." He is one of themost remarkable figures in an industry dis-tinguished for the number of young menwho have attained high places.

Yet, lest the impression be conveyed thatMcMurdo Silver is a superman sent to earthwith some peculiar sort of silver spoon inhis mouth which causes difficulties to vanishbefore his inspired onslaught, it had best beexplained that such by no means appears tobe the case. Those familiar with Silver'sshort but adventurous business life knowthat, if he is a whole football team in him-self, his life has been no continual successionof marches down the field to repeated touch-downs. On the contrary, there have beentimes when the ball was in the enemy'shands, with the line gritting its teeth towithstand the opponents' determined rushes.But, after all, the important thing abouta football game is the final score. And thereis no better way of stating his score thanto say that in 1924 Silver went into theradio parts business with a determinationto attain leadership in that business withinfive years; and that the thing was done infour years instead of five-for 1928 sawSilver -Marshall at the top of the heap!

And-if further evidence is needed -1929finds this same 26 -year old executive the re-cipient of a manufacturer's license from theRadio Corporation of America, GeneralElectric Company, Westinghouse Electric& Manufacturing Company, and American

AutomotiveRadio

RADIO -CRAFT

May, 1932

Telephone & Telegraph Company, to manu-facture radio receivers under the famous"pooled patents" which opened the door tolarge-scale radio production in the marketof the middle twenties. When it is re-membered that these licenses have consist-ently been issued only to large and long-established radio manufacturing corpora-tions-and that a minimum payment of$100,000 per year is required of each licenseeas compensation for the use of these com-bined patents of the largest electrical re-search laboratories in America-it becomesclear. that those in the high councils of elec-trical big business are much of the deliberateopinion that McMurdo Silver is a "goodbet."

And the story of this man who is still amere boy, is doubly interesting; for it caneasily be the story of any "amateur" youngman of today, if only he is willing to followin Silver's footsteps, and work and study tofit himself-not to seize, but to do as Silverdid-to make, his own opportunities.

McMurdo Silver was born on the 15th ofMarch, 1903, in Geneva, New York-almosta St. Patrick's baby. His father was pro-fessor of ancient history at Hobart College.Both of his parents were of American stockfor several centuries back, with Scotch, Eng-lish and French blood behind their Americanancestry. The boy's early youth was un-eventful except, as this narrative may fallin the class of "success stories," it must bestated that young Silver did not run true to"success" form. He was not a leader amongthe boys of the town, he did not play themost devilish of practical jokes, and he wasnot at the head of his class-actually, he was'far from the top, most of the time. Norwas he a book-worm-in fact, up to the ageof nine, nothing unusual seems to have beenapparent in the boy except a rather notice-able seriousness.

A8 THE TWIG IS BENTAt the age of nine, "wireless" came into

Silver's life. How it came, and how he as-similated it, forms anamusing anecdote.Some older membersof his family, seekingto instill educationalthoughts in the child'smind, one day readto him two accountsfrom a monthly mag-azine. One was of"wireless," which hadcome into the lime-

A young constructor, afew years back, busy witha set which its contempo-raries can readily date. Hehas since proven up withthe industry - in fact,from a business stand-

point, much faster.

McMURDO SILVER

light of public attention through the sinkingof the Republic and, just then, of the Ti-tanic. At the same time an account wasalso read of the Mexican Rurales, a troopof mounted police recruited from criminalsby the simple and masterly expedient ofcatching one, putting a rope around his neck,placing him upon a horse all ready to begently stroked with a whip, and asking theindividual so situated if he wished to be-come a Rurale, or if he preferred to dis-mount from his steed posthaste and remainin the unenviable position of hanging'by hisneck to an obliging tree limb, separatedfrom it by several feet of rope, and from theground by several feet more. The answer,unless choked off by the culprit's emotion,or the executioner's desire for the unusualnegative reply by way of a bit of extra ex-citement, was invariably "yes."

Strange as it may seem, these two bits ofinstruction stuck firmly in the young man'smind. The next day the cook, called to theback yard of the family residence by un-earthly yells, beheld a strange sight. Sittingastride a saw -horse was a young Mexicanboy hurriedly conscripted for the part of theconvict. His hands were tightly tied, and avery heavy rope, almost thicker than hispudgy arms, connected his unwilling neckwith the limb of a small tree directly abovehim. He was calling loudly upon -all thesaints known to him in a somewhat unin-telligible imitation of Spanish. Next to himstood one of the "Silver Gang," asking loudlyand repeatedly whether he "joined or cited."The executioner, in anticipation of the reply,held the nozzle of a length of garden hosein his hand. Some distance away, in a con-fiscated wash -boiler, stood the instigator ofthis new game, holding the other end, of thehose in one hand, while in the other wasanother piece of hose which reached back tothe gibbet and terminated in the grimy gripof the assistant executioner. As the victim'spleas were uttered, the executioner shoutedthem into one hose, through which they werepresumably transmitted to the ship at sea,represented by the wash -boiler. From th, .c,through the other hose, the verdict wasshouted in a high falsetto to the assistantexecutioner, who in turn put the all-impor-tant question to the prisoner.

In this way wisdom was assimilated by

the analytical mind of McMurdo; communi- 7cation with ships could only be through rub-ber hose, since . one couldn't shout severalthousand miles. And to use "wireless teleg-raphy" one had to have a reason; which wasopportunely provided by the recalcitrantson of a Mexican villager, who might evenyet be reclaimed to the cause of the law bystrong -rope methods and the marvels ofradio.

THE TREE'S INCLINED

Having had the error of his ways physi-cally impressed on him in no uncertain man-ner, the inquiring streak of Silver's mindcame to the surface. He set out to findout about "wireless," and the reason for hischastisement. This he did for several yearswith no overpowering success. To earnmoney to buy the parts with which to ex-periment, he obtained a job that every olderboy in town had had before him, and givenup after a few days-or few weeks-for thejob required a degree of regularity abhor-rent to a small boy's soul. It was thenewspaper route in the village. Every day,including Sunday, the boy had to get theNew York City papers from the noon train,make up his route, and deliver papers fromone end of town to the other, rain or shine.Fort'unately, Silver's school hours permittedthis and somehow fie held the job not for amonth, but for years. And so the paperroute that had once been a source of emer-gency revenue to small boys of the town,ceased to be a source of annoyance to themethodical villagers who wanted their paperspromptly on the dot, and seldom had gotthem. But let us not give young Silvercredit for too much perseverance. Two fac-tors held him on the job, rain or shine, win-ter or summer. The first was a parentanxious for his daily paper to arrive prompt-ly and regularly, and the second was asimilar determination on the part of the no -longer harassed proprietor of the route,which manifested itself in a much more sub-stantial manner than parental orders.

All the money gained does not seem tohave given him a "wireless" that was everthe talk of the town, but the foundation wasbeing laid; he was reading and studying"wireless" to a point where his schoolstudies suffered badly. Early in 1916 Pro-fessor Silver died, and the young man movedto New York City with his mother. Bythis time he had managed to squeeze out ofgrammar school, from which he never didgraduate, and into high school; and forthree successive years he was the discour-agement of his Instructors, all of whomfinally gave him up as hopeless, and firmlythrew him out of school.

So on a memorable Armistice Day ofNovember 11, 1918, while Wall Street wascovered from top and bottom with paperand ticker tape, and the world was terriblyjubilant at the prospect of peace after thelong repression of the war years, young Sil-ver started to work in earnest to help sup-port his family. And had Professor Silverbeen alive, it is doubtful if he would havebeen greatly grieved at the failure of hisson to acquire an academic education; forthe liberal -minded father had always feltfrom his years of experience that for ayoung man so uninterested in a college train-ing as not to desire it, or to be unable,through lack of interest, to assimilate it, itsloss was no real loss.

But this time the secret of Silver's suc-cess could be seen, but by most parents it

Continued on page 8

DISTRIBUTOR AND CONDENSERSPARK PLUG CONNECTED

SUPPRESSORS TO AMMETER

BATTERY SIDEOF STARTING SWITCH ANTENNA PLATE "B' BATTERY

BOX

D

7

At the left is shown a typical car installation and at the right is shorn a typical car antenna. .At .4 arc shownstagger tacks to hermit listings on headlining, to be tacked over screen; at B, dome -light; at C, dome -light tiring; at D, a hole whichis cut to clear the dome-light-the edges of the screen are

soldered; at E, the antenna screen-use bright copper or bronze wire only; at F, edges of screen-they must be soldered.

The HORN SPEAKER 9820 Sther Meadow Drive, Dallas, Texts 75217SILVER

would not have been recognized. He wasa failure at school; yet at the age of thir-teen, in 1916, he had written, and had suc-ceeded in having published in a sportingmagazine of the day, an article of severalthousand words on a subject in which hewas deeply interested-early American fire-arms. This was during wartime, and as"wireless" had been prohibited to amateurs,Silver had thrown his whole interest intostudying his other hobby, antique guns. Hisinterest was so great, and he had spent hiswaking hours in such deep study and de-termined efforts to satisfy his curiosity atpublic libraries, museums, and in gun stores,that he possessed at the age of thirteen amore complete knowledge of early Americanarms than many a veteran collector or'dealer. And this knowledge had enabledhim to earn many hundreds of dollars in theyears of 1916, 1917 and 1918 in buying, sell-ing and trading old arms; for in this fieldhis commercial talent first showed itself.

Interested as he was in firearms, he couldnot enlist, for he was but fifteen years oldwhen the war ended. The ban was liftedfrom radio shortly after Armistice Day, andSilver began to experiment again, with thenew vacuum tubes that had been developedduring the war. Not content to work as aWall Street messenger during the day andplay with wireless at night as most boyswould have been, he added the commercialelement of building, buying and selling thecrude "wireless' parts and sets of the dayin addition to his trading in old arms. Silverwas ambitious, and spent in study his everywaking hour outside of a job that he seldomleft before seven or eight o'clock in theevening.

WORKING INTO RADIO

The story is told that he gave himself fiveyears to become a partner in the old,established brokerage house for which heworked and, upon finding himself advanced

only to the position of quotation -board boyafter a, year and a half, forsook Wall Street.At this point his life work was determinedupon. Up to then "wireless" and antiquearms had, had his almost equal interest. Theoffer of a position as laboratory assistantin the tube laboratories of the WestinghouseLamp Company at Bloomfield, New Jersey,decided his fate and radio definitely claimedhim early in 1920. The work of developingthe tubes that preceded the present Radio-.trons so intrigued Silver that he decided tobecome an engineer-this lad who had failedat every scholastic study. How did the boywho had been disappointed because he couldnot rise to the top over night in WallStreet go about it?

His interest aroused, he set to work,blindly at first, then pointedly. First heasked-"Why can't I have an engineer's jobnow?" And when laughed at he persisteduntil he found out concretely just what hewould have to do to become an engineer.Having then little money for education, hedecided to take night courses in engineeringat Cooper Union. But he was unable topass the entrance examinations; for his onlyeducation was what he had absorbed fromhis parents and dug out of his hobbies forhimself. Unable to take up an engineeringcourse at once, he set out to lay the ground-work that would enable him to enter CooperUnion later. Starting in another nightschool to prepare, he soon passed his ex-aminations at the head of one class, secondin another. Such was the strength of hisinterest when once aroused. In the mean-time, having learned all he could at theWestinghouse Laboratories without knowl-edge of his own, he went to work for aradio and electrical jobber in New York tobroaden his experience. Not greatly inter-ested in his work, he made no startling suc-cess, though promoted twice in eighteenmonths, once to head of his department, thesecond time to a higher department.

Continued next month

A modest start for a manufacturing industry: the second floor of a garage in aChicago suburb was the first home of "S -M."

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1932 COMMENT ONA FOREIGN RADIO

Pictured below is á new receiver manu-factured by Telefunken, of Germany.Now, this receiver has many good pointswhich may well be incorporated in Amer-ican sets.

First, the under -chassis view, shown tothe right of the set, is so constructed asto make servicing a relatively easy mat-ter. This, of course, is in direct contra-diction to American standards.

Telefunken receiver.

Anotaer feature is the fact that thebleeder resistor is made in one long stripconsisting of individual components me-chanically held together. In the eventthat one part of the strip goes-it doesnot become necessary to replace the entireunit. And, each and every part of thestrip has its value marked on it, so toavoid useless looking through "partslists" in order to find the value of thedefective unit. Parts lists are providedfor replacement work, of course.

RADIO -CRAFT for NOVEMBER,

Under -chassis view of the receiver.

1932

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50 YEAR OLD FLAME PROOF KEY

TYPE J -7-AGov't Orrii.r No. 141082 Dat,td: 1921

JAm;129.15.In 1966 the U.S. Navy closed the hughBrooklyn Navy Yard and the City of New Yorkpurchased the property. The J7A Keys werediscovered in a warehouse where they had beenstored for the past 50 years. Corrosion has beencorrected, however, there is some slight paintpeel. New boxes have been piovided.

Both keys are of heavy duty construction witha large Navy type knob. The keying arm anddome are brass ... the contacts are V. inch coinsilver. The J7A is 2'/, x 5%, inches and the J5Ais 2Y x 34 inches in size. The BULB, or Lampis NOT supplied with the J7A.

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The HORN SPEAKER 9820 Silver Meadow Drive, Dallas, Texas 75217 9TWIN -DETECTOR MIDGET

SUPERHETAVARIATION in radio set design is

shown by the mantel -type superhetero-dyne receiver ilbt,:'1 ,red in Fig. A; the dia-gram of connections (Fig. 1) illustratesseveral novel variations from orthodox de-sign.

The input circuit includes a band selectorof the inductive -coupling type. Although

Fig. AThe Radiette "Model 90" midget super.

the use of type '24 tubes is shown, the vol-ume -control potentiometer, R1, is in thecathode circuit and, consequently, the circuitis readily adaptable to the use of type '35variable -mu tubes; with corresponding re-duction in the amount of cross -modulation.A "local -distance" switch, in the chassis, isthe only other means of control. The tonecontrol is of capacity -resistance type; Cl -R2, connected from grid to grid of the push-pull '45's. The field coil of the dynamicreproducer obtains its current by being con-nected in the negative lead of the powerpack. A jack is provided, for connectionof a phonograph pickup in the cathode cir-cuit of the twin -detectors.

This novel arrangement of a power de-tector circuit is the outstanding point ofinterest about the "Model 90." This twin -detector design, it will be noticed, is obtainedby paralleling two type '27 tubes.

For the guidance of Service Men, the fol-lowing data are furnished concerning thetube (average) operating characteristics:Plate potentials: V1, V2, V4, V5, V6, V7,V8, 225 volts; V3, 85 volts. Cathode poten-tials: VI, V4, 2 volts; V2, 7 volts; V3, 5volts; V5, V6, 25 volts; V7, V8, 28 volts.Screen -grid potentials: V1, 'V2, V4, 85 volts.Voltages corresponding to the colored leadof the reproducer are as follows: red, 230volts; blue, 160; black, 0.0; brown, 225. Allpotentials are thus indicated only on a high -resistance meter.

There are two 8 mf. sections of an elec-trolytic condenser, C2, in this chassis. This,the "Radiette Model 90" receiver, is a prod-uct of Keller -Fuller Mfg. Co., Ltd., LosAngeles, Calif.

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c '24 175K

2 GO .O02MF. -DETECTORS

'275 RFC.

60H

5,000 OHMS

RE 500,000 044545TONE CONTROL

0.5MEG 25,0000HM5TO

VOICECOIL

T2IIN

50OHMS

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5000 0w151. MEG. .. '

MELD

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120V

Fig. 1

Idemticail filament, grid and plate current and potential readings on two tubes in the detector position might come as a surprise to many Service Men;hull the schematic circuit of the Radiette "Model 90" receiver, above, incorporates such a twin -detector connection; each pair of the elements being

connected in parallel.RADIO -CRAFT for SEPTEMBER, 1931

CLASSIC GOLDEN AGE RADIO, continued from page 6 122

HOWARD EXPLORER MODEL W 19 TUBE ALL -WAVE SUPER. (Concluded)

tenna trimmer 2. Rotate dial to 3.5 and res-onate trimmer 8 at 8,500 kc. Recheck at 8.5(8.9).

Short -Wave Band No. 3

Turn band indicator to 9 to 21, set dial to20, and feed in 20,000 kc. Resonate oscillatortrimmer 11, R.F. trimmer 4 and antenna trim-mer I. The alignment at 9 is obtained by useof the fixed condensers which should not re-quire change. To insure band sensitivity inthe region of major foreign program reception.turn the dial to 12 and resonate antenna coiltrimmer 1 at 12,000 kc.

Note that since all adjustments are madewith the A.V.C. inactive, extreme care mustbe used to attenuate the input signal lowenough so that there will be no overloading oftube amplifiers while making adjustments.

After these high -frequency adjustments havebeen made, the service oscillator setting shouldbe advanced 930 kc. and the output signalstrength considerably increased; non -receptionof the image signal indicates incorrect setoscillator adjustment. For example: a serviceoscillator signal of 20,930 Ice. should be per-ceptible at 20 on the dial after alignment to20,000 kc.

Beat Oscillator Adjustments

Turn the main dial to receive a service oscil-lator signal of 4,800 kc., and make sure thatthe band on the "beat oscillator" (FrequencyMeter V17) falls on 1.5 when the 2 gang con-denser is at full capacity.

Turn Osc. Sw. to the right ("Mod."), andfrequency dial to 4. Resonate the trimmer onthe 2 gang condenser to main dial setting.Turn band indicator switch to short-waveband No. 1 (1.5 to 3.5 ), set main dial towhere 1.500 kc. comes in, turn frequency dialto 1.5, and then resonate trimmer 15.

Q VOLTAGES ARE SHOWNW PARENTHESES

IF)-

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nl-MF

Miod-MF.

G

!I F.

\ t 253)

4e

Y V

0.

A.V.C. Adjustment

Connect one side of a high -resistance volt-meter to A.V.C. potentiometer terminal whichconnects to the "high" side of the 0.2-meg. re-sistor and to the 0.1-mf. fixed condenser, andthe other (positive) to chassis ground.

Adjust the receiver for reception of a signalintensity of 3,000 to 4,000 micro -volts, andvary for maximum voltmeter reading, in agiven locality, the adjustment in the top, nextto the neon adjustment, of the coil can assemblyin the upper right-hand corner (facing rearof tuner).

In certain localities close to a broadcaststation it may be necessary to readjust theA.V.C. (Blotted shaft) control. Exactly res-

onate the receiver. Then, if the station's sig-nals sound "fringy" or rough, turn the controlto the right only sufficiently far to correct thiscondition.

Neon Tuning Indicator and Q.A.V.C.

Facing the back of the tuner chassis, ex-tending through one of the tall shielded as-semblies in the upper right-hand corner, willbe found a small, black knurled knob used toadjust the neon resonance indicator. It isadvantageous to be able to set this adjustmentif excessive fading is experienced due tolocality. Adjust the receiver dial to a powerfulstation during the time of day in which it isreceived strongest. Then turn the neon adjust-ment until the light just fills the opening inarrow dial. Readjust the tuning dial of thereceiver; should the light become more bril-liant, leave the dial at the point of highestbrilliancy and again readjust the neon indicatoruntil it just fills the arrow opening. (This ad-justment need be made only when the set isinstalled.)

Since the inter -station noise suppression sys-tem or Q.A.V.C. is a proportional function

ALL VOLTAGE MEASURSMPNTS FAUNTO OHO. LINE VOLTAGE - 115 V SET

TIMED OFF-STATNYII. F.2

151 1255)

40012 ONMS

of the neon light, the Q.A.V.C. system willbe correctly adjusted.

Note that the neon light system is not in-tended to work on the short-wave stations.However, it will usually indicate resonance tomore powerful signals.

Resistor X is an oscillator suppressor inshort-wave band No. 3. Its value is determinedby individual requirements.

Locations of trimmer condensers in the new 19 tubeall -wave superheterodyne. This illustration furnishes

the necessary information to completethe data in the text.

Iilll I II I III I I I I I II I I I IIIIIill11111111IIIII IIII I I I II IIIIIIBII

Schematic circuit of the tuner ehassls. There are 10tubes in this unit. The 2 -gang condenser mentionedIn the text Is located at the right of oscillator V17.

` 2vs

V v

zz (110)

l- i MEG.

ow.

i AV.

WMI00,S

ti30,000 0NM5.1 4000 DMMS

Rs.0

0.1-HoCi

25

al -ME

DMA'S

0.S

OS

0.1-MEG.1 MaG,

111~1.0.1.

F T55

-4R.FC

ti

(2)500 0H0.43-.

I2)

MF

Moo

VS

Y Y .25-MF.

OHMSBIKT-bat

257,

l

VF,

J

55.

0.2-MEG.

.1c

5-W

1W. r

Sw.

1i

5-w

r DDO^-i.ao0

0.145vl

V Y

MM.

TNEONL -w SUAl

,NOICA11511

SW 35

Be

MEG

J

MEG

l

57 RAMP A.V.0 -

i140)O1 5)

(100)

PI- LOT

(100)LGNT

v Y a.sv.

5°00005

)

I (20,000OHMS,

\5, ,i

'+^'...I'' (340)

CLOSEO RGRIENLw oh( sw3BAND

Zug

0.1. ME (!AM)

r

ttOSEoNsw3

e5No

LIP . I

ti

J ewfl

)

Sw. 3CC- i

eá 5 -W tI WITH SWITCH ON

SWITCNES 3A,aAHOCAalGANGED I.C465KC.

(50`57 V1

AMP

(a)

ÓHa150 VI

1100)

GND

Bi 100 V.

6+'250V

Y

V2

V

q,000OHMS)

-MAYRA.VC

PIOpsAoq

c -j pp 5-MEG

COi,T ÓL

MEG

R Co,,,

1

( I

' 1 I

GAHOE_ J' sw.1-1 iCLOSED OH Sw.3 eSND

FltINPUT TO

POWERAMP -

165 Gardenia Avesta.,ROYAL OAK, MICHIGAN

164 RADIO -CRAFT for SEPTEMBER, 1934

10 The HORN SPEAKER..... 9820 Silver Meadow Drive, Dallas, Texas 75217

DURINGSPARE

MOMENTSWhen not de-veloping receiv-ing outfits, W.F. Diehl, ChiefEngineer of A.H. Grebe cCompany, seeksenjoyment atBayside, N. Y.His voice hasbeen heard overthe radiophonein nearly everystate in the

Union

1922

1975 advertisement

1923

t.ftfRlE. 4131Ao'.L';tM

'

r CiqF,

r.RED R3DID 40LIFIER

iSD r1 5141)..

SERI4L RQ, lit

A SINGLE STAGE OF TUNED RADIO -FREQUENCY AMPLIFICATIONis provided in this amplifier, which may be applied to any form of receiver without making special connections.Four output coils, giving a wavelength range of from ) 50-300o meters, form the coupling between the radio -

frequency amplifier and the receiver proper. The price of this unit and the coils is $60.

Q 1PORTE nal+eass 1 rsT. natmsa mart IIlnnOlIts RIM aIJCTINSIICe NETT na:Tons mew nasa:a rtwzr r.afT:nsmua 1 ram mammal 1 ra.r RMi7aalta 1 rsrT suction= 1lc=

TUBES ARE T TESTED on a mutual conductance tubeIN _AND 4 THE n THAT A TUBE IS AVAILABLE

a t ker before R SATISFACTION - IfCA119IODICATES

IIIDICIT® THAT TNH TUBE IS AVAILABLE USED.SYMBOLNBM AND TUI ST BOLI

PU E TT ELECTRONICS you are not satisfied with your order for any reason, tubes myu

be returned within ten days for refund or replacement with ex-ception of tubes which are shorted or have open filaments. It prides listed for new tubes

I LIST NUMBER 10will be assumed that returned tubes with openfilaments or shortsassumedwere

4TAB" MORE RECUT TUBE TYPES - need tubes are half new price

IAILG ADDRESS:II3008 Abate. Drive Mesquite, Teas 75149

damaged in shipment. Shipping damage laim will be handledpromptly through the post office on toured orders. Puett Elect-

liability for insured,042 n 6116 m 1215 m 3. 3515 nu

'3.2. 1629 u 3.

1011 TO ORDER:

notroutes aesmes no orders which are n endno liability beyond that which is covered by postal insurance.

043 u013 u

2..

6ÁD6 m6196 nif

6816

-....

1216 m12116 m

3.+...

3526 nu4025 u 3.,1634

1633 uu

(1) E,,,yy.: p: . I + MIST BE MGQU22003 mOD3 m

.

.m

68E6 m -. 12117 e12106 m . 4523 n

4525 m3.3.

1635 u2050 m

2.

3.1 :l i: { JIM-rr.

(2) Please state whether new or need tubes are

IN TABLE 3, THE SYMBOL n INDICATES THAT A TUBE IS AVAILABLEREM AND THE SYMBOL u INDICATES THAT THE TUBE IS AVAILABLE USED.

OT4 n024 m

nr3.3:

61.16 m604 m676 m

-.'.. 1207 nu

121/6 m12816 m

'.'.

5095 nu .2.5005 nu .2.501.6 nu 2.

2051 m5686 n5691 n

3.2.2.

desired and whether a half-price used tubeis desired when a new tube a out of stock.g@EE1!p0N1pp are mailed with pour invoice for

TABLE 3.1¡ prices listed for now tubes

OLDER TYPE-EUIBER TUB13 - ued tube. are IEalf nee prim.11

17.6 n1R5 m194 n

5...

634 n6917 m6927 m

+.s.3.

12816 m121.6 m12417 m

.

.

3..5016 nu

5017 nu117-

3.3.

C[-5703 u5749 u

2.2.

out-oí-etoek tubes, or when, by cuetonerrequest, a used tube is substituted for anout -of -stock new tube.

(3) All orders are shipped parcel post - noC.O.D. ZICiADt 1 70@ 002710E LSDRAIDLIIO. Musics RATES ARE 30d fororder underr$50$50..00. TEIA9 RR4IDUQITSADD 5% STATE SALES TAI.

1DBM ORDER $3.00

0 u1*3 nlµ nu115 ulA6 n

nu184 n

íB5 u105 m106 n107 u105 u

.

3.3.3.3.2.2.

3.

3.3.

.

523 m524 nu613 n614 m6íS n616 m '3.617 m618 nu684 m685 nu .4.686 m637 nu

2.2.

3.4.3.

4.3.4.

4.4.

611S no714 m715 a716 m77 m718 m7117 m7107 m7íE7 u784 m785 no786 m

3.

3.3.3.3.3.3.3.3.3.3.3.

14C5 m1407 a1417 n1418 ní4B7 ní4T7 m14377 m 1

í4Q7 m14171414 n15 u ,

19 m -3.

3.3.3.3.3.3.3.3.3.3.5.

5556 m57 .Au58 u59 n7017 n70:.7 m75 m76 m77 m7$ m79

3.;,

3.3.3.

3.3.3.3183.3.

3.3.

135 °u1T4 m115 m105 m2C26 u212 uy m

m°

318 m394 m314 m

.

.

.

.

3.3.

2.3.2.

.

.

6307 m6397 m635 u6317 n6307 m63E7 m6.477 m6317 m6í9l.7 m6317 m6307 m6417 m

'.3.

+.3.-.

2.

.

2..

12907 n12375 n12577 n12$07 m123E7 n129.17 m3.12317 m12317 m12317 m12317 m12387 m1216 m

3.'.+.3.3.

3.

2.

3.3.

Z3 nu117-14 u

807 m879 n884 n930 n

950 u955 u958 uCt-1005 u

$3.

3.5.3.5.3.

.

.

3.

5751 m5814 n5879 n5881 u5992 n6080 u6842 a6973 n7193 u1190 m11-105 n

2.2.2. I

4.2.4.2.

.2.2.2.

$2.

1D6 m.

. 688 m 3. 787 u 3. 241 m 3.no

80 m 6114 m . 6357 m . 1246 n . 11158 u 3. TR- ,

1E5 u 3. 605 nu 2. 788 m 7. 25A6 061871m . 6307 a : 1274 nut 2. 1201 u 3. 150 m $2.

TABLE 1.1 I cuss ENVELOPE TUBESOLD STYL LA 1E7 n

174 n3.3.

606607 n

3.3.

7C5 m706 n

3.3.

2517 m2596 u 3.

82 u831r

3.3.

6AC5 m6107 ml

2.

3.

6317 n

6116 nu.

2.

1914 m3515 m

3.3.

1203 u1232 u

3.3. 174í111Cet

DI

all ere used,

I1

thoroughly tested

V IA MAJESTIC

104 m105 u106 u

3.3.2.

6C8 mi606 m66377 n

3.J.3.

707 no716 u717 m

3.3.3.

2506 u25L6 m259 u

3.84.

3.

am

85 m89 n

3.3.3.

WOnu6125 nu6127 a

.

.2.

614 m675 m675 u

+...

3505 m3516 m35114 u

2...

1273 u1612 u1625 u

3.3. Zs4 a 2

ós17 a

01210 5. C1326 . 91227 3. 62793. 1R4 u

1145 m 3,3.

616 n617 u

3.3.

m778 m 3.

3.

2515 m2576 nu

+

2.117-L7 m $4.

6ÁQ5 ml 2. 617 u 3524 m_

+. 1626 u

_

3. 3515 °

U122101227

. C3273. 01332

3. 91551 3. 03533. 92280 2. A.P. 5.

186 mn

'.3.

675 nu676 nu

3.3.

707 u717 u

3.

3.

26 nu2616 n 3.

117-26 m 3. TABLE 5 I BALLAST TUBES - $3.00 each - all are new '. ,

0222635

013453. 80 2. PERRDIAN PRILCO

í1.A6 m1114 nu

3.3.

677 nu678 nu

5..

7J7 n717 u

3.3.

2617 m27 nu

3.3.

9002 a 3.9003 a 3. J7D Type A,B & C; 136A; E1.9B; 1800; 1928)[7458; L55B 2814

2504;3701240

$3. 01380 2. 1-281PA224 2$4. .

1105 n1206 a

3..

606 m686 m 3.-717

2.m

717 no3.3.

2807 m30 nu

3.3.

1152 u .

JIB a 3.

347. 4P45; 71411; 4011: 100-77: 100-79: 1051; 16544; 1í}5R4;

600711. ~sans 3177: VICTONEEN 1300-8

0124571A01210

. RATIONAL 27

5. 111101 ACE 362. 117311! $3. 1%.4 $4. 37

3.3.3.

1LD5 m1L13 n1113 n

3..

615 -; m

677 m678 u

3.3.3.

7Q7 m717 n737 m

3.3.3.

31 m32 n3216 u

3.3.

13111 u 3.121. m 3.

WE HAVE MANY MORE -RECENT -TYPE -NUMBER TUBES AND EARLY TV TUBES

866 $3. 11224 $4. 71A8o

5.2.

11,05 n

1114 nu3.3.

615 m616 m 3.

3.717 m726 a

3.3.

3217 n33 n

3.3.

1DOITmrAT $2.00 new and $1.00 used. Send a .elf -addressed stampedenvelope with your requests.

AK.KTD21

O SOL3.CHOSL1sT

1115 nu115 nu

3.3.

6[7 m618 nu

3.3.

717 u714 m 3.

3.34 m35 mu

3.3.

231 mDIAGRAM SERVICE We furnish diagrams k

56 3.D227

2. 56 $3.

3. WIZARD175 ml1Q5 m

3.2.

615 nu.

616 nu3.3.

724 m1217 ma

3.3.

3514 u35Z3 m

2.68rí

a i3.1O/VTa

SCHEMATIC -- can schematic

technical on almost any radio from 1920 to 1954 from ourdata. Send a self -

ill 245 3. 226 $4. 3ILVERTONE 11 n . EL? nu 3, í2A8 u 3. 36 u 3.25 s1í4. library of original manufacturers service

$1.50 This

$3. 227 $3. 243 nu 5. 645 n 3. 1287 u 3. 37 au 3. 22 u 5addressed stamped envelope and per radio set. offer

is limited to five photocopied pages. If your set exceeds five214 nu2152A5 3.

616 nu607 nu

3.3.

í1B8 u1205 m

3.3.

38 nu39 nu

3.

3.6144 u j, we send yeu a quote.

u2A6 3. 605 nu 3. 1208 m 3. 41 nu 3.

9004 n $4.

TABLE 2.) SPECIALS

nu287 nu 3.

3.

697 nu617 nu

3.3.

1275 n1275 m

3.3.

42 nu

43 nu3.3.

53 nu6146 n 3.1620

e ?R WARTED -- LITERATURE AND HISTORICAL DATA ON{

OlA new in original cartons (nw style) $6.00Cunningham C1350 used $5.00Radiotron UI-200 new In original carton. $7.00Westinghouse projection bulb (very old)

306 n

3274 n

3Q5 nu5E4 u

514 nu

3.2.2.2.

637 nu648 n677 u618 n

3.3.3.2.

1277 ml1217 m12[8 m1297 m

3.3.3.

3.

44 nu45 u46 nu47 nu

3.

5

u 3.l` j CLASSIC RADIO MANUFACTURERS IN THE

-

NIIETH1f THIRTIES. E.H. SCOTT,

- - -MCMMURDO SILVER, LINCOLN, FISHER

--AND OTHERS. WRITE J.W.F. PUETT

Type T20 C137 5m watt new $4.002í2F used $15.00WesternElectric161

15.00Typee used $15.00

504 nu534 nu5E4 nu

2.2.2.

6U6 nu617 nu616 nu617

3. 1223 º14.44 n1447 u

3.33.

48 n

49 n

5045 nu

5..

2.Send a self-addressed stamped envelope fora free copy of ourClassic Radio Nwaletter. We offer free technical advise for a

Aretures Type (blue glass) used $5.00Arcturus Type 27 (blue glass) now in original

514 m513 m

2..

nu616 nu

3.2.

1485 n1486 m

3.3.

5006 n5026 nu

2.3.

self-addressed stamped envelope or you may call J.M.F. Puettbetween the hours of 6:00 & lD;ÓO PM Central $tyarU Time PLEASE,

carton $7.00 514 m . 624 nu 2. 1488 n 3. 51 mu 3. We are allay» glad to help if we can. call a/c 214 279-8309

1

II

5

$

min naesass 1 now aseoxea 1 rmT >oaersaza 1 maw aurrsalro ronT masaaics 1 ism iatzNasa 1 ram nawiarca 1 rum sus -rooms 1 rmT naeae.aa 1men nac7sall:s 1 nsrT nsTaEmrce

MARPOR CLASSIFIED ADS

tw.Weeds

or treLeer

threeLww

lrti.elamerlime

1-16 1.16 14/ 1.46 11.7010-/0 1. LSO 4.1/ 11.1011-.6 1.55 100 4.10 17.1010-40 12/ i.t0 /.00 2/.18

1.00 4.40 0.11 21.0800-60 2.74 4.50 0.55 50.4311-06 /.01 1.10 7.55 20.00sloe 3.50 0.10 1.11 10.8011-55 0.55 0.10 /. 06 12. 0646 -TO 1.00 4. 711 0.16 16.0011.75 4.11 7.25 10.10 30.2076-60 4.41 7.7/ 11.00 40.7051-36 4.70 /.10 11.70 43.20/0-00 1.00 1.70 11.34 01.5001-18 0.16 0.50 13.06 44.0000-100 ._. 1_50 0.55 13.76 MOO101-110 .. 0.06 10.55 11.14 50.00111-110 - 0.55 11.1/ 10.10 51.00111-130 _ 7.10 11.11 17.16 60.10131-140 _ 7.71 12.50 10.1/ 71.21141-1/0 .. 0.11 14.40 10.01 70.3000 per were per locus over 150 wards

Photo ad =2.00 extra.

MISC.

The HORN SPEAKER,.,.. 9820 Silver Meadow Drive. Dallas, Texas 75217

PHONOGRAPH COLLECTORS, join the Amer-ican Phonograph Society. Receive the

quarterly Journal and four Newslet-

ters. Receive free reprints and ster-

eoscopic phonograph cards. For more

information send 10¢ stamp. For one

year membership, send 16.50. The Am-erican Phonograph Society, P. 0. Box

5046, Berkeley CA 94705.

WILL DUPLICATE exactly, the mutilatedpanel for your antique radio. Send

sketch or rubbing for quotation, orwill trade for antique radios ofequal value. Norman A. Parsons, 22

Forest St., Branford CT 06405.

Mill REPAIR, restore, refinish, re-new or rebuild your old radio. Buy,

sell or trade tubes, parts and radios.Bob Lucas, 9014 Mahoning, Houston TX

77036.

FOR SALE OR TRADERARE RCA VICTORS: Model 7-3Radio Record Player C1926 1275.00;Alhambra I X275: Early OrthophonicCredenza 1'350.00; Model 9-18 Mint;Extremely Rare Model 9-25 Mint; Ex-tremely High Quality Microphonesand many early Radio Books; Grand-father clock -radio, self windingclock and Elra Radio in Dooley Cab-inet cannot be told from actualGrandfather clock C1930; Rare "Mon-arch Special" Victor talking Machineheavily carved cabinet.

NEW OLD TUBES FOR SALE:

350 #10; 500 ,'24_x.;

1000. #27; 100 #47;

350. ¡'71A; loo #35;

50 #81; 5o //76

500 1803000 tubes - Price 11000.00.Also many other hard to find tubes.Bruce Hertzberg, 343 Wagaraw Road,Hawthorne, N. J. 07506. Phone 201

423-3830.

FOR AIL your requirements in British& European vintage radio, 1220 to1950, contact "Tudor Rees." Our full1975 Catalogue now available, sentvia airmail to the U.S.A. for twodollars. Tudor Rees, Antique Wire-less Service, 64 Broad Street, StapleHill, Bristol, BS16 SNL, Great Britain.

FOR SALE OR TRADETRADE: Twenty-four Edison Blue Am-berol four minute cylinder recordsin excellent condition in originalcontainers for antique battery orAC radio equal value. Leland W.

Smith, Box 38-B, Route #3, Jasper,Arkansas 72641.

WIND YOUR OWN COILS, audio trans-formers, etc. Stevens coil winder.Complete, counter, motor, auto brake,foot control, good condition. "100.00or trade for radio and wireless gear.Guy Martin, P. O. Box A, Azusa CA91702.

TRADE: Crosley 52, Radiolas IIIA,25 w/loop and VIII Port. 200 newtubes in boxes for early electrice.For sale by lot. SASE for tubelist. Steve Meyerkorth, 2208 So.50th Ave., Omaha, Nebr. 68106.

FOR SALE: Surplus obsolete and seldom

used tubes. New, used and seconds,have 6C8, 6D6, 6N6, 7B6, 41, 47, 84

and others, 50¢ each. C. Elmer Nelson,

824 S. Pleasant St., Princeton, I11.61356.

EDISON CYLINDER PHONOGRAPH Ambrolla30. Needs some repair, but in nicerestorable condition 1150.00. Phone269-8522, Glen Woody, Box 44, Mount-ain View, Ark. 72560.

WD11 Adaptors, use UX199, 120 VT24.No wiring changes, Radiola III'sbattery hook up included 15.25 pp.,2 for 59.25. Keith Parry, 17557Horace St., Granada Hills CA 91344.

FOR SALE: 25 antique battery sets,

etc. 201A--'.12.00, X99 --x`3.50, V99--

14.00 plus postage. Send SASE.Lane, 2301 Indep. Ave., Kansas City,Mo 64124.

TUBES FOR EARLY RADIOS AND TV's.Send want list for lowest prices,trade in some types or others.

Jim Farago, 247 W. Park St., So.St. Paul MN 55075.

FOR SATE: Rubber stamp with yourname and address plus AK Radio andspeaker -3.00 pp. James Fred, P. C.42, Rossville IN 46065.

TAPES OF OLD RADIO PROGRAMS: Reel -

to -Reel -8 Track-Cassetes. Free list.The Radio Tape Library, P. O. Box805, Bakersfield C. 93302.

ONE 7.0T PRICE: Large number of sets,horns, cone speakers, misc. parts,magazines. Also other sets andCST's. Send SASE. Brewster, 1 Con-cord Rd., Fishkill, N. Y. 12524.

FOR SALE: Misc. tubes and radioparts. Send SASE for list. G. B.Schneider, 6848 Commonwealth Blvd.,Parma Hgts., Ohio 44130.

SELL OR SWAP: Twenties and thirtiesradios, tubes and books. Send SASEfor list to Jack Smith, Rt. 2, Box418, Gainesville, Fla. 32601.

11

WANTED

WANTED: Telegraphone, MagnecorderSD -1, pre -194b Wire recorders;

books on recording and pre -1936television. Buy or trade. H. Layer,AV,SFSU, 1600 Holloway, San Fran-cisco CA 94132.

WA.3Tl;ll: Radiotron type UV202 tubes,

Western Electric type 104D, 102G,131D, 275A tubes with good fila-ments. Also one General Radio aud-ibility meter (1920 vintage). Two

early make .003 M.F.D. variable tun-

ing condensers. LaVerne Lantz,

R. R. 1, Marseilles, Ill. 61341.

WANTED: AK -Breadboards, Radios be-fore 1926, early Disc TV's, Radiomagazines before 1927, outside hornphonographs, etc. Please give

prices and condition in first let-ter. Thanks: Charles D. Rakes,

Box 445, Bentonville, Ark. 72712.

WANTED: August, October 1943 RadioNews. Kennedy, DeForest headphonesKennedy Horn speaker. EscutcheonPlate, knobs for Fhilco 70. GregDockter, 1913 Kennedy, Bismarck,N. Dakota 58501.

I WILL ANSWER ALL correspondencefrom 1914 to 1926.

Am looking for an E. H. ScottPhantom 41. Cabinet per page 3Oct. Horn Speaker. Charles Ham -mans, 460 Hill -Top Rd., CovingtonIcy 41015.

WANTED: Antique Phonograph Catalogues,all brands. Literature collectionsbought. All replies appreciated. I

also collect machines, particularlyColumbia Graphophone. Ernest Allen,2803 Sims, Overland MO 63114.

WANmD : Swap want lists and forsale with anyone. Have many oldradios, parts, tubes, speakers, etc.also records 78's cylinder etc.Wayne Wright, Pocahontas VA 24635.

WANTED: Atwater Kent variometer orvariocoupler in mint or near mint

condition. Advise price.E. V. Brant, 6465 Sterling Ave.,Detroit, Mich. 48202.

WANTED: Scott Radios, good or partssets, Scott News or any other liter-

ature. Also Worlds Record 8, 9, or

10. J. Clark, 1617 Roselawn, Lansing,Michigan 48915.

WANTED: Face glass, seal & schematicfor 1941 Zenith Model #12S568 Chassis#12A1. Brent R. Miller, 1730 Magd-alene Way, Johnstown PA 15905.

WANTED: Information about Tuskaradios, schematics, etc. Bob

Sullivan, Sullivan and Associates,P. 0. Box 5345. Irving TX 75062

March '72

AK "Bread-

board

February '72

Marconi 106.

April '72

Tube article

by Lee DeForest

August '72

Emile Berliner

invente the Gram-

ophone

June '72

Edison Phottó-

graph, 1923

radio programs

BA

CK

ISS

UE

SO

RD

ER

NO

W!

THE HORN SPEAKER NEWSPAPER

All 10 back issues for 1973 $5.00

January '72

25c ea.

February '72

$1.00 ea.

March '72

$$1.00 ea.

April '72

$1.50 ea.

Hay '72

50¢ ea.

500 ea.

50¢ ea.

750 ea.

750 ea.

25¢ ea

June '72

August '72

September '7'

October '72

December '72

All 20 back issues for 1972 and 1973,

while they last...$10.00.

Any issue from Jan.'73 to now..50¢ ea.

January '73

1887 Electric

Phonograph

Lee DeForest 1902

Sspt,smb.r '72

Nilbola Tesla

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February '73

Eagle Grapho-

phone

Echophone "4"

October '72

WRR since 1920

Amos 'N' Andy

March '73

Multiplex Phono-

graph, Armstrong

receiver

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1975