TELEGRAM AND EVENING MAIL RADIO

Vo1.VII No.3 March 1978 Monthly except during July and August Price !15..r.,0 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 VINTAGE

;'HE HORN SP

ELECTRONICS AND SOUND

Mystery Taken Out ofDe Forest

Weagant's Pet Complete and PowerfulBy E. A. LIVINGSTONE;, M. E.,(Technical Director, De Forest Radio Institute.)THE latest De Forest creation has

drawn such widespread attentiontnrough its consistent performance thatmany "fans" may wish to know some-thing about the circuit used and otherthings pertaining to its operation. In or-der to take the "mystery" out of radio-when not addressing a body of engineers-it is the writer's custom to use the sim-plest terms possible. And, therefore, indescribing the D-17 circuit in the spaceavailable, he will attempt to avoid a tech-nical dissertation. Most "fans" are ac-quainted, with the terms used and thefunctions of the various parts.

The De Forrest D-17 is an entirely self-contained 5 -tube receiving set, designedfor loop reception, with a wave lengthrange of 220 to 550 meters.

From the schematic diagram it will beseen that the circuit consists of two stagesof tuned radio frequency amplification,one stage of untuned or "transformercoupled" radio frequency amplification,and two stages of audio frequency amplifi-and two stages of audio freqency amplifi-cation, the first of which is reflexedthrough the third radio frequency tube.

The incoming signal is intercepted bythe loop which is inserted in the jack, orby the antenna under circumstances whichwill be referred to' later. The specialfolding loop has sixteen turns. A switch isprovided to cut out five turns for effi-cient reception of wave lengths below 400meters. The .0005 mfd. variable condensertunes the loop and the grid or input ofthe first radio frequency tube. The am-plified energyepaeses through the primaryof the tuned radio frequency transformerand is transferred by electromagnetic in-duction to the secondary winding, whichis tuned by the .0005 mfd. variable con-denser, whence it is impressed on the gridof the second radio frequency tube. Thefurther amplified energy now passes tothe primary of the fixed or untuned radiofrequency transformer, and is transferredby induction to the secondary coil, whenceit is impressed on the grid of the thirdtube. The still further amplified energyis passed on through fixed transformerto the detector tube, where it is rectifiedor changed ipte ,an audio frequency cur-rent. The audio frequency energy nowpasses to the primary of audio frequency

transformer (which is of 5-1 ratio), andis transferred by induction to the seconda-ry, whence it is applied to the grid of thethird tube by flowing through the sec-ondary winding of fixed transformer.

Third Tube Reflexed.It will now be seen that this third tube

is the "reflexed" tube which acts as boththe third radio frequency and the firstaudio frequency amplifier. From theplate or output of tube the amplified cur-rent flows through the primary windingof the second fixed transformer to theprimary of the second audio frequencytransformer (which is of 3.5-1 ratio),thence by induction to the secondary andon to the grid of the fifth tube, which isthe second audio frequency amplifier.From the output of tube th_ greatly am-plified current passes to the built-in loudspeaker, where it is converted into anaudible signal of great volume.

It will be noted that a jack is providedat this point for the use of headphones oran external loud speaker, the internalloud speaker being automatically cut outof the circuit on insertion of a phone plug.By-pass condensers of .0001 mfd. capacityare shunted across the primary and sec-ondary of A. F. transformer, and thesecondary of A. F. transformer.

The copper shield around the'tunedradio frequency transformer, the coresof the two audio frequency transformersand the frame of the loud speaker aregrounded to the shield of the set.

The grid bias of the first and secondR. F. tubes is controlled by the 500 ohmpotentiometer, which is marked "Sen-

Publisher. Jim Cranshaw

214-286-1673

set,{alt(rduy, i1ttrvk 21, 1925.

The reran and his work. Roy A. Weagant, famous designing engineer, looksover his newest pet, the De Forest D -17-M.

si:ivity" on the panel of the set.One Rheostat Control.

The filament current of all five tubes iscontrolled by the 10 ohm rheostat. It willbe noted, however, that a fixed resistancewith a movable "juniper" is placed inthe filament circuit of the detector tubeThe purpose of this resistance is to permitthe use of a De Forest DV -3 dry cell tubeas a detector when using De Forest DV -2

storage battery tubes as ait:plifiers. IfDV -2 tubes or DV -3 tubes, as the casemay be, are used in all five sockets, the"jumper" is swing around to make contactwith two binding posts, thus short-circuit-ing the resistance. This little "jumper" isconveniently located at the right of thedetector tube just behind the panel, andcan quickly and easily be adjusted to therequired position without the use of tools.

STATIONARYPLATES

!$TATIONARV

PLATES

k002-O .BBAT.«i7LJ - t fA"BAT - DELi AMP.t

2 ME6OHM8

NOTE: S.-- SHIELD

Complete circuit diagram of the Live -tube De Forest ref lex receiver with three stages of tuned radio frequency,detector, one stage of reflexed A. F. and one stage of straight A. F.

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

The four amplifier tubes are located tothe rear of the detector tube, all socketsbeing amplycnshioned. While the diagramshows the radio .frequency tubes at theleft, in the manufactured set the firstright hand tube is the first R. F. tube, thesecond is the second R. F. tube, the thirdis the reflexed tube, and the fourth or left-hand tube is the second audio tube.

The shielded tuned R. F. transformer islocated to the rear of the set, the twofixed transformers on a hakelite sub -base-which also contains the loop jack-between the detector and amplifier tubes,and the A. F. transformer are immedi-ately below the cushioned sub -base whichsupports the detector tube.

The built-in loud speaker will be foundat the rear of the set, the unit being soplaced that adjustment of the diaphragmis easily and quickly effected by turninga small lever. A wooden projector of spe-cial design carries true reproduction ofthe sounds transmitted from the stationwith ample volume to the listeners throughan artistic grill just below the panel.

Two battery compartments are provided,the left hand one being for the speciallydesigned storage battery, or regular drycells, and the right hand one for the 90volts of "B" battery. Four heavy duty22% volt units, of the order of No. 2,158Burgess, are recommended :as being the

most economical. Three of fiibatteriesare placed vertically in the compartmentand the fourth horizontally bn'.top of theother three.

Layout Compact.

The whole Iayout is wonderfully com-pact, and the workmanship and efficiencyof the set are unexcelled. The De ForestD-17 Radiophone is extremely sensitiveand selective, and easy to operate. Thetwo tuning pointers. which are actuatedby friction drive reduction gearing, giverazor -edge control and can be logged.

Although the De Forest D-17 is designedfor efficient loop reception under all nor-mal conditions, there are occasions onwhich an external antenna and ground, inaddition to the loop, may be used withadvantage. This applies chiefly to thosecases where the receiver is located in ashielded building, or when Brother DXHound wants extreme distance on the loudspeaker.

The first step in tuning the D-17 is toset the filament pointer. When usingDV -2 (storage battery type) tubes as am-plifiers, turn filament pointer to approx-imately nine. When using DV -3 tubes asamplifiers turn filament pointer to ap-proximately three.

When this pointer is once set-for sayan evening's use-leave it alone, as it isnot intended to be used for tuning. Onsucceeding evenings you may, however,have to use it in a slightly advanced posi-tion, due to the batteries running downthrough use.

' A "rough and ready" way to tune instrong local stations is to next set thesensitivity pointer at about five, then usingbotie hands, move the amplifier and re-ceiver tuning pointers back and forth untila station is heard, after which the sensi-tivity pointer as well as the two tuningpointers should each be adjusted one wayor the other to get best results:

In reaching out for weaker more distantstations, or picking out a particular one,much more care and patience is required.First, set the sensitivity pointer at aboutsix or seven. Now-with the left handswing amplifier pointer back and forthfrom zero to twenty, while at the sametime the receiver pointer is being steadilybut very slowly moved from zero totwenty with the right hand.

If while doing this you hear a bird -likechirp or whistle, you will know that youare on the "carrier wave" of a broadcast-ing station. This whistle rises and fallsin pitch as you slowly swing the pointersand is thus easily distinguished from other

sounds.

When you first pick up the chirpingsound, stop moving the receiver pointer.

CAá \J a.Coñttnue swinging .lie amplif er pointerback and forth past the chirping point,and, at the same time, slowly move thesensitivity pointer to the left until thechirping just stops.

If no carrier wave is picked up duringthis procedure in moving the receiverpointer from zero to twenty, the re-mainder of the sca a should be explored.Do this by moving the receiver pointersteadily but very slowly to the right withthe right hand, while swinging the am-plifier pointer back and forth ten orfifteen points to either side of a pointcorresponding to the position of the re-ceiver- pointer.

After receiver pointer has passed forty-five and into the range of the higherwave lengths, the sensitivity pointershould be turned clear over to "Max."When you leave one station and startsearching for another, do not forget torestore the sensitivity pointer to the

roper starting point.

THE SUN RADIO SECTION, SATURDAY, APRIL 4, 1925.

Loud SpedA column or two for the Radio Fin: a place

for his achievements end experiences; a friendlycorner for the settlement of friendly arguments.

Conducted by MOE D. ENTLER.

IT would be a good move for theexperimenter to construct ashort wave receiver, because

with such stations as KDKA, WGY,KFKX add the Radio Corporation'sspecial station at Belfast, Me., trans-mitting on short waves, there isbound to be some fascination In pick-ing them up on the lower waves.

The radio fan who is acquaintedwith the 'code can also experience thethrill of picking up some amateurtransmitting from a great distance.It has been said -that short waveswill travel a greater distance thanthe higher waves, making it quiteinteresting to -experiment with sucha receiver to really determine whethersuckle the case.

One obstacle must be overcome toinsure good reception on the lowerwaves, and that is to do away withthe static that becomes much moreannoying at this point than whilelistening in to high wave stations.In the event of many more broad-casting stations being pressed intoservice, it is probable that they willbe -assigned low wave lengths andthereby making the short wave re-ceiver essential.

Good DX.One glance at the many DX rec-

ords received by the Loud Speakerduring the last few week& will readilyconvince one that the distant sta-tions are coming through in goodshape.

Many writers claim that they areable to tune In all sorts of stationswhile the locals are on. making itappear that Static has not yet begunto reign.

Takes Exception."I read in your issue of March 28

where A. Fringes took J. B. Green-man to task for recommending a si-lent night, and advocated instead thebuilding of a super set like his.Now don't you think it is about timeyou established a censorship in yourcolumn? To quote A. Fringes, hereceives the following stations be-tween the hours of 7 and 11 P. M.while the locals are going full blaston the loud speaker: WOS, transmit-ting on a wave length of 441 meterswhile- WJZ la on, fourteen metersapart; CNRO, 435 meters, whileWJZ, 455, is on, twenty metersapart; WLW, 422 meters, whileWJY is on. seventeen meters apart.

"The seasoned radio fan knows thisis bunk, and that while it la possibleto penetrate through the lower wavelengths, where a point on the dialswill kill a station, it is next to im-possible to penetrate through thehigher wave lengths, where it takesfive to eight points on the dial

"The prime purpose of this letteris to advocate a silent night I havea log of fifty-three stations, also of-ficial confirmation of PTT, Madrid,Spain, which I don't believe to beauthentic myself, as I believe Iheard CYL; Mexico city, instead.

"I hope this letter finds its wayinto the columns of the Loud Speak-er, as I am beginning to believe thatradio is getting to be in a class withfishing."

The writer of the above letter isEdward Kane.

Static Eliminator."Please don't intdrpret this as a

boost for QBT, but in regard to yourrequest for anti,static devices I wishto call your attention to the Febru-ary and March issues of QST,wherein are described the McCaaanti -static devices, which seem to bethe best attempts so far. In caseyou haven't read these issues, thestatic preventers are in the form of avacuum tube repeater, which limitsthe loudest crashes to the same au-dibility as the signal. Although asignal static ratio does not soundvery promising, it is in reality farsuperior to any present '-- 'staticprovention method.

"The device works best on a non -regenerative radio frequency re-ceiver, which ought to make themvery popular, and, in addition, iseasily constructed and compact. Anassembled preventer greatly resem-bles a stage of tuned R. F. in ap-pearance, with no cumbrous loops.

"It seems that every one is in-terested in short waves these days,so I will give my experiences withsame, In November, 1923, I built myfirst low loss short wave set, nearlysix months before the present lowloss craze began. During the ama-teur transatlantic tests I was réwarded by hearing one Britisher,2NM, on this set.

"My present set consists of thefollowing: An. eleven turn secondaryof No. 16 D. C. wire, prirtiary of oneand three-quarter turns No. 12 wireand a tickler of ten turns No. 20 D.C. wire. The secondary is tunedwith a .00025 Bremer -Tully conden-ser, giving a range of about 44 to130 meters. Although the set is sen-sitive, which is proven by the factthat I repeatedly hear Sixth Districtamateurs, station KDKA comes inon sixty-three meters, but withoutloud speaker volume. Still they comethrough with remarkable steadiness,day or night, and r ith only one stepof audio frequent.:, will comfortablyfill a small room.

"A hundred foot antenna is usedand several different methods of con-necting it have been tried. First a

one and three-quarter turn primaryabout two inches from the secondaryin a regular Ambassador type cir-cuit; second, a single circuit, withthe capacity between the grid andground omitted. This method ispractical only when the battery leadsare very short and the set well re-movc:l, from radiators and waterpipes, otherwise` the receiver willfail. to oscillate, . the capacity to theground being too great. In this thirdcase the capacity of the batteries tothe ground acts as a ground seriescondenser.

"Another interesting feature ofshort wave experimentation is thatthe aerial and ground don't have tobe connected to the set, but onlyplaced in the vicinity, because atsuch great frequencies the currentbridges extremely minute capacitieswith ease.

"In a test, while 6CTO was beingreceived, first the ground and thenthe antenna was removed. The sig-nals were somewhat weakened, butstill remained readable. 6010, bythe way, le either In California orArizona."

The above letter of interest comesfront W. W. Pratt of East Orange,N. J.

In One Night."After reading some of the DX

records in the Loud Speaker sectionof last Selurday, I would like to tellypu of ni)' reception on Saturdaynight, March 22, from 9 P. M. to2:15 A. M.

"My set is of the three circuittuner type operating on an indooraerial. Besides tuning in the localsI was afile tb tune in the followingstations, WCAD, KDKA, WBZ,WLIT, WIP, CNRO, WJJD, WGY,WREO, KYW, WLS, WGN, WQJ,WEBH, WPG, WCEE, WSAI,WTAM, WOC, WCCO, _ WCAL,ZYDAF, WMBF, WOAW, WFAA,KOA cud KHJ.

"I have 'EKKO' proof of recep-tion stamps, previously receivedfrom ninety-eight stations, includ-ing KFI, Los Angeles; PWX, Ha-vana, and KOA, Denver.

"I have never used anything but

an Indoor aerial and have heard asfar as Denver without any aerial atall."

Carroll A. Lovering is the fanwho accomplishedf such wonderfulDX work in an evening.

Thinks His Best.William Shapiro writes that since

he has not seen a record in theLoud Speaker columns as good ashis, he will set a challenge for anyone to produce a log as good as his.

On a one tube set he claims tohave picked up KFI, KGO, WBAP,WFAA, KFRU, CNRW, 6KW,KFKX, WCAL, WHB, WDAF, WOS,WHO, WOAW, KFNF, WFAV,KSAC, WOCO, WOL I B,WMBF and WQAM. He has veri-fications from both KGO and KFI.

Using absolutely no aerial, only aground wire ten feet long, he haspicked up the following stations:KOA, KFRtY, KFKX, WMBF, WEB,WDAF, WLS, WEBH, WGN,WBON, WTAS, WCCBD, WJJD,WTAY and WOEE. He thinks thatthis in Itself is a good record. Helay stress on the fact that he coulddo much better work if his set wouldtune above four hundred and thirtymeters without en aeriaL

777:E,a9.90v74R71CLo K/VPCOLUMN WZR1E,aON#47F-1, BYARTHUJRSE~$Rd/YX Il.1W YORK

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

The clOPerts .-

Reflex `Deceiver

BE1'TER reception is theone great desire ofevery member of the

large family of radio fans whonightly turn their dials insearch of ether -borne enter-tainment. Better receptionis the allurement that causesthousands of fans to constructone set after another and, afterexperimenting with each onefor a time, dismantle it anduse the parts to build anotherwith which he hopes to ob-tain greater range, increasedselectivity, improved tonequality and perhaps morevolume. These features, com-bined with low original costand a minimum upkeep ex-pense, may be said to char-acterize the perfect radio re-ceiver.

The one to be described here is neitherthe ultimate nor the perfect receiver forwhich a multitude of fans have thus farsought in vain, but it does combine moredesirable features than any other home-made set known to the writer at the pres-ent time. It was developed by WalterVan B. Roberts, of Princeton.

It combines tuned radio frequency withregeneration capacity neutralization andreflexed audio -frequency amplification. Itdoes not radiate howls and squeals, andits tone quality is excellent. It is selec-tive, sensitive and requires but two tubes.Additional tubes may be added for in-creased volume, if desired, but the nucleusof the set consists of the two tubes con-nected as shown in the accompanying dia-grams.

THE COUNTRY GENTLEMAN

-4 :lr. '41'.

il.tandery

L 1

I

)11'44

.000ambi rana nrtrAudio TrreeyyrrrrvrxyTrena/ortner

4CBaétery

77¡w/Ñ114',''

Rh a.rs.2Sel/arf n>ls

3

eratuAc

/jruaa rod !ci-cvr.+ri-prrl/ tik6-rconr,r1 \

m«

L

có5,.r'.

6rrdCv rendm;,pdd ndouen

Deteler

o

'1 L\Si

Phew -at

To ncód'Gcro'om' . 6. _ .

6- 6- A *A +B22 45 +890

I2obe t3 Reflex Receiver

am/.aier ame

Jou//,-circuit 5,s*

Input

Tube `Does `Double Duty

The first tube functions both as radioand audio frequency amplifier, whereasthe second serves as a detector. To thismay be added push-pull or resistance -coupled amplification. Straight audiofrequency is not recommended. Thehook-up shown herewith, in connectionwith two stages of push-pull amplification,results in an exceedingly efficient four -tube set which is comparatively simpleto construct and which produces volumeequal to many five -tube receivers.

The following parts will be required:2 Vacuum tubes.2 Sockets.1 Rheostat.1 Rheostat or ballast resistor-resistance de-

pendent upon tubes used and filamentvoltage.

1 Double -circuit jack.2 Variable condensers .0005 mfd.2 Vernier dials.1 Audio transformer, 5-1 ratio or less.1 Tap switch.5 Spider -web forms-see text.1 Neutralizing condenser-see text.1 Grid leak, preferably variable.1 Grid condenser .00025 mfd.3 Fixed condensers-.001, .005 and .0025 mfd.1 4% -volt C battery.yy Pound No. 22 d. c. c. wire.

Pound No. 26 d. c. c. wire.y Pound No. 26 green -silk -covered wire.1 Panel, 7x21x3-16 inches.1 baseboard, 21x10x% inches.20 Feet bus wire.1 Filament switch.5 Binding posts, also wood and brass screws.

In addition to the above, two smallstrips of wood or insulating material1x6x3-16 inches will be needed for sup-porting the spider -web coils.

Coils especially designed for use in theRoberts receiver are now available on themarket and their use will insure perfectresults; however, constructional detailswill be given for those who wish to windtheir own.

Fans who have access to a ten -centstore can obtain the fiber spider -webforms; otherwise, the drawing accompany-ing this article may be used as a patternby pasting it to a piece of heavy cardboard

A SIMPLY CONSTRUCTED SET TO WHICH AMPLIFICATION MAY BE ADDED

at least five inches square. Using thearrow point as the center, a circle is drawnoutside having a diameter of five inches.A ruler is then used to draw straight linesextending the spokes outward from the in-ner circle to the outer circumference. Thisdone, the form is cut out with scissors or asafety -razor blade, and the result is aspider -web form five inches in diameterhaving thirteen spokes evenly spaced.This is then used as a pattern for cuttingout four more, equal in size and shape.

The next pro-cedure is to windthe coils. Theprimary at the leftof the drawing iswound first. Itconsists of 40turns of No. 22 d.c. c. wire tappedas follows: 1st-beginning - 2nd,5th, 10th, 20th,30th and 40thturns. This makesseven taps in all,but one-the be-ginning- is usedas a connection tothe coil, thus leav-ing six taps, whichare to be con-nected to as manypoints of the tapswitch. The armof the tap switch serves as the other con-nection to the coil through the taps.

The secondary coil consists of 45 turnsof No. 22 d. c. c. wire. In winding thesecoils, begin at the center and, leavingabout five inches for a connection, wind

A MODEL FORM5"

under two spokes and over the next two;under two and over two, until the entirecoil is finished.

Before starting the N and P coil, placeeach of the spools of No. 26 green silk andwhite double cotton covered wire overtwo large nails so that the wire will easilyunroll from the spools as the coil is wound.

Leaving about five inches for a connec-tion, the beginning ends are tagged asfollows: White, No. 1; green, No. 2. Bothwires are then wound together on the

form just asthough they wereone single wire.Wind under onespoke and over thenext for twentyturns. This com-pletes the wind-ing. Leave fiveinches for makingconnections andcut the wire fromthe spools. Theends are then la-beled as follows:White, No. 3;green, No. 4. It isimportant to labelthem correctly, ason this coil largelydepends the effi-cient operation ofthe receiver.

After the wiresare fastened in place by giving them anextra twist around the nearest spoke, aninch of white insulation is removed fromthe No. 3 end and the green insulation fromNo. 2 is scraped for a similar distance.These two ends, No. 3 and No. 2, are then

FOR ROBERTS COILS

HOOK-UP OF THE ROBERTS REFLEX RECEIVER

February, 1926

. twisted . together... This then_ _ ..-b+econles the 'Nº. 2 terminalof . the- N. and P coil shown ineach of the diagrams and theoriginal No. 4 becomes No. 3.

The seéondary coil in thecenter consists of 45 turns ofNo. 22 d. c. c. wire. Thetickler coil is wound with 18turns of No. 22 d. c. c. wire.The secondary and ticklercoils are each wound undertwo and over two spokes.

A support is next con-structed for the coils. Theprimary and secondary arespaced half an inch apart byan adjustable screw. Thisscrew passes through an up-right held in place by a smallblock of wood at the base.Similarly, the N P coil ispermanently fastened half aninch from the secondary, butthe tickler coil must be so ar-ranged that it may be movedbackward or forward.

Making this arrangement is partly leftto the ingenuity of the builder. A studyof the photograph shows the method usedby the writer. The tickler coil is attachedto a hollow sleeve which slides over a screwprojecting from the secondary coil.

The panel is next laid out and the holesdrilled, after which the instruments aremounted following the plan indicated inthe photographs. The primary and sec-ondary must be mounted at right angleswith the N -P, secondary and tickler coils.This is very important. The 7x21 -inchpanel is sufficiently large to allow roomfor a push-pull amplifier to be added later.

The neutralizing condenser may behomemade by sliding a brass sleeve orcopper gasoline tubing over a piece of buswire 3% inches long over which a pieceof spaghetti insulating tubing has beenplaced. There are a number of midgetcondensers on the market which will effi-ciently serve the purpose instead.

Either dry -cell or storage -battery tubesmay be used in this receiver. The writerfound it easier to neutralize the set witha -99 tube in the radio -frequency stage.A 60 -ohm rheostat makes it possible tooperate this tube direct from the 6 -voltsource. A 5 -volt detector tube was used.

Operating Pointers

After the instruments are mounted andproperly connected, the set is then neutral-ized. Place the switch lever on a centertap and the tickler coil as close as possibleto the secondary, then light both tubes.Adjust the variable condensers until thesqueal of a broadcasting station is heard.After tuning in the squeal as loud as pos-sible, move the tickler coil away from thesecondary and adjust the neutralizing con-denser until the squeal vanishes and theincoming signals are clear.

The final adjustments of this receiverinclude experimenting with the variousdetector B battery taps between 16 and 45until the proper voltage is found whichgives best results with the particular tubein use. It is also well to either try varioussizes of fixed grid leaks between 2 and 8megohms or else adjust the resistance ofthe variable leak until the signals are clear.The C battery voltage should be varied.

Accidentally short-circuiting the neu-tralizing condenser places the entire Bbattery voltage across the filaments ofboth tubes. For this reason it is advisableto connect a .001 mfd. fixed condenser inseries with the neutralizing condenser,thereby protecting the tubes from acci-dental burn -out. This is not shown in thehook-up, but it is listed under parts re-quired and is an advisable precaution. Itwill in no way affect the operation of the set.

In some sets it may be necessary toground the negative side of the filamentlead to bring about stability. Excessive

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

l-IE CuI; N'I'RY C; EN"I'I,EN1ANOctober, 1927

The World at Your Command -With the World's Best Radio

VERYONE realizes the important part that radio playsin our lives today. Every hour of every day there issomething on the air worth listening to-music,

lectures, bridge lessons, news of the day, cooking recipes,stock reports, playlets, opera-most anything you desire.

When all of these things, and a thousand others are atyour command, why be without them? When receptioncan be obtained with the marvelous fidelity made possiblewith STEWART-WARNER Matched -Unit Radio, there isnothing further to be desired.

In its wonderful new line of models, STEWART-WARNER has incorporated all of the latest developmentsthat make for complete radio satisfaction. Of course, theSTEWART-WARNER Matched -Unit Radio is highly selec-tive, will get distance, has wonderful tone, range and vol-ume. It's made by STEWART-WARNER, a big, reliablemanufacturer, with over 20 years' experience in the pro-duction of quality electrical equipment-with over 16million users of its products. For years, this name has beenrecognized as the trademark of satisfaction.

So, now that you're going to buy a radio, visit one of ourBlue Ribbon Dealers and buy a STEWART-WARNER. En-joy the thrill of having at your command-in all its originalcharm -this world of entertainment, with the world'sgrePst radio-STEWART-WARNER. The brand to demand!

STEW ART-WARNERSPEEDOMETER CORPORATIONCHICAGO, ILLINOIS, U. S. A.

Rf.PRODIICF.RMODEL 425

SFPRODUCERMODEL 420

MODEL 705705

0 6MODEL 525

1lODEL 520

MODEL D0

MODEL 300

Reproducer. Model 425-Diameter II 1-4 inches.

$25 -$26Reproducer. Model 420-

Diameter 9 Inches.$17.50-$13.25

Model 520-Six tubes.Single dial vernier con-trol. Without accessories.

$125-$130Model 300-Three tuningdials. Five tubes. With-

out accessories,$50-$52.50

Model 705-Fully shield-ed chassis. Six tubes.

1

c -f WonderfulOpportunity for

`DealersIf you have not al-ready procuredyour Stewart -War-ner franchise, do soat once. The Stew-art -Warner policy-with its manyspecial and protec-tive features- off-ers unlimited pos-noiirie; úS I7r A-ing money. A re-quest will bringcomplete detailsimmediately --with

no obligation.

Single dial vernier con-trol. Without accessories.

1125-15128Model 525-Six tubes.Single dial vernier con-trol. Without accessories.

$80-$82Model 710-Six tubes.Single dial vernier con-trol. Fully shielded chas-sis. Wit bout accessories.

$255-$26,3.50Stewart -Warner Tubes.

$1.75 Each %'est of Rockim

STEWART - WARNERJWatched--Unit radio

1r,

February, 1926

LOCATION OF INSTRUMENTS IN ROBERTS REFLEX RECEIVER

squealing may be due totoo much detector Bbattery, and no soundsat all may indicate eithertoo low a B batterydetector voltage or elsean open circuit or a broken wire. Tryingvarious sizes of fixed condensers acrossthe secondary of the audio -frequencytransformer andC battery maygreatly improvethe signal qual-ity. Best resultswere obtained inthe writer's setusing a .00025mfd. condenser.It brought abouta slight increase in the volume and im-proved the all-around efficiency of the set.

STUART C. MAHANAY.

(Continued from Page 70)

SUGGESTED PA

Tuning In Pays Kansas

They neighbor with theirneighbors, go to church, plant and harvestwheat, corn, oats and sorghums, milksome cows and keep poultry. They shouldhave got along these past few years, butthey failed despite their frugality.

"Last winter we owned a little one -tubeset which brought the college in fine. Johnand Mary were encouraged to share a pairof ear phones during a college -of -the -airprogram one evening. They came backthe next evening and the next and the next,until our boy had helped them constructtheir own set.

"Soon the twenty -three -year -olds, whohadn't been holding their own at farming,were sitting in their living room listeningto authorities on crops, cows, poultry, pigsand other subjects talk what they saidsounded to them like common sense.

" Dean L. E. Call declared one eveningthat smooth -type -ear corn yielded an aver-age of approximately ten bushels more anacre than the rough. He told why. Thissounded convincing to John, who alwaysput about fifty acres to corn and, accord-ing to custom, picked the rough type.Fifty acres times ten bushels, times onedollar-five hundred dollars saved rightthere, he figured.

"John became a convert to the scienceof agriculture. ' These old limestone hillsshould be grow-ing sweet cloverinstead of su-mac,' the soil ex-pert shouted onenight at him andabout five thou-sand other farmerswho, it is esti-mated, attendregularly the col-lege of the air. 'Itwill pasture fivetimes the numberof cattle, besidestaking nitrogen-the highest -priced

fertilizer element-fromthe air and putting itin your soil.' That wasmore good news to John,and he fired a letter intothe station's noonday

question box, asking for more informationand a bulletin about sweet clover whichthe college lecturer had mentioned.

"John wasmore or lessamazed at thenumber of help-ful facts whichthe college wasable to contributeto his busi-ness. He told hisneighbors what

he heard, often calling them on the phoneafter a lecture. He treated his sorghumseed for smut at a cost of five cents abushel and a saving of sixty dollars. Hegot his first stand of alfalfa seeded the'radio way.' His spring pig crop was far-rowed out on clean ground away from oldlots contaminated with roundworms, thebane of his hog business; he fed them abalanced ration, and marketed at the timethe college marketing specialist forecastthe peak price."

It is paying this young farm family totune in on Station KSAC.

NEL LAYOUT

`Dural Schools Join In

MRS.JOHN, so Neighbor Jones re-

ported, sold off her poultry flock, tostart in fresh with certified stock bred forhigh egg production. She enrolled for thetwenty-eight radio extension courses andreceived the printed lectures. Both Johnand Mary studied them, took the exami-nations and received certificates from thefirst college of the air.

Twenty per cent of the Kansas farmershave radios, and nearly all that numberlisten to the college station.

The noonday program, at which a ques-tion box and two short timely talks arefeatured, is considered the most valuableservice. However, the response from thecollege of the air, an evening program, hasbeen almost as great.

Another popular feature is the House-wives' Half Hour-the 3-H program-broadcast in the middle of the forenoon.

The experiment with a rural -school radioprogram appears to college officials as offer-ingthegreatestpossibilitiesof all. Onlyafewdozen of the 10,000 rural schools in thestate

were equipped tohear the ten weeks'program, but fromthis number camesuch universal ap-proval that a greatdeal of interest wasawakened inequipping otherschools. In fact,one county had aradio set in all itsschools last fall.This experiment isbeing watchedclosely by educa-tors.

0/1f/Y4FEtW/973 B>4CKissUs oTfr` 11-IO7QN

sI:rctic1e 1-i:FT

The HORN SPEAKER.... 9820 Silver Meadow Drive. Dalas. Tartas UM

82

ewes? 51911" "in `Radio

THE 1926 model re-ceiving sets dis-played at radio shows

throughout the countryduring the past severalmonths bear conclusivetestimony to the fact thatthe " revolutionizing " de-velopments expected bymany, and in anticipationof which countless pur-chases have been put off,have yet to make theirappearance.

This should prove awelcome message to thosewho in the past wanteda radio receiver but de-ferred buying in the beliefthat whatever set they se-lected might lose its valueand utility shortly after-ward through the adventof a new and revolution-izing invention. Theywould then be in the posi-tion of having to operate an out-of-dateset, inadequate to their needs, or else dis-card it and pay out more money for one ofthe newer types incorporating all of thelatest improvements.

But such is not the case. Improvementshave been made, to be sure, but simplicityis the keynote of the newer models. Theprincipal changes which have been madeare largely those of refinement. Single andtwo -dial control receivers had a muchlarger representation at the recent radioshows than ever before. A few were en-tirely without dials. The new cabinets aremore attractively finished and the designsare more elaborate and varied, whereasthe mechanical construction within ismore rugged. Better tone quality, in-creased selectivity and greater ease of op-eration were the talking points stressed bythose in attendance at every booth. It wasalso evident that prices are lower now thanever before.

Simplicity is the Keynote

On every hand it seemed apparent thatmanufacturers have turned their attentionfrom the creation of new circuits to thesimplification and improvement, whereverpossible, of those which already havemade a permanent place for themselvesthrough months of satisfactory results.And with simplification has come thedressing of these new models in cabinetsof pleasing designs which will blend har-moniously with other articles of furniture.

As to circuits, five -tube sets employingvarious forms of tuned radio frequencyseem still to be the most favored by manu-facturers. Some are using resistance -coupled audio -frequency amplification andthis adds an extra tube, making six in all.Otherwise, with few exceptions, there havebeen no outstanding changes in the ma-jority of those offered.

Quality of reproduction has come infor a large share of the attention and ef-forts of manufacturers both of sets andloud -speakers during the past twelvemonths. The public is coming to look forand demand what is destined to become amatter of paramount importance in thefuture-tone quality.

Some cabinets incorporate a built-inloud -speaker and, at the back, room is pro-vided for the necessary batteries or powersupply. Others were offered in unique anddistinctively original creations. Therewere writing -desk console styles, round,square, rectangular and upright types,not to mention those modeled after periodfurniture designs.

There were countless varieties and stylesof loud -speakers. Many manufacturerswho in the past have confined their repro-ducer models to the horn type have this

THE COUNTRY GENTLEMAN

To PlatedDetectorTube.

o 90-135 Volts

A B

A PICTURE DIAGRAM SHOWING THE CONNECTIONS FOR A RESISTANCE -COUPLED AMPLIFIER

`radioyear added a cone speaker to their lines.Horn speakers of every conceivable size,shape, dimension and design were in evi-dence, although there seems to be a grad-ual tendency toward the concealed or conetype. However, the transitional period willprobably cover a number of years.

Appearance, however, is more often ofsecondary importance when tone qualityis considered. In the writer's opinion,greater advancement has been made alongthe lines of developing loud -speaker tonequality and naturalness of reproductionthan in any other field of research duringthe past year.

There were many different makes of de-vices designed to dispense with A and Bbatteries. Some were single units. Otherscombined both under the one cover.There were receivers with these devicesmade a component part thereof, and tooperate the set it becomes necessary onlyto attach it to the nearest electric lightsocket and adjust the dials for the desiredsignals.

Many battery eliminators were on view,but the success and satisfaction whicheach type will give could not be ascer-tained by a show -case examination. Theproof of the efficiency of such devices liesin the actual testing, connected to a radioreceiver and the light socket.

e,w Types of Battery Chargers

The representatives of these devices,however, made it clear that the manufac-turers would guarantee satisfactory resultswhen used with any standard type of radioreceiver.

There were many different styles of Abattery chargers. A new type of particular

interest is one which delivers a "tricklecharge." In other words, the battery isbeing charged at a very low rate at alltimes except when it is actually supplyingenergy to the radio set, in which case thecharger is disconnected from the circuit.Low -capacity storage batteries especiallyadapted for use with this charger are nowbeing offered by practically all of the lead-ing battery manufacturers. Both the bat-tery and charger are so small that they canbe put into the usual dry -cell compartmentof any late -model receiver.

5t (any Accessories on View

There were countless varieties andstyles of accessories. Fancy and plain ver-nier dials, new -f angled antenna insulators,switches, kits of parts, and lead -sheathedantenna wire intended to be buried in theearth outdoors or in the basement and forwhich great claims were made.

One of the leading manufacturers oftubes recently announced a number of newtypes which will fill a long felt need. Oneof particular interest is designed to be usedin the second stage of an audio -frequencyamplifier in place of the usual amplifiertube in order to bring about great ampli-fication with a minimum of distortion.Higher B battery voltages may then beused.

The visitor leaves one of these exhibi-tions with a feeling of assurance that theonly changes which are now taking placein the radio world are those gradual oneswhich characterize the development ofevery scientific achievement that benefitsmankind in direct proportion to the degreeto which it is perfected.

STUART C. MAHANAY.

THIS PHOTOGRAPH SHOWS A DESIRABLE LAYOUT FOR THE VARIOUS PARTS

December, 1925

t llArmpra ur,AmplificationPRACTICALLY every

radio receiver employ-ing three tubes or moremakes use of audio -fre-quency amplification. Al-though this seems like abig term, the system itdesignates is really sim-ple in its operation. "Am-plification" is a wordwhich implies increasingor " boosting." The appa-ratus which brings aboutamplification is called an" amplifier." Therefore anaudio -frequency amplifieris a device which increasesthe volume of signals ataudio frequency.

There are two kinds offrequencies -" radio"and "audio." Radio fre-quencyistheterm appliedto frequencies above 10,-000 per second and towhich the human ear does

not respond. Audio frequencies are thosebelow 10,000 to which the ear can respond,after which it transmits the sensationsto the brain and we speak of the result ashearing.

In every amplification system, somemeans must be provided for "coupling"between each tube. In most receiversaudio -frequency transformers are em-ployed. However, this method has itsdisadvantages. Distortion is usually pres-ent to a greater or lesser degree in everytransformer -coupled amplifier.

This article deals with a system thatis not new, but which is rapidly comingagain into popular favor because with itsuse distortion is practically unknown. Itmakes use of two resistances and a fixedcondenser properly connected in place ofeach transformer.

The advantage of this method overtransformer -coupled systems is that thesignals are purer and practically free fromdistortion. The resistance units are in-expensive and easy to obtain. Althoughadditional B batteries are necessary, ifbest results are to be obtained, the oper-ating cost of the set is really not increased,for the B battery current consumption islowered when resistance -coupled amplifi-cation is installed. A 3 or 6 volt C bat-tery at F below L3 in the diagram willprolong B battery life. The amplificationper stage is less than when transformersare used. For this reason three stagesof resistance -coupled amplification willgive approximately the same volume astwo of audio.

Installation is Simple

Those who wish to experiment with thesystem will have little difficulty in givingit a trial for it is only necessary to loosenthe fod transformer binding posts, lift itout of the set and replace it with a con-denser and resistance units of the propersize. The connections are shown in thepicture hook-up accompanying this article.If care is exercised in making the change,a vast improvement in tone quality willresult. It may be used with any typeof receiver except a reflex. It can beconnected to the output of a reflex for in-creased volume, but the resistances can-not be substituted for the transformers.

The plate coupling resister Rl with theisolating condenser Cl and the grid leakLl can be purchased already made up ina compact unit on which the G, P, F andB terminals are indicated to facilitateconnection in place of an audio -frequencytransformer. Likewise the R2, C2 andL2 and the R3, C3 and L3 units can bepurchased ready for installation. Theillustration shows an assembled amplifier

6 The HORN SPEAKER..,., 8820 Silver Meadow Drive, Dallas, Texas 75217

December, 1925

using these units. Vari-able resistances of theproper size may be used,but they will cost more,take up more space andgive no better results.

An entire three -stage amplifier unitmay be purchased completely wired andready for use when the tubes, loud-speaker and batteries are connected. Thisgreatly simplifies the process. Most ofthe, necessary parts, except perhaps theresistances, will be found in the averageexperimenter's shop or laboratory. Theyare as follows: 3 sockets; 3 tubes; 3 plateresistors, R1, R2 and R3 of 100,000 ohmseach; 3 grid resistors, Ll, L2 and L3 of 1,IA and % megohm each, respectively; 3fixed condensers, Cl, C2 and C3 of .006mfd. capacity; 2 fixed condensers C4 andC5 of .002 mfd. capacity; 3 rheostats orone ballast resistor; 2 jacks, one open andone closed circuit; 5 binding posts; 1

baseboard 6x1830% inches; 1 panel 7x18inches-optional.

Ninety volts will operate the system,but an additional 45 -volt B battery isrequired for bestresults. The detec-tor plate voltagealso must be in-creased to a valuesomewhere be-tween 60 and 90 tocompensate for thevoltage drop acrossthe resistance Rl.The proper tap forthe particular de-tector tube in usecan best be deter-mined by experi-mentation.

October, 1921

(Continued from Page 82)

THE COUNTRY GENTLEMAN

Any type of standard 11

amplifying tube may beused. A "soft" tube isnot suitable as a detec-tor, however, as suchtubes will not function

on the high plate voltages, required forresistance -coupled amplification.

Dry -cell tubes may be used. However,the amplification will not be so great aswhen 5 -volt quarter -ampere tubes areemployed. Even better results will beobtained by using a new type of tubedesigned especially for the purpose andrecently placed on the market by a num-ber of manufacturers. They operate on6 -volt filament current and have an un-usually high amplification constant whichis greatly to be desired of the tubes in thisclass of work.

If hand -controlled rheostats are em-ployed, a voltmeter or ammeter should beused to keep the filament current at ex-actly the proper value designated by themanufacturer of the tube. An alternative,however, is to use a ballast resistor,which,in this case, performs in just as efficient a

manner as one ormore rheostats andhas the added ad-vantage of requir-ing no further at-tention.

Additional infor-mation concerningthe addition of re-sistance coupledamplification toany particular typeof receiver may beobtained by writ-ing to the RadioEditor.

/YI.fIr C1T71ERcO1-1-.EOrORs,,4DYR77//V 7?-t .1-7`07:eN

SPF-AxRSOON

Agents! Dealers!Big Profits!

Make big moneytaking ordersfor Metrodynes. All or parttime. Metrodyne All -ElectricRadios are in a class by them-selves. Unequalled for qualityand performance at the price.Demonstrate at home and takeorders. Lowest wholesaleprices. Your demonstratingset on 3Odayá free trial. Writetoday for further details.

GORGEOUSCONSOLE

ALL -ELECTRICRADIO

Genuine walnutcabinet, in beauti-ful, two-tone fin-ish. Built -is gen-uine Metro Conelarge size speaker.Brings in pro-grams with greatSul ume. reproduc-ing the entire rangefrom the lowest tothe highest noteswith remarkableclearness and di,-tinction. All metalparts finished inold gold. Wonder-ful electric radio.in a cabinet thatwill beautify theappearance of anyhome.

Three Year GuaranteeShipped direct from our factory at

ROCK BOTTOM PRICESCosts Less Than Most Battery Sets

No Batteries,Chargers or EliminatorsNo Acids; No Liquids-Plug In-Press Button-Tune In

7 Tubes -Single Dial SetAt last I The radio you've dreamed about ! If you have electricity in yourhome you can now enjoy long distance reception without the need of anybatteries, chargers, eliminators, etc., with this genuine batteryless radioset. Simply insert the plug in socket, press switch button and "tune in."

You could not get a better value in a radio set than theMetrodyne All Electric.

Beauty-Efficiency-Dependability1000, Electric Radio. Only the highest quality low loss

parts are used throughout. Solid walnut cabinet, beautifultwo-tone effect, with handsome gilt metal trimmings. Haselectrically lighted dial. Log stations in the dark. Only onedial to tune in all stations. Excellent tone qualities-won-derful volume-very selective. Size of cabinet, 28x13x10.Costs Less Than Most Battery SetsDo not confuse the Metrodyne electric radio with ordi-nary gt sets, because tr isan Allli Ehtlectsockeric Rºdoo-consumesthe lessMe thanodyne2c worth oftrulypower a day. Comes to you direct from the factory.Its low cost brings it down to the price of an ordinarybattery set.Write O We are so confident that you will be delighted with

this wonderful. easy -to-operate Unary!~ RadioToday* that we offer to ship it to your home for THZaTT

DATE' FREE TRLL-you to be the j Apostal or letter brings complete information. WRITE TODATudge.I

METRO ELECTRIC COMPANY2165 N. California Ave. Dept. 467 Chicago, Illinois

JONESRADIO9he PRECISION Receiver

el Model fbrEvery Home

The model illustratedabove is J175: a6 -tube receiver pricedat . . . . $175

iModel >175C

Same «Mk Loud -Speaker Table

Price . $250

Model 1.100B

Price ,$100

Model J100CSame with Loud -

Speaker TablePrice . $150

Model J -75BruPrice . $75

Also De LuxeModel J175DUpright CabinetPeriod Design

Price . $475

(AU prices quotedless

,At LastThe QUALITY receiverthe World has waited for

CiÍyERE, at last, is the Radio Re-ceiver you have waited for.

Not a trick circuit-but the time testedprinciple of Tuned Radio FrequencyPLUS perfect precision in design, con-struction and coordination of parts.

PRECISION is the secret of depend-able radio reception. Perfect precisionin every part reduces loss of energymakes it possible to pick up, and build up,weak signals from far distant stations,and to reproduce such signals with amaz-ing volume, perfect clarity and fidelityto tone.

It has remained for Jos. W. Jones, for28 years an inventor and manufacturerof precision instruments and parts, toproduce the standardized, precision -maderadio receiver that the world has beenwaiting for.

Hear it TODAY! Judge for yourselfits Hairbreadth Selectivity-its DelightfulTone-its matchless Ease of Operation.

A demonstration will prove, beyondthe shadow of a doubt, that here at last isa Radio Receiver you can depend uponfor uniformly dependable performance.

Write today for descriptive folder and the nameof a nearby dealer, who will gladly demonstrateand install a Jones Radio Receiver in your home,at small cost, and on convenient terms of payment.

Manufactured by

JOS. W. JONES RADIO MFG. CO., INC.40-46 West 25th Street

New York

Mr. Jones is the inventor of the famousJones Speedometer, the Jones PhonographRecord Process, the Jones Electric Drill, theMotrola, the Jones Tachometer, the JonesTaximeter-and many other precision in-struments. More than 30o patents have been

granted him.

Jos.R A D I O

TRADE MARK

PRECISION -MADE RADIO RECEIVERSDEALERS: Get particulars of our interesting Franchise Agreement

NOW. Valuable territory still available. Write or Wire.

85

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

[)

l7t

illilifi ':l)',i11i!11t111 -

Model 1900-R-2Finished in American Wal-nut,with built-in Pooley(pat-ented) Floating Horn andAtwater Kent Receiving Set.Prices complete, withouttubes and batteries.

$135 to $160

ilÍllil¡:'

THE SATURDAY EVENING POST

RADIO CABINETSzvith,

ATWATER KENTRAD I

.:-

..'u---

Look for the name"POOLEY"

Here are good reasons

JHERE'S far more to a radiocabinet than just an ornamental

setting for a radio receiver.

It must have a good speaker. The built-in Pooley floating horn is exceptionallylarge, scientifically designed, constructedof choice spruce, the wood of fine violins.It rests on pads of sponge rubber to stopvibration. Size, design, mounting-givePooley its incomparable golden tone.

The set must be expertly installed-asAtwater Kent Radio is installed, wired andtested in the Pooley factory.

The cabinet for a good set must begood itself, good through and through.The design ails quality of Pooley cabinetwork meet the exacting standards main-

;il;lliiiÍi.;ili;jil;ilil Lli

Model 1100-R-2Finished in Ameri-can Walnut or Eng-lish Brown Mahog-any, with built-inPooley (patented)Floating Horn andAtwater Kent Re-ceiving Set. Pricescomplete, withouttubes and batteries,

,$240 to $320

Thebuilt-in Pooley(patented) floatinghorn -34" longwhen developedin a straight line.Scientifically de-signed-a trueexponentialhorn. Made un-usually large, for

full volume.Mounted onsponge rubber toeliminate vibra-tion. Cannot wearout or get out oforder. Equippedwith the celebrat-ed Atwater Kentreproducing unit.

These views show thefine workmanship ofPooley Cabinets, inthe joiningof top andside panel at the left,and below, the dow-elling of stretcher tocross piece. All con-struction is of thesame high order-joints mortised ordowelled and heldtogether with furni-ture maker's glue ap-plied hot. A PooleyCabinet, like the finefurniture it is, willlast a lifetime.

Mr. Atwater Kent says:"The Pooley Radio Cabinet is ap-proved for Atwater Kent Radiobecause of the design and qualityof Pooleycabinetwork and becauseof the tone qualities of the Pooleybuilt-in floating horn. Both meetthe standards we set and maintainfor Atwater Kent Receivers andSpeakers."

(Signed)A. ATWATER KENT

1tüllli ia 111

'il 11111'lllljllí?!lI'1;1 :h!1,).

4!1.,iltr

Model 1600-R-2Finished in English BrownMahogany or American Wal-nut, with built - in Pooley(patented) Floating Horn andAtwater Kent Receiving Set.Prices complete, withouttubes and batteries.

$175 to $200

11.

147

¡! l

II' I Í

C)tlt)t3t7t7t3

tained for Atwater Kent Radio. PooleyCabinets are made like the finest furniture-sturdy, enduring, beautiful.

This is a cabinet radio you will valuemore, the longer you live with it. Don'trisk disappointment - hear the Pooleyhorn, examine Pooley Cabinets, beforeyou select your radio. Look for the name"Pooley" before you buy.

All the Pooley Radio Cabinets and Pooley

Cabinet Speakers are shown and described

in our new catalog. Send for it.

THE POOLEY COMPANY1664 Indiana Avenue Philadelphia, Pa.

Beware of imitations-look for the name "Pooley" before you buy

Prices slightly higher west of the Rockies and in Canada. Canadian Pooley RadioCabinets are manufactured M Malcolm and Hill, Ltd., Kitchener, Canada.

Model1300 -R -2D

Finished in Ameri-can Walnut or Eng-lish Brown Mahog-any, with built-inPooley (patented)Floating Horn andAtwater Kent Re-ceiving Set. Pricescomplete, withouttubes and batteries,

$225 to $305

I

Illi i 1'lljli'I'

..-.satr+1.r.+a.a.;; :o-.L'YYBObam7at8dM`

1c..`.

IÍllllii

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

that it was a Rordon-Hauck Navy Sup-er. I owned one in '27 or '28.The set has a separate unit for thepower supply and last stage ofaudio pp. 10 or 50. However I was

not aware of the fact thet Charlesleutz had anything to do with theNordons or Haucks. Hauck was a

family friend. But it might bepossible, your archives perhaps will

tell. The know how those days weretwelve or fifteen individuals. It

would be interesting if you couldrun an article about the Nordonsand Haucks. There must be a few ofthese sets around yet, (wish I hadmine).

Enclosed is an ad for you torun in the next two issues. Good

luck Jim.Cordially yours,Route 1Marlboro N.J. 077146

Dear Mr. Crenshaw:Enjoyed reading my first copy of

THE HOR11 S_r'EAKER, and want to write

and ask about doing en article.First, let me tell you a little a-bout our Broadcast Museum (Brochureenclosed) . It began two years agoas a tribute and storehouse of ourown stations' (television, AM andFM radio) memorabilia and has cr-panded into an entire house of arti-facts dating from pre -broadcast in-to the future (laser and holographs).

LETTERSDear Jim:

Enclosed you will fine anotheryear's subscription for THE HORNSPEAKER, which I enjoy a great deal,reliving the years behind me.Having been in the radio and tele -c Smrnunications profession all mylife, starting in 1921. Now beingretired and enjoying a few hobbies,which include antique radio, tele-graph, phonographs, automaticmusical instruments and antique careas well es an antique steam train.All these keep me occupied throughthe various seasons.

Looking back thru the years,radio communication progress has beenphenomenal. During my era I havehad the opportunity to be involvedwith spark, arc, h -f alts, tubes andlastly solid state, all in 60 yearsor less. Just imagine what the next20 years will bring in the electronicera.

I have been collection for thelast ten years (prior to that Ididn't have tire) and have a respect-able radio collection of about 100sets, some ham gear, some test equip-ment and some very old telegraph e-quipment (printer with piano keyboard) made in France.

In your last issue of THE HORNSPEAKER on pp. 2, the ad of the C-10Super -Het., there was no mention

. HEY. -HEMCOME HEREEVERYBODY;QUICK

HbLLO"AR'IERICA-THIS 15, LON041Y,EIYGLAIYO--- -

TELLGI:A l AND EVE\ING MAIL RADIOSalurday, March. 21, 1925.

I have tried to show and explain theconcepts and technology in exper-iments and demonstrations, ratherthan just put out a lot of old setsto see. Local colleges and our ownengineers have built these displays;and we believe we have a most uniqueconcept. Frank Blair, who had hisfirst job at 'MSC Radio, has narratedour Tourtape which is called "FromTomTom to Telstar."

We have recently acquired a magnif-icent collection of early gramaphones,phonographs, and /logic Lanterns; PadI am now in the process of research-ing and writing on this phase as anaddition to the tour tape. Prior toopening this new room, we concentrat-ed on just radio and television....past, present, and future. I amjust fascinated and intrigued bythe rivalry, patent infringement, andcourt battles at the turn of thecentury over processes of recordingsound.

In our Museum, we feature the de-velopment of Edison's cylinder phono-graph as listening parlor entertain-ment, the traveling entertainer, andbusiness machines and schools. '.1e

show Berliner's disc development andthe battle of the spindle size. The

story of the picture of Nipper, theRCA trademark is fascinating. (Did

you know that the artist first paint-ed Edison's machine and offered itto him; but Mr. dison said he didn't

Mille 1111111.1111.11lll1e

\.Not As He Seems

WRY MR. JONES!How LONG MICE.You S THIS WAY?

._ __

- LC\ :.,T}IÉ DOOR BELL I. RANG

M-1116 AB5097 MWDED JONESt\AS TI WI? INO .RADI(J,,,

CIA(Igiir9-.

The HORN SPEAKER..... 9820 Silver Meadow Drive, Dallas, Texas 75217 9

Li J.+ w- ' .w.s.

:-r i

....,.,Aq,.,..nip~q~s....r,.o.....:,.... ....~,.r..,.......... -

.. t

Victor-Victrola XVIMahogany, $200

Quartered oak, $200Circassian walnut, $250

Horn and all moving parts en-tirely concealed. Music madeloud or soft by opening orclosing small doors.

The cabinet contains albumsfor 150 records and drawerfor accessories. All metalparts heavily gold-plated.

Other styles of the Victorfrom $10 up

or-Victrola

Caruso listening to his own voice on the Victrola

F only a few of the world's greatest artists made records exclusivelyI for the Victor, it might signify little. But when such famous singérsas Caruso, Calve, Eames, Farrar, Gadski, Homer, Melba, Plancon,Schumann-Heink, Scotti, Sembrich and Tetrazzini all make recordsexclusively for the Victor, it is not only a splendid tributeto the high musical qualities of the Victor, but themost conclusive proof of its all-around superiority.

Prove it for yourself. Hearing is believing. Any Victor dealerwill gladly play any Victor music you want to hear.

Write to us for complete catalogues .of the Victor and Victor-Victrola, and Victor Records; also name of the nearest Victor dealer.

Victor Talking Machine Co., Camden, N. J., U. S. A.Berliner Gr:un,,l,hune co., 1\luntrcal, Canadian Distributors.

To- get best results, use only Victor Needles on Victor Records.

HIS MASTERS VOICE

A complete list of new Victor Records for May will be found in the May number ofMunsey's, Scribner's, McClure's, Century. Everybody's and June Cosmopolitan.

The HORN SPEAKER 9820 Sifter Meadow Drive, Dallas, Texas 75217invent his machine for "dogs" tolisten too and chose another adof a little old man and a little oldlady. We have both pictures whichcan be copied) --Have you ever seena folding horn that packed into thetop of a case and made a packageabout 12 inches square by 1a i.ncheedeep? It was great for safari's in.Africa...incase you wanted to takeyour culture with you backpacking.We could take pictures of many of theold horn speakers and we have somegreat ones - like a solid mahogany,the usual brass and morning glory,puls other hand -painted varieties.We can show and explain the exponent -lei horn with a cut-away in theMuseum. And the Magic Lanterns area thing of beauty. We have modelsusing kerosene, gas, carbide andhand -painted ''slides" ...plus postcard projectors, the Kinetoscope-- the great beginnings of video?

Not being aware of what articlesmight have covered in the past, Ithought I might inquire if you havean interest in my developing anarticle about any of the foregoing.Please let me know if you are 5n-terested.

I hope you will stop by the WCSCBroadcast Museum when you are inthis vicinity. I'd like very muchto show you around.

Sincerely,Patsy M. HickenMuseum DirectorP.O. Bcx 186Charleston S.C. 291102

Editor...Speaking for the read-ers, T am anxious to read yourarticles.

BACK ISSUESThe Horn Speaker

All 10 back issues for 1973...$8.00Single issues...$1.00 each

All 10 back issues for 19711.../.6.00

Single issues...$.75 eachAll 10 back issues for 1975...$5.00

Single issues...$.75 eachAll 10 back issues for )976..45.00

Single issue...$.75 eachAny single issue of 1977...$.75 each

Later, we should have completevolumes for 1972, first year.

The Horn SpeakerBoli 12 Kleberg, Texas

75145

Rates for THE HORN SPEAKEROne year $5.50Two years 9 00

Special rates for one year(mailed in envelope)First class $8.50Air mail $12.00Foreign air mail...16.00

Mail address: THE HORN SPEAKERBox 12Kleberg TY 751115

Dear Sir:

Please send me information ifyou have any on construction of a

Browning and Drake radio coils andall of the equipment needed to makea complete ,s

T iáill send the money needed tocover the cost when I get the infor-mation from you whether you canhelp and if not please let me knowof anyone that could, no matter whatthe cost would be.

Yours truly,John P. Asanciac10516 Eensley Ave.Chicago IL 60617

EDITOR...No.charge for information.

FREE PUBLICATIONMARINO 20's is a three -year -old

publication about collecting and pre-serving vintage radios. The nextissue, they say, will be sent to any-one who sends a self addressed stamp-ed envelope to: Floyd Paul, 1545Raymond, Glendale CA 91201.

THE NEW PHONOGRAM FOR SEPTEMBER, 1907

REPEATING PHONOGRAPH CLOCKADOWNTOWN clockmaker has worked out a re-

peating phonograph clock, which in his beliefwill in a large measure supplant the old style

of hell repeaters. His mechanical arrangement con-sists of a pair of cylinder records on which have beenrecorded the hours and each five minutes of the day.These are moved along a bar by clock work, and whenit is desired to know the time, the pressure of a buttonthrows the diaphragm into place, the record revolvesand announces the time after this fashion --"two thirty-five." He says it is only a matter of mechanics to pro-duce a clock that at the prop 'r time in the morningwill release a weight that will lift the clothes off a bedand at the same time call out, "John, it's time to getup. Hurry on now, the breakfast is on the table andall getting cold. Come on, get a move on you, etc.,"with such repetitions and variations as will be mostpleasing and effective in assisting the slumberer inthrowing off his torpidity.-Talking Machine World.

DIFFICULT TO PRONOUNCE WORDSFEW people know how difficult it is to pronounce

some words to a talking machine so that theywill be plainly heard in the reproduction, says

The Sound Wave. One leading article declares that theword "thrice" is his shibboleth. That which reachedthe ear in the reproduction unless the greatest carewas taken, was the word "Ice," which, of course, wasnot the one desired. The "th" sound Is very difficultand never loud. The "r" is also hard to record clearlyunless it be rolled.

Music may be termed the universal language of man-kind, by which human feelings are made equally intel-ligible to all.-Liszt.

Little grains of dustOn the sapphire fixed,Make the music soundAltogether mixed.Little specks of dirtOn the the waxen roll,Is not the way to keepYour Records good and whole.

IHE NEW PHONOGRAM FOR SEPTEMBER, 1907

9629 Hungarian Dance, No.. 2Edison Hungarian Orchestra

This Hungarian dance by the celebratedtcomposer Brahms, is a companion to ourRecord No. 8502, " Hungai ian Dance, No.1," and is full of that strange, wild, fasci-nating music so characteristic of beautifulHungary, and so different from any othernation's melodies. A very pleasing effectis obtained by the introduction of the Hun-garian cymbals.

9630 Theodore Edward M. FavorThe amusing words and bright, catchy tune ofthis new comic song by Vincent Bryan will bringit into immediate popularity. Although ourstrenuous President is the subject, it is by nomeans a political song and should be as muchliked by Democrats as Republicans. Mr. Favor,fresh from his triumphs in "Fascinating Flora"at the Casino Theatre, New York, sings it in hiscustomary clear, vigorous manner. He is orches-trally accompanied. The chorus:

Theodore, the peaceful TheodoreOt all the rulers great and small,He's first In peace, he's first of all In war,He's In demand in Yankeeland, Hurray for Theodore.

9631 Many's the Time Collins and Harlan-his is one of those amusing coon.uets which these two artists ran-

t ; ;fittirtaitably, Mr, Hefiry BrownMis 'been' separated from his be-loved for some time and when hereturns he finds tifttt )(35,1, if not ex-actly blind, is at least shortsighted,for she does not remember him atfirst. It all ends up happily, how-ever, and they decide to get married. The wordsand music are by Rose and Fischer. Orchestralaccompaniment.

9632 When Someone Really Cares Irving GilletteThis sentimental song, the words of which areby Mabel Davies and music by William Cahill, issympathetically sung, with an orchestral accom-paniment. The music and words are suitable tothe theme and it should have a warm receptionamong lovers of sentimental ditties.

Club NewsThe next meet of the Niagara

Frontier Wireless Association isset for April 15th at the Old Am-herst Colony Museum, 500 Smith Rd.,East Amherst N.Y. 111051. Moreinformation with pictures nextmonth.

ZON-O-PHONE-Type B. No 60.

Same as Type A except that the sidesof the cabinet are of oak, with heavyraised panels, equipped with japannedsteel body, burnished brass bell amplify-ing horn, new model V sound box andtwo hundred needles.

The ZON-O-PHONE is not theGRAM -O -PHONE.

And when the Zon-o-phone once gotin its work, the poor old Gram -o -phonewas out of the running.

Please tote that fur the purpose ofthis article the terns Zon-u-phone impliesand includes,

1.-The Zan -u -phone machine itself.2.-'Lan-u-phone records made by the

secret and exclusive Zoo -o -phone pro-cess ;

3.-'Loll-o-phone machines and Zon-o-phone records use -I in combination.

Thus dehtic,l, The Zon-o-phone standsfor what iu the grand essentials of

d'an.,r,¡'owes

Con t,'rari/t /n /he ori,iu,rl,/icr,lour >i girt scratch,

is absolutely th; highest stage of dcvel-optncnt yet. reached by mechanism inreprottaci.'g sound.

WORDS `-ROA zoN0P110N800KJ-£T, -r;BOUT /900

MARTThe

Classified ad rate: 6¢ per word.Photo ads: $2.00 extra.

Deadline: 20th of the preceding month.

MISC."RADIO ACE," a radio magazine de-voted to wireless and early broad-cast eras. Contains interestingarticles written by collectors,articles published in early radiomagazines, lots of reprints offamous radio ads, and a classifiedsection for buying or selling radioand electronic items. Subscribe at$7.50 per year for ten issues.Mail check or money order to RadioAge, 1220 Meigs Street, Augusta,Georgia 309011.

FOR SALE OR TRADEOLDE TYME RADIO PARTS FOR SAIE:

Power transformer (brand new) $10.Thordarson, type 24ROZUPri: 117VACSec..l: 700VCT U 70 mo

2: 5VAC 4 2A3: 6.3VAC d. 2.5A

Filament transformer (brand

Pri: 117VAC new

Sec: 2.5VAC 0 10A

Tuning dial 6elts $2. ea./enith cloth fabric stylesend radio model No. andold belt or belt de-mensions.

Sun Gun type lamps (candlelabrabase) $2.50ea.

Photo lamps

Olde Tine battery cable $1.00/ft.Universal battery cable inbrown knitted cloth sheath.This cable can handle OldeTyme battery sets using upto 10 conductor leads.Just use as many conductorsneeded and cut off rest.

Electrol is capacitors2 of kl 1 OV .' Oea.

40-80 of .j 150V 1.00ea.32-12 Uf @ 1150V (can type8-8 of U 450V screw mount)3.5Oea.

All prices are as listed above plusshipping. Howard Granoff, Olde TymeRadio Company, 21145 Lyttonsville Rd.,Silver Spring MD 20910.

$5.

RIDERS RAI)I0 MASTER INDEXES:Vols. 1 to 15 $12.50: Vole. 1 to23 $15.00: Vols. 1 to 20 $111.00:EARLY RIDERS Vol. 1 1919-1927covers all battery sets, 200 pages,$$17.50.

RADIOLA BATTERY SET SERVICE MANUAL1922-1927 covers all battery sets85 pictures & diagrams $5.00.RIDERS Vol. 1 in 16 parts $5.00each, 50 to 70 pages each, order bymanufacturer parts 2 and 11 coversAK & RCA other parts cover 2 or moremanufacturers.NEW STYLE WD11 bases $6.00 per pair.Send SASE to K. Hanson, 31103 Broad-way, Long Beach CA 90803.

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

FOR SALE OR TRADE

ANTIQUE TELEVISIONS, 1930s - 1940slarge quanity. Over 50 sets. 3"Pilots. 7" Hallicraftors. RCA 630s.Will ship tc you. Send x$1.00 for

picture. Charles Seidel, 925Starlite, Grants Pass OR 97526.Telephone: 503 476-1078.

BLANK BAKELITE PANELS - Cut to size,1/16" to 3/8" thick. Fabricatingand engraving services available.SASE for pricing sheet.Parsons, WB7.BV0, 22 Forest St.,Branford CT 06405.

TUBES brand new, not surplus! Thesepopular oldies are factory guaranteedfor one year. 01A $7.95, 647 $3.80,6A8M $2.95, 6D6/78 $2.95, 6F6 $11.20,6KTGT $2.95, 24A $4.50, 26 $4.95, 27

$4.5o, 35/51 U.50. 45 $5.95, 58$3.30, 80 $2.98, 84 $2.00.Sale expires 5/1/78. Add $2.00 perorder postage and handling. FREEcatalog of over 1,000 tube types.Connolly, P.O. Box 1333H, Sun ValleyCA 91352.

FOR SALE OR TRADE: Tubes - Haveseveral hundred tubes for sale.Old and new types for radio andTV. Used and new - Cheap. SASEfor list. Bruce Harbeck, 1316 -38th St., Sioux City, Iowa 51104.

WD11 and UV99 adaptore. Use any UXbase tube $5.00 ea.pp., U.S.A., 2for $10.00 either type.AK brass thumb nuts as used onBreadboards and Mod. 20 sets, 10for $8.00pp. K. Parry, 17557 HoraceSt., Granada Hills C.* 913411.

FOR SAIE: Rider's Radio VolumesVI through XIV, 9 large manuals,fine condition, only $125.Lawrence Beitman, Box 46, High-land Park, II 60035.

SAIE/TRAEE: A -K 20, FreshmanKellogg others. Five page list.Dime & SASE. Chet Wisner,1014 Main St., Dalton MA 01226.

HAVE ANTIQUE RADIO & TV TUBES.Also some antique & old radios.Send 26¢ stamps for list w/prices.Harold's Radio, 3106 N. 3rd St.,Harrisburg PA 17110.

FOR SALE OR TRADE11

FOR SALE: STE`nrART-It:ARi , Model 801,

series B ingoo9,,,poOsi,tior,,ppityosk-ing, but withour, Original speakeror cabinet lid. Best offer or trade.fichael Nowicki, P.O. Box 21136, SanJose CA 95109

WANTEDWANTED: Control knob for Phil co 2"Safari TV, Sony 1" TV, ene, two, andthree tube Phiimore battery radios.DeForest Radic Home, WestinghouseAeriola Jr., Sr., Tusks expert tunertype 220, standard type 222.Darcy Brownrigg, Chelsea, Quebec,JOX 1NO Canada.

WANTED: Large lot external hornphonographs, parts, cylinder records,crystal sets, battery radios factorymfg., before 1926. Will pay $75.for mint Lambert Jr. Crystal set.Young, 11 Willow Court, Totowa,New Jersey 07512.

WANTED: Outside horn phonographswill pay X100 to :'1000 each.Don't advertise yours I krill prob-sbly pay more. Charles Seidel,925 Starlite, Grants Pass OR 97526.Telephone: 503 176-1078.

WANTED: DeForest tuning dials, asused on Interpanel set shown or.page 83 of "Vintage Radio," or will

the complete tuning unit, orany old DeForest parts.Ralph Maddox, Purgitscille W.VA26852.

WANTED: National SW -3 complete withpower supply and coils. Must bemint. WB1BV0, Norman A. Parsons,22 Forest St., Branford CT 06405.

WANTED: Schematic for Navy ReceiverCRV 116156 RAL-7, RCA. AR, 3 stage RFAmp. DA, I)ector, Amp. Wayne Wright,Pocahontas VA 211635.

WANTED: Power supply and knobs forRadiola 67. D. S. Voydanoff,1141 Yorkshire, Grossepointe Perk,Mtchigcn 48230.

WANTED: WIRE RECORDERS; Brush,Armour, Telographone or oddballtypes. H. Layer, AV-SFSU, 1600Holloway, San Francisco CA 94132.

WANTED: Any one out there who hasen extra Loose -Coupler for sales L.milar to those shown on page 153

in VINTAGE RADIO. Ralph G.Maddox, Purgitsville, W VA 26852.

WANTED: Automotive Radio items,any quantity. Cash paid.Marvin Roth, 111500 LaBelle, OakPark MI 48237.

WANTED: Kennedy, DeForest andMarconi sets. Trade or buy.Steve Large, Waldo WI 53093.(1111) 54144811.

WANTED: Zenith Stratosphre in verygood condition. Mark Mathison,103 S. Park, Medford, -!isc. 541451.

PU

ET

T E

LEC

TR

ON

ICS

PU

ET

T E

LEC

TR

ON

ICS

PU

ET

T E

LEC

TR

ON

ICS

PU

FT

TE

LEC

TR

ON

ICS

PU

ET

T E

LEC

TR

ON

ICS

H

PU

ET

T E

LEC

TR

ON

ICS

P.O

. BO

X 2

8512

DA

LIA

S T

EX

AS

152

28~

mas

«T

HE

CLA

SS

IC R

AD

IO N

EW

SLE

TT

ER

LIS

T N

O. 1

6A(s

end

131

tam

p fo

r ne

wsl

ette

r sa

mpl

e)

SC

HF

MA

T[C

D[®

Gl I

IIQS

WE

CA

N F

UR

NIS

H S

CH

EM

AT

ICS

ON

AN

YR

AD

IO (

1920

to 1

954)

-$1

. 50

'pos

tpai

dIF

YO

U C

AN

NO

T F

UR

NIS

H T

HE

NA

ME

OF

TH

E M

AN

UF

AC

TU

RE

R A

ND

TH

EM

OD

EL

NU

MB

ER

, SE

ND

TH

E T

YP

ES

AN

D Q

UA

NT

ITY

OF

TU

BE

S A

ND

WE

WIL

L R

ES

EA

RC

H O

UR

FIL

ES

FO

R A

SIM

ILA

R S

ET

WH

ICH

US

ES

TH

E S

AM

ET

UB

ES

-R

ES

EA

RC

H $

3. 0

0 po

stpa

id.

HO

W T

O O

RD

ER

11)

(2)

Mak

e ch

ecks

and

mon

ey o

rder

s pa

yabl

e to

PU

ET

T E

LEC

TR

ON

ICS

.W

E S

HIP

PA

RC

EL

PO

ST

. NO

C. O

. D.

INC

LUD

E 1

556

FO

R P

OS

TA

GE

&H

AN

DLI

NG

.P

OS

TA

L IN

SU

RA

NC

E R

AT

ES

AR

E 6

01 F

OR

OR

DE

RS

UP

TO

FIF

TY

DO

LLA

RS

,M

INIM

UM

OR

DE

R $

3. 0

0 -

DO

ES

NO

T A

PP

LY T

OS

CH

EM

AT

IC D

IAG

RA

MS

OR

BO

OK

LET

S. O

RD

ER

S W

HIC

H E

XC

EE

D $

50.0

0A

RE

SH

IPP

ED

PO

ST

PA

ID. T

EX

AS

RE

SID

EN

TS

AD

D 5

% S

TA

TE

SA

LES

TA

X.

PO

LIC

YC

US

TO

ME

R S

AT

ISF

AC

TIO

N G

UA

R A

NT

EE

D If

you

are

not

sat

isfie

d w

ithyo

ur o

rder

for

any

reas

on, t

ubes

may

be

retu

rned

with

in te

n da

ys fo

r re

fund

or

repl

acem

ent w

ith e

xcep

tion

of tu

bes

whi

ch a

re s

hort

ed o

r ha

ve o

pen

filam

ents

.It

will

be a

ssum

ed th

at r

etur

ned

tube

s w

ith o

pen

filam

ents

or

shor

ts w

ere

dam

aged

insh

ipm

ent.

Shi

ppin

g da

mag

e cl

aim

s w

ill b

e ha

ndle

d pr

ompt

ly th

roug

h th

e po

st o

ffice

on in

sure

d or

ders

.P

UE

TT

ELE

CT

RO

NIC

S a

ssum

es n

o lia

bilit

y fo

r or

ders

whi

char

e no

t ins

ured

, and

no

liabi

lity

beyo

nd th

at w

hich

is c

over

ed b

y po

stal

insu

ranc

e.T

he tu

bes

liste

d he

rein

are

eith

er n

ew, m

ilita

ry p

ull-o

uts,

fact

ory

over

-pu

rcha

ses,

or u

sed.

If on

ly n

ew tu

bes

in o

rigin

al c

arto

ns a

re a

ccep

tabl

e, a

dd 1

0% to

the

tota

lco

st o

f you

r tu

be o

rder

. RE

FU

ND

S a

re m

aile

d w

ith y

our

invo

ice

for

out -

of-s

tock

mer

chan

dice

.A

LL T

UB

ES

AR

E T

HO

RO

UG

HLY

TE

ST

ED

ON

A M

UT

UA

L C

ON

DC

T-

AN

CE

TU

SE

CH

EC

KE

R B

EF

OR

E S

HIP

ME

NT

, ALL

TU

BE

S M

US

T M

EE

T N

EW

TU

BE

ST

AN

DA

RD

S W

HE

N C

HE

CK

ED

.A

ll pr

ices

are

sub

ject

to c

hang

e w

ithou

tno

tice.

AU

tube

pric

es li

sted

her

ein

supe

rsed

e pr

ices

in p

revi

ous

lists

and

ads

.W

e of

fer

free

tech

nica

l adv

ice

for

a 13

1 st

amp

or y

ou m

ay c

all J

, W, F

. Pue

tt at

214-

279-

8309

NO

LA

TE

R T

HA

N 1

0:00

PM

CE

NT

RA

L S

TA

ND

AR

D T

IME

- P

LEA

SE

.

003

0Z4

lA1

IA3

1A4

IAS

1A6

1A7

IB4

155

187

158

ICI

105

IC6

1C?

1135

ID7

1E5

1E7

IF4

IFS

116

1E7

$2 $3 $5 $4 $4 $4 $3 $3 $4 $4 $4 $4 $4 $3 $3 $5 $5 $5 $5 $4 $4 $4 $4 $5

104

105

106

1H4

lH6

IJ6

IL6

1LA

4IL

A6

1LB

4IL

CS

1LC

61L

D5

1LE

31L

Fl

1LG

51L

H4

1LN

51N

51N

61P

510

5IR

S1.

55

1T4

$4 $4 $4 $5 $4 $4 $8 $4 $4 $4 $5 $4 $4 $4 $4 $4 $4 $4 $4 $4 $4 $4 $2 $2 $3

NE

WI

JUS

T O

UT

!!

1T5

1U4

lU5

1V 2A3

2A4

2A5

2A6

2A7

2137

2E5

2X2

3A4

3A5

3A8

3C6

3LF

430

53V

45.

424

5R4

5T4

5U4

5V4

5W4

5X4

5Y3

$3 $3 $3 $5 $7 Sr.

$a $4 $5 $4 $5 $3 $3 $3 $4 $4 $5 $3 $3 $5 $2 $2 $2 $2 $2 $3 $3

AN

TIQ

UE

RA

DIO

TU

BE

S

5Y4

523

524

6A3

6A4

6A5

6A6

6A7

6A8

6A54

6AB

76A

C5

6ÁC

76A

K5

6AL5

6AL7

6AQ

56A

T6

6AU

66A

V6

6AX

565

465

565

661

3765

86B

A6

6BE

66B

J66C

4

$3 $3 $3 $5 $6 $4 $4 $5 $4 $3 $3 $3 $3 $2 $3 $5 $2 52 $2 $2 $2 $5 $5 $5 S5

$4 $2 $3 $2 $2

p,N

T1Q

I)E

EB

ElB

TH

[69G

FO

! vliT

[OR

E R

. AM

O lF

ST

OS

®T

[O3[

6C5

6C6

6C7

6C8

6D6

6D7

6D8

6E5

6E6

6E7

6F5

616

6F7

618

605

6G6

6H6

635

676

637

678

6K5

6K6

6K7

6K8

6L5

6L6

6L7

6N5

6N6

6N7

6P5

607

$3 $4 $4 $4 $4 $4 $4 $5 54 $4 $4 $4 $6 $4 $5 $3 $2 $3 $2 $4 $4 $3 $3 $4 $4 $4 $3 $4 $5 $4 $4 $3 $4

PU

ET

T E

LEC

TR

ON

ICS

HA

SLI

ST

ED

HE

RE

IN, F

OR

OT

H

!EW

AC

O®

[S IV

110

105

LOS

TO

IA, 9

9, W

D -

11, e

tc. w

hen

in s

tock

,A

NT

IQU

E R

AD

IO S

ET

S A

ND

TE

ST

GE

AR

,A

NT

IQU

E R

AD

IO B

OO

KS

, AN

D O

TH

EP

."o

ne a

t a ti

me"

item

s--

list s

ent b

y fir

stcl

ass

mai

l fou

r to

six

tim

es a

yea

r by

sube

<rip

tion

--$2

.00

per

year

.

®A

LL

415T

TE

DIE

S s

end

for

cata

log.

TH

E P

UE

TT

ELE

CT

RO

NIC

S S

UP

ER

AN

TE

NN

A -

GR

OU

ND

SY

ST

EM

pla

ns $

2.

PU

ET

T E

LEC

TR

ON

ICS

(LU

ST

S-

zOO

ZS

& S

OO

ZLE

TS

(po

stpa

id)

(1)

TH

E A

CQ

UIS

ITIO

N O

F A

NT

IQU

ER

AD

IOS

by

J. W

. F, P

uett

$2.0

0(2

) T

HE

CO

MP

LET

E R

ES

TO

RA

TIO

N O

FB

AT

TE

RY

PO

WE

RE

D A

NT

IQU

ER

AD

IOS

by

3. W

. F. P

uett

$2.0

0T

HE

CO

MP

LET

E R

ES

TO

RA

TIO

N O

FA

C P

OW

ER

ED

AN

TIQ

UE

RA

DIO

Sby

3, W

, F. P

uett

$2.0

0(4

) C

OM

PLE

TE

LIS

T O

F A

NT

IQU

ER

AD

IO S

ER

VIC

ES

$2.

00 (

new

list

)(5

) W

HE

N W

AS

TH

AT

OLD

TU

BE

MA

DE

?by

Jam

es R

. Wilk

ins

$2. 0

0(6

) S

ILV

ER

GH

OS

TS

by

1, W

, F. P

uett

-

clas

sic

sets

by

E. H

, Sco

tt $1

0.00

(7)

MIL

ITA

RY

TU

BE

TY

PE

(V

T)

TO

CO

MM

ER

CIA

L T

UB

E T

YP

E C

RO

SS

-R

EF

ER

EN

CE

LIS

T $

1.00

(3)

UN

DR

ED

S O

F O

TH

ER

TU

BE

TY

PE

S N

OT

R T

UB

E T

YP

ES

, SE

ND

651

FO

R C

AT

ALO

G.

6R7

$4

6S4

658

6SA

76,

5E17

6SC

76S

D7

6SF

565

E7

6SG

76S

H7

6117

6SK

76S

L76S

N7

6507

6SR

765

5765

T7

6SU

76S

V7

6T7

6U5

6U7

6V6

6V7

6X4

6X5

6Y5

624

6Z5

6Z7

6ZY

57A

47A

57A

67A

77A

87A

E7

7AG

775

4

$4 $4 $3 $3 $3 $3 $3 $3 $4 $3 $3 $3 $3 $2 $3 $3 $3 $3 $3 $3 $4 $5 $5 $2 $4 $2 $2 $3 $3 $3 $2 $3 $4 $3 $4 $4 $4 $4 $4 $4

7B5

756

7B7

758

7C5

7C6

7C7

7E6

7E7

718

7G7

7H7

737

7L7

7Q7

7R 7

7S7

7V7

7W7

7X6

7X7

7Y4

724

10 12A

512

.46

12A

712

A8

12A

H7

12A

T6

12A

T7

12A

U6

12A

U7

12A

V6

I2A

X7

1213

712

8812

BA

612

5E6

I2C

512

C8

12E

512

H6

1235

12J]

$3 $4 $4 $4 $3 $4 $4 $4 $4 $5 $4 $4 $4 $4 $4 $4 $4 $4 $4 $4 54 $4 $3 $7 $º $4 $4 $4 $3 $2 $2 SO

S2 $2 $2 $4 54 $2 $2 $3 $4 $3 $3 $3 $4

1211

712

118

12L6

1207

1258

125A

712

SC

712

515

125E

712

SC

712

SH

712

117

12S

K7

12S

L712

5N7

1250

712

SR

712

V6

12X

412

2314

A4

14A

514

A7

1455

1456

1413

814

C5

14C

714

E6

14E

714

F7

14E

814

H7

1437

14N

7l4

Q7

14R

714

W7

14X

715 19 22 24

A25

A6

25A

7

$4 $4 $2 $4 $3 $3 $3 $3 $3 $3 $3 $3 $3 $3 $3 $3 $3 $3 $2 $2 $4 $4 $4 $3 $4 $4 $3 $4 $4 $4 $4 $4 $4 $4 $4 $4 $4 $4 $4 $7 $4 $7 $5 $3 $3

25A

C5

$325

136

$325

C6

$225

L6$3

25S

$425

25$3

25Z

6$3

26$6

26A

6$4

26A

7$4

27$4

28D

7$3

30$5

31$4

32$4

33$4

34$4

35$4

35A

5$4

3555

$235

C5

$235

L6$3

35W

4$2

35Y

4$4

3523

$435

24$4

3525

$335

26$4

36$4

37$4

38$3

39$3

40$7

41$4

42$4

43$4

44$3

45$6

47$7

48S4

49$4

50$7

S0A

553

SO

BS

$250

05$2

5006

$450

L6$3

50X

6$4

50Y

7$4

51$4

55$5

56$3

57$4

58$4

5956

70A

7$3

70L7

$571

A$7

75$4

76$3

77 78 79 80

$4 $4 $4 $381

$682

$383

$383

V$3

84$3

85$4

89$4

117L

7 $5

117M

7 $5

117N

7I1

7P7

1172

31l

7"24

1172

648

588

495

095

195

595

812

0112

0312

3212

7318

5218

5390

0290

0390

04V

R-9

0V

R-l0

5V

R-1

50V

T-5

2F

M10

00X

XB

XX

LX

XF

M

$7 $7 $3 $4 $4 $5 $7 $5 $5 $4 $4 $4 54 $4 $4 $3 $3 $3 $3 $4 $2 $2 $2 $5 $4 $4 $4 $4

FOR

Top

s in

Per

form

ance

EP

La10

E 4

08IA

ZO

R D

E/A

ZO

TE

A E

-5[!

BO

E! !

AID

[o

CA

TA

LO

G8

PA

GE

S

65C

or

five

13C

ST

AM

PS

TU

BE

S -

SC

HE

MA

TIC

DIA

GR

AM

S -

RA

DIO

BO

OK

LET

S

CA

PA

CIT

OR

S -

RE

SIS

TO

RS

- IN

TE

RS

TA

GE

&

PO

WE

R T

RA

NS

FO

RM

ER

S, S

PE

AK

ER

S, C

HO

KE

S,

DIA

L LA

MP

S, R

F C

OIL

S, I

. F. T

RA

NS

FO

RM

ER

S,

SW

ITC

HE

S, V

OLU

ME

CO

NT

RO

LS, D

RIV

E B

ELT

S.

TU

BE

SO

CK

ET

S L

AD

AP

TO

RS

, HO

OK

-UP

WIR

E,

DIA

L LA

MP

S, B

AT

TE

RIE

S, M

ET

ER

S, E

TC

.

PU

ET

T E

LEC

TR

ON

ICS

10 1

0121

112

1111

11 1

I111

7111

1

lw[

t111

I1t 1

1110

11a

11ili

fj

OE

t11

Nf?

Blih

ew.1

r3 T

.p/LIFT, uueaKuo,uwoo 8189

ezaptaurTas Q ,C.reg 2/.I

75c

1978

De

Fore

stT

he D

-i7

-A

is p

ictu

red

abov

e.T

he D

-17

has

the

sam

e ci

rcui

t but

the

spea

ker

is s

elf-

cont

aine

d.P

UE

TT

ELE

CT

RO

NIC

S P

UE

TT

ELE

CT

RO

NIC

S P

UE

TT

ELE

CT

RO

NIC

SP

UE

TT

ELE

CT

RO

NIC

S P

UE

TT

ELE

CT

RO

NIC

S