Vol.V No.5 May 1976

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

THE NEWSPAPER FORTHE HOBBYIST OF VINTAGEELECTRONICS AND SOUND

HElIO Setal hono w rap,y _ecor

By Dr. iHT.ARiztItw A. KNAUSS, M.D.

HAVE been occupied for over oneyear on the design and perfectionof a playing conune cial phonographrecord. double disc, made entirelyof metal. I have now succeeded

in producing this article, samples ofwhich I have successfully demonstratedto the editors. There are certain tcrnvin the phonograph record which willillustrate more clearly than anything elsethe problems involved in the productionof records.

First of these is, "surface." -As nearlyeveryone knows. there is i tremendousweight concentrated on the small area ofthe needle point. The material carrying

PL GER

(THEIR INVENTOR)

printing or stamping operation after theproper dies are made.

In the process of making the indestruc-tible metal record, which I have namedthe Duramel Disc, I carry the electro -deposition several steps further. It iswell known that playing records havebeen made out of copper since the in-ception of the industry. However, thesewould not hold up for more than six oreight playings, at most, because the cop-per soon began to spin under the tremen-dous weight and the tool action of thesharp needle. Therefore. I first obtaineda hard surface by plating an alloy ofhard natal directly against the model.

Wax

CopperSo/u/io n

SIX Mo/hersface down

F/y 2Press containing

heal unit

;_iSar/Melol/

Sheet 7i

PlatPn L c7

ANviz_------

Center Pin

Copper Disc

PlatenRe Cord holfface up

Six Mathersface upnnrus

apse con/aininheal uni t

/C(9.4

CopperAnode

CopperLayer

Mckefface

SpecialAlloy to

After some experimentation, I foundthat the only thing which would properlyhold the two pieces of thin metal togetheris tin. The front or playing surface isproperly protected. the back surface isproperly cleaned, and the two shells arethen fitted back to back under pressureand heat. I have designed a special de-vice for making this a simple mechanicaloperation which can be done by almostanyone with proper instruction. The dc -vice illustrated can he used to put to-gether two hundred or more at a time.

One of the first questions asked by thepractical phonograph man is. "Where areyou going to get enough models and get

Nickel Alloy/otea Plasle

Nickel- ---

Copper-

Cheap MetalSocking

Anode

NickelCopper

Direct SpecialAlloy facedhb/her(deposiled)

fiy..3

AnodeRecordModel

Science and Invention for October, 1921

Tin foil

ecordho/f; facedo n

figsThe Author of the Present Article has Developed a New Process for Making Metal Phonograph Records on a Commercial Scale, Which are Both L ighterand CheaperThan the Present Records and Moreover, Thai Play with Practically no Scratching and with Infinitesimal Wear. The Successive Stages in Making the KnaussMetal Phonograph Record, a:e Shown Above, and Those Familiar with Electroplating Will at Once See How the Problem Has Been Solved. The First or Master

Record, Recorded in Wax, Is Made Suitably Conducting by Coating with Powdered Grafite. A Special Alloy Deposition Is First Made on the Wax.Fig. 2-I:o,v the Special Alloy Record Is Re -enforced with a Copper Deposit in a Copper Sulfate Bath. Fig 3-Nickel Alloy Faced "Master" Record, Placed inSpecial Alloy Bath and Thus a Direct Special Alloy Faced "Mother" Record Is Deposited. Fig. 4 Shows a Scheme for Impressing Six Records on Top and Bottomof Lead Sheet, Which Is Afterward Placed in a Plating Solution and the Record Faces Deposited Thereon. Fig. 5 Shows an Electric Heater for Sweating Two

Metal Record Faces Back to Back to Form a Complete Two Faced Record.

the groove which has to sustain thisweight and yet track smoothly must besmooth and tough, and should be unbreak-able. Heretofore, the nearest approach tothese qualities was found in a mixtureof shellac, rottenstone, graphite and paperfloc, known to the industry as "stock."This mixture, when heated and pressedwith dies while warm, takes the impres-sion of the sound grooves from the metal"stampers." These metal stampers aremade by electro -deposition of copper, thesurface of which is subsequently platedwith a very thin -coat of nickel. This givesthe printing or stamping surface. It isseen that the present method becomes a

This shell is then backed up by electro-tleposited copper, as shown in the illus-trations. We have, then, a single -facedrecord, the grooves and playing surfaceof which vast be absolutely accurate re-productions, because they arc depositedwith molecular accuracy.

But it became immediately apparent, inthe course of my research that no singlepiece of metal would remain flat underthe weight of the heavy tone arm of thephonograph. The single sheet of metalwould invariably curl and buckle. Ofcourse this led me to the making of doubledisc records by placing the single ones"back to back."

theta quickly enough to deposit the metalrecords?" Suffice it to say that this is.one of the things which makes the processcommercial, and it is entirely solved. Bymeans of a pressing operation in softmetal, illustrated in the diagrams, it ispossible to turn out twelve thousandmetal forms a day from two dies and onelarge press. On these forms are depositedtwelve thousand halves. or six thousandwhole records in a period of three hours.following their being placed in the electro-lytic bath.

Thus twelve thousand halves are striptfrom their models at the end of three

Monthly except during July and August Price : $14.50 yearly Single Issue 750 Publisher, Jim Cranshaw..

214-286-1673

TF;TEPHONE CENTENTdIAL

1876 - 1976

hours. The models are then replaced,and the process goes on continuously fortwenty-four hours, during which timeeight sets of twelve thousand each arestript from the models. This makes atotal of 86.000 halves or 43.000 wholerecords, in 24 hours.

After the first set of twelve thousandis stript from its models, it is necessaryto center and trim, after which twohundred halves arc placed on a centerpin, with tin between the backs, and adisc of copper between the fronts.This string of two hundred is thenplaced in an electrically heated device.and under pressure, the backs are:;weated together so that the resultis one hundred perfect playing rec-ords. It is thus only necessary to havesixty of these "stoves" in order to put to-gether the twelve thousand halves. Thisoperation requires less than three hours,so that the "stoves" are ready for the nextset of shells when they come out.

The number of metal records and thespeed of production arc entirely dependenton the equipment, which costs only one -tenth as much as that required for thecorresponding production of the othertype of record.

The result speaks for itself. It hasscarcely any surface noise, due to theideal bearing surface of the metal needleon metal. It is so nearly indestructiblethat only the most extreme mechanicalviolence will destroy it. It is fireproof,waterproof, acidproof, rustproof, un-breakable, light in weight (weighing onlysix ounces, which is two ounces less thanthe -common record of ten inches diam-eter). The metal record can be sentthru the mails without loss frombreakage. It costs less for packing andhandling.

The actual material used in the DuramelDisc costs less than six cents, which isless than that of the common record.

Being made almost entirely by electric.processes, the energy used can be obtainedat a microscopic cost per record, wherepower is cheap and figures in on a yearlyor overhead basis.

Thus it is seen that the metal record isscientifically correct. It is commercial,practical, and the product is indestructi-ble. It can be cheaply made and it is abetter article than the present type.

1921

TUBE COILECTORLook, what I found, abrass -base WD -11 for 250.

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

Club NewsTHE BUCKEYE ANTIQUE RADIO ANDPHONOGRAPH COLLECTORS' CLUB

The following information abouta picnic with items for swap, showand/or sale from SOUNDINGS, theofficial publication of the club.PICNIC: August 3 (rain date Aug. 10)Ken Spriggel's. Plan to eat at loom(but come at 1 for more fun). Bringtable service and covered dish ordessert. (Meat & soft drinks provided).

Our annual picnic is the highlightof the year so bring the family foran afternoon of fun. Also, for addedenjoyment, please bring items forshow, swap and/or sale.

A name and address for the Club is:David A. Lieberth, 490 Mineola Ave.,Akron, Ohio 44302.

OLDTIME ANNOUNCERS CLUB

Ray Poindexter is publishing someinteresting information about oldtimebroadcasting. Announcers with 25years or more experience are entitledto BROADCAST. There are now two edit-ions. Write to Oldtime Announcers

Club, P.O. Box 11711, North LittleRock AR 72115.

SOUTHWEST VINTAGE RJ)IOAND PHONOGRAPH SOCIETY

Under the direction of Glen Zookthe Society planned an exhibit ofold receivers and broadcast equip-ment at the Northpark Shopping Center.All members were encouraged to part-icipate in the event which was partof old time broadcasts put on the airby KERA-FM. These activities wereplanned for the first week to cele-brate National Radio Week.

THE AMERICAN PHONOGRAPH SOCIETY1976 OFFICERS

Art Wilmoth, was re-elected as

the president. Advisor Clifford Dewof Northfield, Ohio was elected vicepresident. Dave Fletcher is againthe secretary -treasurer and will bethe editor of the JOURNAL and NEWS-LETTER for another year. Dr. PhillipPetersen remains as the society ar-chivest.

By the way the 1976 advisors are:John V. Danner, Metuchen, N.J.;Tim Christen, Belmont CA; TimothyFabrizio, Bergen, N.Y.; Dr. HaroldLayer, San Francisco CA; Ray Phillips,Los Angeles CA; Larry Schlick, Wau-watosa, WI; Al Sefl, San FranciscoCA; Peter Betz, Johnstown, N.Y.:Bernard Skagfjord, San Francisco CA.

ANTIQUE WIRELESS ASSOCIATIONThis late information from the

March 1976 issue of THE OLD TIMERSBULLETIN of the AWA gave the fol-lowing information about the OldEquipment Contest held at theNational Conference in 1975. Thecontest described as the best ever,had the following winners:CLASS I REGENERATIVE RECEIVERS1st --Grebe CR -6 Lauren Peckham2nd --Paragon RA -10 Alan Douglas

3rd--Remler Panel John W. Johnson3rd--DIMA (German) John CapertonCLASS II CRYSTAL SETSist--1917 Cohen Ralph Muchow2nd--Nesco CN-113A Tom Brooker

3rd --Wireless Improve- Joe Pavek

ment WavemeterCLASS III TUNED RF RECEIVERSlst--AK-9 & Log F. W. Sloat2nd Kennedy XV Gary Schneider

3rd --Grebe MU -1 Ray Sieracki

CLASS IV SUPERHETSlst--11agnaformer John Caperton2nd --19211 Receptrad Alan Douglas3rd--Leutz Model C Lauren PeckhamCLASS V TUBE TRANSMITTERSlst--1919 Grebe Ralph Muchow2nd--DeForest OT -3 Tom Brooker3rd--VT-2 Modulated Wilson Norwood

oscillatorCLASS VI SPARK TRANSMITTERS1st--Torikata 1910 Ralph Muchow2nd--Clapp-Eastham -,1w. Tom BrookerCLASS VII LOOSE COUPLERSlst--Metero 1919 Ralph Muchow2nd --Cliff Navy Lauren Peckharq

3rd--Homebrew F. W. Sloat3rd --Antenna Tuner A.G. WentzelCLASS VIII LOUD SPEAKERSlst--Clapp-Eastham horn Burt Noyes2nd --Magnavox R-2 horn Gary Schneide-2nd --Two Sarnoff horns Ralph Muchow3rd--I.E. Knott Mod.B John JohnsonCLASS IX AUDIO AMPLIFIERSlst--DeForest 1915 Audio L.Whitlock2nd. -1920 Magnavox D.Cleland3rd--Porcelaines 1917 L.Peckham

(French make)CLASS X TUBESlst--Pickard 1915 Triode R. Muchow

2nd--Audion(Wallace) A.Douglas3rd--Pingen detector S.Johnson

LETTERSEDITOR'S MAILBAG

Dear Jim:I have thoroughly enjoyed my

first year subscription of The HornSpeaker. Enclosed is a check forT. 00 for my renewal.

I have only a few comments.I think the radio researchers andinventors throughout radio's historywere very sharp and ingenious, suchas DeForest, Fleming, Armstrong,Kent and Scott to mention only a few.But what about the cabinet makersfor radios? What were the theorieson cabinets? To a lot of people Ihave talked to the cabinets are theeye catch. Did the previously ment-ioned radio geniuses also design,experiment and develop the cabinetswith their fancy designs and select-ed choices of wood grains? Or, didthey leave this to a separate groupof people, such as Pooley? What a-bout the colorful separate speakercabinets and housings? What aboutthe speaker cloth designs:

In your opinion based upon yourexperience and the experiences ofothers which cabinets were con-sidered the fanciest and best look-ing?

These are a lot of questions a-mong others that I am curious about.

Perhaps you may have an article onsome of these items some day, orelse I've missed them. Your paperis very good. I wouldn't miss itfor the world. Thank you for thereading enjoyment.

Sincerely yours,Ivan L. Johnson313 Alice St.Deer Park TX 77536

Fd: A good idea for an article.

Dear Mr. Cranshaw:

Enclosed is a check for 1'2.16 foran ad.

I really enjoy The Horn Speaker.Thanks to Keith Parry for telling meabout it.

I started collecting radios about2 years ago when I was 111. I'm stillat it and save up my money from apaper route to buy them. My mainsource is garage sales.'hat got me on this, was a local radiostation playing old radio programs.I thought it would be nice to have acathedral style to listen to them on.During my search, I was surprised tosee the wide variety of items avail-able. After quite a search, I finallygot a U.S. Radio & T.V. Cathedraltype. What a mess it was: The radiowasn't much to fix, but the cabinettook over a month, working on theaverage of 4 nights a week, severalhours each night. It's now one ofseveral I now have.

Now I go through list after listsent to me by fellow collectors andhope there's something I can afford.Usually it's the shipping chargesthat kill it for me.

Do you know of any clubs or othercollectors here in Michigan? I wouldappreciate it if they would drop mea card.

I would like to see more firsthand accounts of the radio industryin it's early years. How about someof your older (or more mature:)readers contributing some articles?

Keep up the good work.Sincerely,

David Dazer2989 MaywoodPort Huron MI 18060

Dear Jim:'r',nclosed is an

same. I enjoy Themuch. The article

ad, and check forHorn Speaker veryon John A. Victor-

een was very interesting and helpfulto me. but I need more information.

I recently picked up an old radiowith the name 'Imperial Superhetro-dyne' on the H.R. panel, also dialmarkings, Tuner, Oscilator, Vol.Rheostat, Loop Ant. and speakerjacks. It had 8-201aux tubes in it.Parts are mounted on a wood chassisbase, with a ser. #1072. It is bus -bar wired, well designed and con-structed° All R.F. transformers aremarked and labeled, Victor Products,Victoreen Radio Inc., Cleveland,Ohio. I would like to know if itwas a kit set, custom built, ormanufactured. It surely doesn't looklike 'home brew:' as I have seen

The HORN SPEAKER 9820 Silver Meadow Drive, Dallas, Texas 752173

many of those, having built many inthe early twenties. Also what yearit was made. I have it restored andit works beautifully. I would an-preciate any help or information ofany kind about it. Many thanks.

Sincerely,Herb. DeGarmo203 3rd. St.Early, Iowa X0535Phone: 712 273-3571

Editor: Ray Windrix and Dr. Victor-een will probably help us.

Dear Jim:In reference to the March issue,

you pictured a Crosley Book Case re-ceiver. Inclosed is a picture of aSentinel book radio which I have.Although not too old, it is stillrather unusual. It. is 102" H X 6" WX 7k" deep. Uses 3525, 501.6, 123Q7,

12SK7, 12SA7. Model 238, 115AC-DC,19140s??

Gary B. Schneider68148 Commonwealth Blvé.Parma Hgts., Ohio 1414130

4;-:r -r. Cransi'=I received my copies of The Horn

Speaker and I want to say that Tfind them very enjoyable to readand also, they are filled with veryinformative information about oldradios and phonographs. Am very sat-isfied with it, keep up the goodwork.

Would like to see more articleson collecting records, about datingthem and also steps in their care,that is storing them and cleaningthe dirt off of them. Thank you andbest wishes.

Sincerely,William SmithHyattsville, Maryland

Ed: We are looking for more articlesto print about records.

Dear Mr. Crenshaw:

Inclosed is a check covering thecost of a renewal of The Horn maker.I really enjoy it.

I've been in the electronic repairfield, working as a bench tech., forabout 10 years now. And I've workedon everything from video tape record-ers to muti-band portable radios.Everything is just getting more com-plicated and difficult. I find thoseold circuits and articles a breathof fresh air.

Keep up the good work.Yours truly,

Touts K. Yadevia601 Church La.Upper Darby PA 19082

DOWN MEMORY LANETHOMAS H. "TOMMY" COWAN was the

first announcer in the Greater NewYork area. WJZ, Newark was put onthe air by Westinghouse in Sep-tember 1921. The transmitter hadbeen sent from Pittsburgh and waslike the one at KDKA. Cowan was a

company employee and was selected

to do the talking."This is WJZ, WJZ, WJZ, the

radio telephone broadcasting stationlocated in Newark, New Jersey.Please stand by to tune your sets.This is announcer Cowan, Newark."After awhile, he shortened it to"ACN."

During the first few nights,there was no program --just talk byCowan. Even this brought a consider-able amount of mail. Cowan decidedto put some music on the air. Hisfirst job had been with Thomas Ed-ison at Orange, N.J. He went to seeEdison to borrow some records. Theinventor didn't like radio. Appar-ently, he thought some of his dis-coveries had been used in its de-velopment. Regardless of his feel-ings, Edison lent his former em-ployee some records.

WJZ began broadcasting the WorldSeries between the Yankees and theGiants October 5, 1921. Cowan's

voice was heard reporting the action,but he was not at the game. A news-paper reporter relayed the happen-ings by telephone and Cowan repeat-ed them into the mike. It was sucha trying task that when the game wasover, he didn't even realize whichteam had won. (The Yankees won thefirst game, But the Giants took theseries.)

WJZ moved to New York the follow-ing year, and RCA acquired the stat-ion in 1923. Cowan left to joinWNYC, the city -owned station, aschief announcer when it went on theair in July 19214.

Recently, I called his former ad-dress in New York and learned thatCowan died about three years ago. Italked to former radio actor FrankRyan, who had known Cowan well.

From Broadcast No. 2, OldtimeAnnouncers Club, P.Q. Box 11714,North Little Rock AR 72115.

REACTIVATION OF THE THORIATEDTUNGSTEN FILAMENT VACUUM TUBE

By O.H. McDonald

The process of rejuvenation forthe vacuum tube was one of the manysecrets of radio that the old-timersused some fifty or sixty years ago.Try it it will give you justanother phase of enjoyment in thestudy of vintage radio. In placingmy mind and thoughts in those yester-years helps to give me the fulfilmentof this fascinating hobby of antiqueradio collecting.

In the 1920s vacuum tube rejuvenat-ion was not only an art but a big bus-iness. Radio tubes for the home re-ceivers on the average sold for around"5.00 each. Many so called "blackmarket" tubes were sold for about onehalf of that amount. The "blackmarket" tubes being the ones thatwere extremely weak and for all pract-ical purposes had been discarded.Many of these tubes were rejuvenatedand sold at the cheaper price withactually a higher profit. Around themid 20s manufacturers began producingrejuvenators for the service man.This was a big factor in helping tocut the ever rising cost of repairingthe home receiver. In this articlemy intention is to cover the generalrejuvenation process for the collect-or. An understanding of this pro-ceedure will enable the enthusiastto possibly reactivate some of hisweak emitting tubes. However, Iwould suggest that you cover thiscomplete article before attemptingthis process of rejuvenation.

Tubes are usually constructed withtungsten wire filaments. The numberof electrons thrown off by such fil-aments is greatly increased when a

chemical known as thorium is addedto the tungsten wire when it is man-ufactured. Filaments having thoriumdrawn with the tungsten wire are knownas thoriated tungsten filaments.Tubes having thoriated tungsten oxide

n

filaments operate at a much lowertemperature than those with othertyres of filaments and thereforethrow off very little light.

Tubes with thoriated tungstenfilaments are the only ones that canbe rejuvenated. If the filament isburning and the emission is low oreven zero, more than likely the tubecan be revived. Tubes that havebeen badly overloaded may not im-prove, but I will cover a "flashingprocess" for these tubes before youthrow them away.

The filament condition of a tubemay be most readily judged by anemission test using the circuitshown in figure #1. The voltages

F IGi!P.F

MA

AE2ISSIO:i TEST C1nCUIT

ote.. CLOSE SV4iTCH J::ST LO;:G EMOUGHTG GET READ I i1G OF: !.;A. A;ETER _PETERFILA:.ENT VOLTAGE HAS DEEM ADJUSTEDTO FATED VALUE. DIsR_GARn CHAfGEIN FILAi;ENT VOLTAGE L'HICH WILLOCCUR WHEN E;:1I3SICty CURRE¿iT FLo23.TEST FOR SHORTES ELEAE :Ts LEFOGETAKING E1 ISCIOMN RE LIi4Gspecified should not be exceeded.Higher voltages will possibly damagethe vacuum and may even result in a

burnout. If the emission is abovethe minimum value specified in the

4 -

table, the tube is in good conditionand does not need reactivating. If

equipment for reading emission isnot available a simple test for thetwo most widely used tube types canbe made on the customary tube testset which measures plate current.This circuit is shown in figure #2.

For UX-199 or CX-199 tubes, setthe plate voltage at Its volts withthe grid connected to the negativeside of the filament, set the filament voltage at 3.0 volts and readthe plate current. Momentarily in-

crease the filament voltage 3.5

volts and read the plate current.If the plate current increases morethan .2. MA, the filament is notfully active and the tube may beimproved by the reactivation pro-

cess.For the UX-201A or CX-201A tubes,

the same plate voltage of lay voltsis used but the plate current isread with the filament voltages setat It volts and 6 volts. An increase

of more than .2 MA in the plate cur-rent indicates that the tube may beimproved by reactivation.

If the tube will not return tonormal after reactivation treatmentit is proof that the tube has eitherserved its normal life or has beenso heavily overloaded that thethorium content has been exhaustedor the vacuum impaired.METHOD OF REACTIVATION -- The fol-lowing methods will generally re-store the emission, that is react-ivate, tubes which have been over-loaded and also, at times, will re-

activate, for short additionalusage, tubes that have dropped inemission at the end of a normallife. The exact process which givesthe best results depends upon theoverload to which the tube has beensubjected.

Tubes which have been subjectedto only a slight overload may bereactivated by a very simple process.This consist of burning the filament,with the plate voltage disconnected,at the voltage listed in the tableunder the heading 'Reactivation Vol-tage.' This process speeds up theboiling out of the thorium from thebody of the wire of the filamentwhile at the same time the surfaceevaporation is very slow when theplate voltage is not applied. The

length of time required to react-ivate a tube is from about fifteenminutes to two hours, depending onhow long the tube was subjected toexcessive voltages. At the end offifteen minutes, test the tube asexplained in the preceeding para-graphs. If the emission shows im-provement continue the treatmentuntil the tube tests above minimumpassing limit.

Tubes which have been badlyoverloaded may not improve duringthis process, and a 'flashing' vol-tage may be used, as outlined inthe next paragraph.

First burn the filament for ten

The HORN SPEAKER 9820 Silver Meadow Drive, Dallas,

AtF IGURE_,:;,2 PLATE CURfEflT

TEST CIRCUIT

Texas 75217

or fifteen seconds at the 'flash-ing voltage.' Then burn the fil-ament under the process first dis-cribed, using the reactivation vol-tages. Read the emission at the endof about thirty minutes and if notimproved, continue to burn the fil-ament for about two hours, takingreading every twenty to thirty min-utes. If a couple of hours treat-ment does not restore emission orgreatly improve it, then the tubecan not be reactivated. No plate

voltage is every applied duringreactivation. The applied vol-tages should always be monitoredby a suitable volt meter. A smallpercentage of the tubes reactivat-ed by the 'flash voltage' processmay be expected to burn out duringthe flashing period, but these arethe tubes at or near the end oftheir normal life.

Rapid reactivation, sometimeswithin ten minutes, can be accomp-lished by the use of voltages high-er than those recommended in thechart. This process very materiallyshortens the tube life and such re-activation is generally not per-manent. Furthermore, the usage ofhigher voltages greatly increasesthe percentage of tubes that burnout and the filaments are in worseshape than they were before theprocess started. This hurry up pro-cess of rejuvenation should behighly discouraged.REACTIVATION EQUIPMENT -- Alternat-ing current from the house voltagesupply is most convenient and canbe stepped down to the proper vol-tage by a toy or bell ringingtransformer. There are numerousstep down transformers availablewith several step-down taps toselect from. Connect the trans-former in series with a 15 to 20

OEM variable resistor and the fil-

ament as shown in figure #3. Againuse a suitable volt meter in ad-justing voltages. Most A.C. volt-

meters draw heavy currents andshould not be ?.eft connected tothe circuit for long periods oftime. Tf an alternating supply isnot available any direct voltagesupply can be used. The largervoltages for flashing may be ob-tained from "B' batteries. Only

one tube should be reactivated at atime in order to keep a close watchon the voltages at all times.?;0RANAL OPr,RATTON PPECAUTIONS -- If

it is necessary tc reactivate tubesat frequent intervals, it is proofthat the tubes are being overloaded,and better service can be obtainedif the following precautions areobserved:(1 Do not operate filaments at

higher voltages than what theyare rated. Keep the filament

FIGURE

REACTIVATING CIRCUIT

rheostat set as low as possible,if possible use a reliable voltmeter.

(2)Do not use high plate voltagesunless 'C' batteries are used.With types C-299, CX-299, UV -199,UX-199, and CX-3012, UV -201A andUX-201A better life is obtained,and 'B' battery current drain islessened when a voltage of 672voltage or less is used in theplate circuit in case no 'C' bat-tery is provided.

(3)Be careful when changing batteryconnections to see that the bat-tery polarities are not reversed.If the leads connecting the fil-ament supply or the grid bias sup-ply are reversed, the signals andmusic may still be heard, butthey will be faint and distorted.Such a reversed condition oftencauses the operator to turn thefilament voltage to a higher set-ting, thus injuring the tube with-out an appreciable results. Al -

TUBE TYPEF I LA',`ET

VOLTAGEPLATEV OLTAGE

, MAXIMUM

M I(J I°r4UM

EMISSIONIiiAX IPUic+

REACTIVATIONVOLTAGES

?,"AX iIVIJl.i

FL%;S N 1f1G

VOLTAGE199 OR 299120 OR 220201A - 3 01 A200A - 30OA171 OR 371

3.33.39.05.05.0

5050505050

6 MA

15 LtA25' MA12 MA

50 MA

4.04.07.07.07.0

.

1010

151515

T;:SI,E OF E=f,'.,1SS I Ofi CU;=;EiiT AHD REACTIVATION VOLTAGE

The HORN SPEAKER,,,,. 9820 Silver Meadow Drive, Dalias, Texas 75217 5ways check battery connectionsafter making any change.

:_;If an insensitive tube and a tubein perfect condition are operat-ed from the same rheostat, therewill be a tendency to overloadthe good tube in order to obtaina better response from the weakertube. The weaker tube should bereactivated or replaced. Hereagain the use of a reliable voltmeter for the filaments willsave overloading the tubes.

')When using C-299, CX-299, CX-220,UV -199, UX-199, UX-120 types and

a filament volt meter is not av-ailable, the operation of the setmay be checked as follows: Con-nect two fresh dry cells in series

(3V) for the heater voltage. Therheostats now may be turned onfull (no resistance) and if theset and tubes are operation* cor-rectly, satisfactory receptionwill be obtained. If the re-sults are not satisfactory checkbatteries, battery connections,aerial connections and tubes.The two fresh dry cells will of-fer satisfactory reception whenthe trouble is located in the re-ceiver.

GENERAL COMMENT -- The voltages spec-ified in the table are the maximumwhich should be used, A volt metershould be used to set the appliedvoltages to the proper values in or-

der to obtain the proper results.Tubes which have internal shorts

between elements can not be react-ivated and it may be convenient tomake the short test with an OHY meter.If an O:Ifii meter is not available a

pair of headphones and a dry cellconnected in series will work satis-factory in locating shorts if theyexist. When the tube is not lighted,there should be an open circuit be-tween the plate and the grid, theplate and the filament, and the gridand the filament. There should be aclosed circuit between the two fila-ment connections.

Tubes in which the vacuum is im-paired can not be reactivated. Thisis usually indicated by a filament

T ove.E Ft 01111G AM1ctE RSERv\Q S REPR\WTS TUSES BooKS OR Amy -T% t4G ERLAT TOV i Nfr E E LEc o 4 c.5 ?

TRY TH-C-.sc BOOKS AND \t00 Nv e. ARED-ERENCE L\BR Nst\k FoR THE ENTkl E klaU)

NOW AVAILABLE in Standard form or living COLOR, ready for Vacation Time, the onlypublications in our hobby that travels by CAR and PLANE: NEW 1976 QUARTERLYNTI UER'S . rECTORY and COLLECTOR'S GUIDE ERV CES, covers all phases of our lobby

from A to Z, Crystals to Classic Sets,over 75 x 11 pages with protective cover.ORDER same old price $5.00 (five years), OR SEND $9.95 and we will copy all photo-graphs IN LIVING COLOR where applicable...ANOTHER FIRST FOR OUR HOBBYJJJ

1976 AD

1976 Running Mates LATEST FLEA MARKET QUARTERLY, list all known markets in the U.S.A.and Canada, State by State, City by City, this interesting book is loaded with moneysaving and making ideas, collecting trends, lifestlyes, CONTAINS: almanac, planningcalendars, many persons will be surprised at the number of markets located aroundthem and never ever been to one, THIS LS THE PLACE FOR OLD RADIOS, 48 pages and over3000 sold per Qtr., ONLY $2025 per Issue.

NEi ***NEW***NEW***NÉW***NEr4Y Do ~N.yf4H11(NEWliMiIEW414HéNEM40-**NEdIH1444NEW411-»x-~~NEREPRINTS::* * * * * *REPRINTS * * * * * *REPRINTS * * * * * Oi.EPRINTS * * * * * *

ORIGINAL ATWATER KENT 1924-1930 FACTORY SERVICE MANUAL ENCYCLOYLDIA REVISED/SUPPLEMENTWhy wade through tone of different publications looking for wiring diagrams and servicedata? Even if you have others, ever wonder why it lacked the information you stillneeded? It was not economical to publish all Service data on each Model and thesemanuals were only given to AK authorized Distributors, therefore they are RARE andnow you can have one PLUS all know Supplements to 1930, Contents: Over 300 photo's,illustrations, wiring diagrams, charts, ElecfAecho views, all accessories, 14 MAJORSECTIONS, Section VI alone covers 16 models (each a FSM itself),60 pages of RAREsupplements, 1923-30 NUMERICAL PARTS LIST AND PRICES FOR ALL AK'S MADE, they were madeby the PART NO. and NOT MODEL No., Starts with the Breadboard MODELS: 9 thru all modelsup to and including the 1930 AC model 67. Total 55 models, SPEAKERS: 13 differentmodels from the Horn Speakers, E-3 Flange, Lug -types thru the Dynamic F -7A series,

r` TO `i$ii* C tubes, Reostats, VC'S, Var., and Synchro Condensers, belts, pulleys,parts, amplifiers, transformers, troubleshooting all models point-toiepoint, causes,CODES. We have added a special biographical story on A.Awater Kent and his Company.The Encyclopedia is over 220 pages, divided in three 8* x 11 Volumes with protectivecovers, each weigh 3 lbs. If you are an Atwater Kent fan and or been having troublerepairing them, this is the most comprehensive service manual ever published, EntireAKFSM Encyclopedia Only $15000 ppdo

NEW COLOR REPRINT 8i x 14 CHART 1920-33 Color Code of 54 Carbon Resistors in StandardValues 50smolms to 10+nsg-.ohms, plus a small modern version with Ohm's Law, suitablefor Framing, solve all your mystery resistor problems now, Only $2021 ppd. each,IMPORTANT: Unless otherwise Specified All Books Shipped BOOK RATE. First Class Add $3per bóo-T, 350 for Special Handling (as fast as F/C), Insurance Extra, If in doubt leavecheck blank, we will fill-in or refund excess. Calif. Res. 6% tax., CANADIANS: Use sanerate as USA, NO insurance on AIR, Payable in U.S. FUNDS, NO STAMPS, add 5"0¢ for yourcheck exchange rate, SAME FOR OTHER COUNTRIES. Delivery Book Rate Four to Five weeks,U.S. Postal Service now requires a week for 'irsfl Class Mail. We require One week to10 days to Process and Deliver. THEY take three to four weeks. First Class -!APO WEEKSI

ORDER ALL: HISTORIC_gL RADIO SERVICES, BOX 15370, Dept. HS5 Long Beach Ca. 90815 USA*

1976 AD

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DALLAS TEXAS 15228

6 The HORN SPEAKER 9820 Siker Meadow Drive, Dallas, Texas 75217

current reading above rated value.If considerable air is in the tube,the filament will not light up atall unless the voltage is raised con-siderably above the rated value. inwhich case the filament may burn out.

Cunningham types C-11, CX-12, andCX-200 and radiotron tubes as WD -11,

UX-112 do not use thoriatedtungsten filaments and can not be re-activated.TESTING THE 200A and 300A DETECTORTUBES -- The UX-200A or the CX-300Atube is designed only for service asa detector and differs from the othertypes of tubes in that it containsan alkali vapor. The formation of thevapor occurs during the first threemintites after the tube is lit, dur-ing which period the tube charact-eristics change rapidly causingvariation in the plate current andpreformance of the tube when operat-ing in a radio receiving set. As soonas the tube warmed up, or at the endcf about three minutes, the readingsbecome uniform and no further changesoccur. As a result of this action,readings taken during the period ofchange are variable, and are of novalue. However,. since the change doesnot usually began until about oneminute after the voltage has beenapplied to the filament, it is pos-sible to make a quick test immediatelyafter the voltage has been applied,otherwise; the readings should betaken at the end of the three minutewarm up period.

Tests on the 200A and 300A seriestubes should be made with a platevoltage of 45 volts and no highervoltage should be used. Since thesetubes are designed for detector ser-vice only, a thorough test of thetubes require considerable equipment.Plate current readings, such as takenin the average test sets, indicateonly the condition of the filamentand can not be depended upon as atest of the detector sensitivity.For that reason the best practicaltest for the tube is a check of theoperation obtained under actual ser-vice conditions in a receiver, witha weak incoming signal being pre-ferred. Quick test during the firstminute of warm up will usually suf-fice, but if any doubt as to thesatisfactory performance of the tubearises, it should be allowed to warmup the full three minutes before at-tempting to complete the test.

A plate current reading obtainedwith this tube when used in a radioreceiving set with a grid condenserand a grid leak is quite differentthan that obtained in a test set.Under usual conditions the platecurrent is approximately 1 MA, vary-ing only slightly from this valueregardless which side of the fila-ment the grid is connected. Thedifference in reading as comparedwith those obtained in a test setis due to the fact that the gridcurrent furnished by this tube issufficient to establish a voltagedrop in the grid leak equivalent

to the use of a grid bias voltageof 2 to 21 volts.

Under certain conditions a hissis produced at the time the platecurrent noted in the preceedingparagraph occurs. If a milliamperemeter is placed in a detector platecircuit, it will be noted that theinitial reading is about 1 MA re-maining at this value for the firstminute, while during the secondminute the plate current risesslowly to 2 or even 3 MA. It isduring this change that the hisssometimes occurs. The plate currentthen returns to a value close tothe initial value and then the tubewill operate quitely.

There are several reasons for nottesting these tubes at voltages nohigher than 45 volts, first it doesnot represent the operating condit-ions of the tube, secondly the gridbiasing voltages are often appliedwhen testing at higher voltages. Be-cause of the amplification constantof the tube the plate current willbe practically blocked at 90 voltson the plate, if the ordinary vol-tage of minus 4 volts is appliedto the grid, the reading will beonly a fraction of a milliampere.

When a test of the filament con-ditions and the short test only isdesired, the readings from the or-dinary tube test wet will be foundsatisfactory. A sample reading us-ing a detector tube 300A at a fil-ament voltage of 5 volts and a platevoltage of 45 volts. During thefirst minute of warm up the platedrew 1.6 MA with the grid connect-ed to the minus side of the filamentand 6.1 MA with it connected to thepositive side of the filament.After the three minute warm up theplate drew 2.1 MA with the grid con-nected to the minus side of the fil-ament and 6.2 MA when the grid wasconnected to the positive side ofthe filament. These drastic changesin plate current are due to the for-mation of the alkali vapor in thedetector tubes. The detector tubesare the only tubes required to warmup such a long period of time inorder to make the various emissiontest we have been speaking of inthe previous paragraphs.REACTIVATING POWER TUBES -- The pow-er tubes such as the 203A, 204A, 210,211, 213, 216B and the 852 can bereactivated only if they have thethoriated tungsten filament. Onthese tubes the flashing voltages istwice the rated voltage and shouldnot be applied over fifteen seconds.The reactivating voltages are only20% higher than the rated voltagefor the filament. The time requiredfor reactivating is two to fifteenminutes. If the emission is not upto the rated value then the tubehas run its normal life.

If you readers have access tosome of the old radio books you canfind interesting reading on the artof rejuvenation of the vacuum tubes.As a referience I have used a book

titled 'the Radio Manual' by GeorgeE. Sterling published in 1926, Ihope you have gained knowledge fromthis article and can use it insearch for better operation of yourradio relics.

0. H. McDonald is a collector ofvintage radios and apparatus. Inthe mid 40s he was instructor ofclasses on the theory of basicradio and electricity.

ARTClassified ad rate: 6¢ per word.

Photo ads: ;',2.00 extra.

MISC.NEW ENGLAND COLLECTORS. At last enAntique Radio Club for east coastcollectors. For full information andapplication write to: President -Bristol Antique Radio Klub, John D.Alley, 48 Judson Street, Raynham,Mass. 02767.

WE CAN PROVIDE RESTORATION SERVICE,old radio schematics, parts andradios. Write for information.Olde Tyme Radio Co., 2445 Lyttons-ville Rd., Silver Spring, MD 20910.

CUSTOM TAPING: 20,000 pre 1.90 re-cords including Edisons. Discs 25¢per record side, cylinders 50¢,plus cost of tape; cassette or 4track reel. Anton Johannes, RD 1,

Box 285, Wallkill, W.Y. 12589.

FOR SALE OR TRADEFOR SALE: Authentic reprints ofGrebe sales brochure covering theCR -3, CR -5, CR -8, CR -9, RORD & RORK,

á2.25 post paid. Also companionGrebe Instruction Book with hook-ups,graphs and schematics of the CR -3,CR -5, CR -8, CR -9, RORD, RORK & RORN,13.95 post paid. Send check or MO toDonald 0. Patterson, 1220 Meigs St.,Augusta, Georgia 30904.

BLANK BAKELITE STOCK cut to size,1/8" to 1/2" thick. Fabricatingand engraving services available.SASE for pricing sheet.Norman A. Parsons, 22 Forest St.,

Branford CT 06405, Phone: 203

488-4267.

WD1) Adaptors, use UX199, 120, VT24.No wiring changes, Radiola III'sbattery hook-up included $5.25pp-,2 for X9.25 Keith Parry, 17557Horace St., Granada Hills CA 91344.

FOR SALE OR TRADE: Early QST's, CQ's,Radio, call books, handbooks, tubularAudiotrons, Electron relays and earlyreceivers & parts. Ery Rasmussen,W6YPM, 164 Lowell St., Redwood City,California 94062.

FOR SALE: Battery radios of 1920'svintage, tubes, phones, speakers,parts, accessories, early test gearetc., early electric sets. SASE forlist. F. C. Haas, 207 West 30,Hutchinson KS 67501.

The HORN SPEAKER,,... 9820 Silver Meadow Drive, Dallas, Texas 75217 7

FOR SALE OR TRADE

FOR SALE: Old wall telephone,Central Telephone & Electric Co.,St0 Louis MO. Has nicely nickelplated magnets but needs receiverand bells need plating, also haveold desk phone with poor receiver.Will sell to best offer. I need AKspeaker model E2 or E3. Hugh E.Kuhn, Rt3, Lime Springs, Iowa 5215.Phone: 319 5117-21498.

FOR SALE: Best offers on WorldWar I portable spark coil transmit-ter. Looks nice and working.Crocker Wheeler 5 piece add a unit'with CR earphones one tuner coilmissing. Looks good. SASE please.Steve Sideroff, RFD 1, Marlboro,New Jersey 077116.

LOWEST PRICES on recording tape.Reel to reel, used, professionallyerased and spliced. 600' (or more)on 5" reel "=1.00. Ten reels $7.50.Add .50 per order for shipping.Satisfaction guaranteed. BruceElving, Adolph MN 55701.

TRADE: Have Crosley Pup w/12 tube fordown payment on AN 5 or 12 or B.O.Also for sale or trade a Howe and aRadionette crystal set. W. Harder,911 Northrup W., Lansing, Mich. 118910

FOR SALE: Very primitive appearance,Weston Model #537, radio set testerand tube checker Circa 1926, :;;60.00postpaid. Puett Electronics, P.Q.Box 28572, Dallas TX 75228.

FOR SALE OR TRADE

A.dTIQUE TEIEVISION Collection: 38different models from 1930s, 1940sone or all $75.00 up each. List &picture $1.00. Seidel, 6111 GroveLane, Santa Barbara CA 93105.Phone; 805 687-7967. Want horn phono-graphs any quanity CASH.

CLOTH COVERED POWER CORD. New 2 -con-

ductor cord as used on AC sets ofthe twenties, thirties, forties.From old stock, limited quantity.In brown or gold 25¢/foot. Please

add 50¢ for mailing. Warren Dewey,5021 Ambrose Ave., Los Angeles,California 90027.

BROADCAST BAND DX STILL LIVES!. For more information and a free

sample bulletin, Please write TheInternational Radio Club of America,P.O. Box 21462A, Seattle, Wash. 98111.

FOR SALE OR TRADE: 2 Federal F 10radios; Crosley 550; FADA neutrodynekit set; Hudson Symphonic Six; Mag-navox R 3 Horn; Crosley DynaconeSpeaker; less tubes, all work. F.O.B.SASE for details. Herb. DeGarmo,Early, Towa 50535 Phone; 712 273-3571.

SPÉAKER GRILLE CLOTH. Two newstyles now available. (Styles#1, 2, 3 sold out.) Fine, silky20's - 30's style fabric. 24"wide 111.00/yard, plus 25¢ mail-ing. SASE for samples. WarrenDewey, 5021 Ambrose Ave., LosAngeles CA 90027.

FOR SALE: Must clean up Radio Shack.All kinds of old parts never used andO.K. repaired B.C. sets and surplustransmitting & receiving parts. Mustpick up or call or write for infor-mation. G. Jacobson, K2ERV, 6706 -21st Ave., Brooklyn NY 112011.

TRADE OR SATE: Deforest Audion nameplates and 90° dial plates. (Re-plicas - well made.) Wm. W. Wilson,1108 Oak Manor Dr., Fairfax CA 911930.

FOR SALE: Battery and electric radios.D. Anderson, 607 Ridgebury Rd.,Ridgefield CT 06877.

IOWA COLLECTOR: Iowa -manufacturedreceiver, Standard Radiophone CompanyT.R.F., for sale, 4:115. Art Harrison,1021 Falcon Dr., Columbia MO 65201.

SASE for list of radios, tubes, malts.,catalogs, parts, etc. Cecil Bounds,Pine Springs Rte., Carlsbad N.M.88220.

WILL TRADE Columbia Q cylinder phono-graph for Magnavox 21" horn speaker,must be original and working.Bill Wiley, 282 Highland Ave.,Wadsworth, Ohio 1111281.

WANTEDWANTED: Primary coil, secondary coil,tickler coil (box), and crystal de-tector all exact types used withcrystal detector receiver like Nat-ional Electric Supply Co., ModelCN239 (p64, Vintage Radio) but pro-bably 1916 model. Robert Meisenholder,13900 S.E. With Place, Bellevue, Wash.,

98006.

WANTED For Scott Allwave 12 doubledial tuning; Need the dial assembly,comprising dial drum, alluminumframe, tuning knob shaft and pullies.Ralph G. Maddox, Purgitsville, W. VA26852.

JOHN GRIFFIN WANTS TO BUY pre -1930battery operated radios. Must be inchoice condition. Send photo, price,and phone number. Photos returned ifno deal is made. 2937 W. IndianSchool Road, Phoenix, Arizona 85017.602-263-7658.

WANTED: Early battery and/or ACradios, equipment and parts forsmall private collection. Describeand give best price. Leland Smith,WSKL, Route #3, Jasper AR 72641.

WANTED: National SW -3, old tubes210, 203A, 2011A and other vintagetransmitter parts. Fenton Wood,3122 Ann Arbor, Sugar Land, Texas

77!178.

WANTEDWAN1ED : Cabinet for Federal 59.Would consider good replica. Alsolooking for any Marconi items.Have Edison gold molded cylinderrecords - 2 minute - for sale -

make offer. Pat Stewart, W7GVC,111011 Ruth, Walla Walla, Wash. 99362.

WANTED: Base for AK type "L" hornspeaker. Also need AF transformer forWells Manufacturing Co. "ArlingtonReciever." Want Magnavox TRF - 50 andWestinghouse Aeroila Sr.Electric radios for sale or trade.SASE for list. D. Dazer, 2989 Maywood,Port Huron MI 48060.

WANTED: Accuratune dials large andsmall, Radiola blanced amp outputtransformer, and WDlls, Crosley 601Gembox parts. Graham Neilson, 72 OldMill Rd., Toronto, Ontario M8X1G8,Canada.

WANTED: Case for Radiola III. Tubesocket for WD -11. Diagram for Ster-ling tribe tester Model R-509. Selltubes of all types. W. Childress,1220 W. 71st Place, Chicago, Ill.60636.

WANTED. Bristol 1924 1 -dial reflex.Have Kennedy XV, Aerola Sr, andothers for trade. Art Harrison,1021 Falcon Dr., Columbia MO 65201.

WANTED: Old magazine Radio News,Radio Broadcast, Popular Radio Short-wave Craft 192$ thru 1932.L. P. Rayner, 5512 N. 71st. Place,Scottsdale, Ariz. 85251.

WANTED: Any radio fan magazines.Also, any radio magazine with com-mercial broadcast or star informat-ion. Examples --Radio Guide, RadioStars, Radio -TV Mirror, etc. AlsoPhotoplay magazines. 1 or a 100.Fred L. Davis, 5106 Skippy Street,Memphis, Tennessee 38116.

PHONOGRAPHS WANTED - All types (parts)needle tins, boxes, envelopes, counterdisplays, signs, posters, catalogs,Victor Dogs, etc. Have parts; repairmany machines. Jerry Madsen, 8115Emerson South, Minneapolis, Minn.551120. Phone: 612 888-9767.

WANTED: Radio Magazine - all 1920-1921,Radio Broadcast - Nov. 1926, Dec. 1928,Many Wireless Age 1921 to 1925. Buyor trade. Thompson, 2930 Delavina St.,Santa Barbara CA 93105.

WANTED: Crystal sets, battery andelectric radios and televisions Mfg.before 1935. Need all related items.Will buy one set or complete collect-ion. Young, 11 Willow Court, Totowa,New Jersey 07512.

WANTED: Beginning collector interest-ed in your duplicates, crystal sets,early radios, horn speakers, etc.Any condition. Troe, 111 Skyline Dr.Morristown, New Jersey 07960.

WANTED UNASSEMBLED KIT radio inoriginal box. Boxed parts of anykind. Sets, parts, books, mag-azines of the 1920s. W6ME, 4178Chasin St., Oceanside CA 920511.

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R(1) Make checks and money orders payable to PUETT ELECTRONICS.

(2) Please state whether new or half-price used tubes are desired and

whether a used tube may be substituted when a new tube is out of

stock.

REFUNDS are mailed with your invoice for out -of -stock tubes,

or when, by customer request, a used tube is substituted for an out -

of -stock new tube.

(3) WE SHIP PARCEL POST.

NO C.O.D.

INCLUDE 15% POSTAGE & HANDLING PLUS

300 INSURANCE.

TEXAS RESIDENTS ADD 5% STATE SALES TAX.

MINIMUM ORDER $3.00 - does not apply to schematic diagrams or lists.

CUSTOMER SATISFACTION GUARANTEED - If you are not satisfied with your

order for any reason, tubes may be returned within ten days for refund or

replacement with exception of tubes which are shorted or have open

filaments.

It will be assumed that returned tubes with open filaments or

shorts were damaged in shipment.

Shipping damage claims will be handled

promptly through the post office on insured orders.

PUETT ELECTRONICS

assumes no liability for orders which are not insured, and no liability

beyond that which is covered by postal insurance.

ALL TUBES ARE

THOROUGHLY TESTED ON A MUTUAL CONDUCTANCE TUBE CHECKER BEFORE SHIPMENT.

'SCHEMATIC DIAGRAMS'

WE CAN FURNISH SJHSil.TIC DIAGRAMS

AND TECHNNICAL DATA ON ALMOST ALT

RADIO FROM 1920 TO 1954 FROM OUR

LIBRARY OF uEIOl:iAL IIaNU?ACTURERS

SERVICE DATA.

Send $1.50 and one

131 stamp per radio net.

This

offer is limited to five photo-

copied pages.

If the data you

seek exceeds five pages, we will

send you a quote.

BE SURE TO

STATE MANUFACTURER'S NAME AND

MODEL NUMBER.

TUBE TYPES OlA. 99 Sy WD -11 etc.

We sometimes have these tubes in

stock in limited quantities.

Send a 130 stamp for our latest

New Acquisitions List.

BALLAST T9HS - We can supply many

types of bllaen tubes or their

equivalent,.

Send 520 in stamps

for our Catalog Section.

OLD RADIO TECHNICAL BOOKS

Send 130 stamp for our

New Acquisitions List.

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SAMPLE OF OUR CLASSIC

RADIO NEWSLETTER - SIX

ISSUES PER YEAR - FOUR

OR MORE PAGES PER ISSUE.

THE PUETT ELECTRONICS

SUPER A!.TENNA - GROUND SYSTEM

For antique radios and short wave

listening, higo gain, takes up very

little space, omni-directional,

tested 4 proven - plans $2. post pd.

LIST OF ANTIQUE RADIO SERVICES

Over 80 sources for services, parts,

tubes & Data - $1.50 plus 130 stamp.

TUBE TYPES AND PRICES -- Prices listed for new tubes - used tubes, when available, are half the new tube price.

0A2

2.

0A3

2.

0A4

2.

OB3

2.

0C3

2.

OD3

2.

OT4

3.

014

2.

lA1

5.

143

3.

lA4

3.

1A5

3.

IA6

3.

1A7

3.

1B4

1B5

1B7

1B8

1C1

4.

105

3.

106

3.

1C7

5.

1D5

5.

1D7

5.

1D8

4.

1021

3.

1E5

5.

1E7

4.

1F4

4.

175

4.

176

4.

177

5.

104

4.

105

4.

106

4.

1N4

5.

1H5

3.

1J6

4.

114

4.

116

6

1LA4

4.

1LA6

4.

1LB4

4.

1LC5

5.

1LC6

4.

1LD5

4. 3.

3.

3.

3.

ILE3

1173

1105

1LH4

1LN5

1N5

1N6

1P5

1QS

1R5

154

1T4

1T5

1U4

1U5

lV

2A3

2A4

2A5

2A6

2A7

2B7

2C26

2E5

2E30

2V3

2W3

2X2

3A4

3A5

3A8

306

3LF4

344

3Q5

3S4

5A24

5R4

5T4

5U4

5V6

5W4

5X4

513

4.4.

4.4.

4.

4.4.4.4.

2.

2.

3.

3.3.

3.

6.

5.

3.

3.

2.4.

4.

4.2.

3.3.

3.3.

5.

3.

3.

2.4.

2.2.2.2.2.2.

3.

514

523

624

A3

6A4

6A5

6A6

6Á8

6AB4

6AB7

6AC5

6AC7

6AG7

6AK5

6ÁL5

6AL7

6AQ5

6AQ7

6A57

6AT6

2.

6AI16

2.

6AV5

2.

6AV6

2.

6AX5

2.

684

5.

6B6685

5.

6B7

5.

688

3.

68A6

2.

68E6

3.

6BJ6

2.

6C4

2.

6C5

3.

6C6

3.

6C7

608

4.

6Cff6

2.

606

4.

607

4.

608

4.

6E5

4.

6E6

4.

6E7

4.

6F5

3. 3.

3.

3.

5.6.4.

4.5.

3.

3.

3.

3.

3.

2.

2.

3.4.

2.4.3.

6F6

6F7

6F8

605

606

6H6

6J5

6J66J8

6K5

6K6

6x8

615

616

6B5

6N6

6N7

6Q7

6R7

654

648

6SA7

6SC7

6SD7

6SF5

6877

6S G7

6SH7

6SJ7

63K7

6SL7

6SN7

`6SQ7

6S R7

6SS7

6ST7

6SU7

6sv7

6T7

6T8

6U6

3.6.3.

4.

3.323.3.3.

3.3.

3.

4.3.3.4.

3.3.3.3.

4.

4.

3.

3.

23.

13. 3.

3.

3.

3.

3.

3.

3.2.

3.

3.

13. 3.

3.

3.4.2.

4.3.

6U7

6V6

6V7

6W6

6X4

6X5

6Y5

6Y6

617

625

627

6215

7A4

7A5

7A6

7A7

7A8

7AE7

7AF7

7AG7

784

785

7B6

7B7

788

7C5

7C6

7C7

7E1,

7E7

777

778

7G7

7H7

737

7K7

717

7N7

7Q7

7R7

7S7

777

7X6

717

714

$4.2.4.3.

22.

3.

134.3...

13.3.3.

3.

3.4.

4.4.

3.

3.

3.4.4.

3.

3.

3.

3.3.4.

3.3.3.3.3.

3.

3.

3.

7Z4

10

12A5

12A6

12A7

12A8

12AH7

12AT6

12AT7

1.2AU6

12AU7

12AV6

12AX7

1287

12B8

12BA6

1213E6

12C5

1206

1275

12H6

12J5

1237

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23.

4.

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PHOTOGRAPHS - SCHEMATIC OIAGRAMS-STORIES

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MA

Y75c

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TH

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DAYS

Major -General James G. Harbord, President of the Radio Corporation of America, was much interested in the German

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1923

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