Vol. 9 DECEMBER, 1.944 No. 12

CORNELL-DUBILIER ELECTRIC CORP.HAMILTON BOULEVARDSOUTH PLAINFIELD, N. J.

VICTORY

BUYUNITEDSTATESWARONDSAND

STAMPS

Sec. 562, P. L.&R.U. S. POSTAGE

PAIDSo. Plainfield, N. J.

Permit No. 1

Mr. w, J. Morrice

-547 North v1.St .

M1LVaÁee, is.

WANTED!Case Histories of

Cornell-Dubilier Capacitors

HUNDREDS of Dubilier mica and paper capacitors

made over a decade ago and more, are still giving efficient

and reliable service in radio and electronic equipment. These

capacitors are as good today as the day they were made.

We are collecting case histories of such units.

If you know of a Dubilier capacitor ten years old or more,

in use today, please tell us all about it and in what type of

equipment it is used. A post card will do. Thank you.

Address:

EDITOR, THE C -D CAPACITOR

Cornell-Dubilier Electric Corporation,South Plainfield, N. J.

Page 2 THE C -D CAPACITOR

THE RAD10

A Free Market -Place for Buyers, Sellers, and Swappers.These advertisements are listed FREE of charge to C -D readers so if there is any-thing you would like to buy or sell; if you wish to obtain a position or if you have a

position to offer to C -D readers, just send in your ad.These columns are open only to those who have a legitimate, WANTED, SELL orSWAP proposition to offer. The Cornell-Dubilier Electric Corp. reserves the right to

edit advertisements submitted, and to refuse to run any which may be considered un-suitable. We shall endeavor to restrict the ads to legitimate offers but cannot assumeany responsibility for the transactions involved.

Please limit your ad to a maximum of 40 words, including name and address. Ad-vertisements will be run as promptly as space limitations permit.

FOR SALE-Radio tubes, 12SK7, I2SQ7, FOR SALE - Capehart DeLwre Record80, 6SK7, 6SA7, and others. Also parts, Changer, Jensen HF-18 speaker (ininstruments, etc. Send for list. John original case), 2A3 amplifier, RCA sig-Trowbridge, Dept C -D, 7935 Parnell, nal generator, and vacuum tube volt -Chicago 20, Ill. meter. Donald R. Barber, 422 N. WayneSt., Piqua, Ohio.WANTED-Good tube tester, also volt

meter. State price. W. J. Zahard, 3982E. 123 St., Cleveland 5, Ohio.

WANTED-Testing equipment, late modelpreferred. State make, model and price.W. B. Golden, 1017 Wadsworth St.,Decatur, Ala.

FOR SALE-Small lot of tubes in sealedcartons. OPA list; will sell the entiregroup only. 5Z3, 6A7, 6D6, 6K7, 6Q7,6V6, 80, 6SQ7, 6S17, 6X5. Success RadioService, 122 Motor Ave., Salt Lake City,Utah.

WANTED - Late mod. signal generatorand tube tester. State description, modeland price. Bill Corner, 111E. GardenSt., Pensacola, Fla.

WANTED-For cash or trade. Solar mod.CE, OCA, or BQC cond-tester. Superiorchannel analyzer. Have Webber mod.20 oscillator, Philco 088 sig. gen. bothall wave and battery power. Gems-bach vols. 1 and 2 radio manuals. RayParker, Kingman, Kans.

WANTED-Supreme tube and set tester504; Triplett signal generator 1632,Precision 920P; RCA test oscillator 167;Radio City signal generator. 702 andWeston 774, 778 or 776. State conditionand price. Cash waiting. Louis Fialkoff,143-48 41st Ave., Flushing, L. I., N. Y.

WANTED-Keystone projector mod 82 or75. Also sound head for 16mm films.Will buy Dodge 12v generator. HarryKay, Rt. 2, Box 255, Imlay City, Mich.

WANTED - Radio test equipment, sig.gen., set analyzer, tube tester, multi --meter or ohm meter for shop use. H. D.Gregory, 1157 So. Diamond St., Jack-sonville, Ill.

FOR SALE OR TRADE-Rider Manual 4 íngood condition. WANT Rider 2 and 13.Gerber Radio Repair, Box 112, Kamrar,Iowa.

FOR SALE-Supreme mod. 45 tube tester,$10. RCA mod. TMV I22B oscillograph,3", $75. This equipment in excellentcondition. Ralph Hunter, 12 North St.,Catskill, N. Y.

FOR SALE OR TRADE-Astatic FP -38 high-fidelity pickup, like new. $8.50 cash, ornew 902 cathode ray tube wanted. MyronB. Reynolds, Metcalf Research Lab.,Brown University, Providence 12, R. I.

FOR SALE-Two type WE212d tubes,used, but in fine condition. Will tradefor or buy the following: Audak D38Hpickup head or 0-200 micro amp meteror more sensitive movement. A/S A.Garcia, USNR V-12, Co. 5, P12, Albu-querque, New Mexico.

DECEMBER, 1944 Page 3

WANTED - Will pay any reasonableamount for octal tube and loctal tubecharts for use with C. W. Burton model20 direct reading tube tester. CharlesStuart, 4444 N. Sheridan Rd., Chicago40, III.

WANTED -2 broadcast band coils forHRO receiver. State condition and price.Karl L. Wagner, 3130 Cottage GroveAve., Des Moines, Iowa.

WANTED -Good signal tracer like RCAChanalyst or Vedolyzer; good signalgenerator (all wave) and a good setand tube tester. All must be late modelsand in good shape. A. Peart, 23 IvySt., Newark 6, N. T.

WANTED -Riders Manuals 1 to 12. Willpay cash or trade. Also want soundequipment, radio tubes and parts.Mackey's Radio and Record Shop, 307N. Spring St., Tupelo, Miss.

SWAP-Echophone EC -1 almost new for16mm projector or 8mm projector, orwhat have you. Jean Andraud, 452 E.182nd St., New York, N. Y.

WANTED -Nilson & Hornung Correspon-dence course in radio. Advise price,edition and number of booklets. H. P.Geise, 33-08 84th St., Jackson Heights,N.Y.

WANTED - Short wave communicationreceiver. Colt .45 automatic or revolve:-.38 second choice. Cash. Lt. C. R.Leutz, Jr., USMCR., VMTD-3, 3rd MAW,FMF c/o FPO, San Francisco, Calif.

FOR SALE -Supreme Vedolyzer 560A andSupreme signal generator mod. 561.Very little used. Both for $225. StanleyWand. 937 Vine St., Camden, N. J.

FOR SALE - Test instruments, suppliesand tubes. Here are a few: 6SA7, 6SK7,80, 12SK7, 12SQ7, etc. John Trowbridge,Dept. C -D., 7936 Parnell, Chicago 20,Ill.

FOR SALE OR TRADE -Carter 400v 250m.a. from 6v genemotor; Pioneer 300v100 m.a. from 6v gen -e -motor; FourJensen 12" PM 12C in Parabolic Baffles.Dumont 164 oscilloscope. WANT -Su-preme 582A sig. gen.; audio oscillator.Henry's Radio, 410 Thames St., New-port, R. I.

FOR SALE -RCA Midget radio, 5 tubes,12v, 50L60P, extra fine cabinet, $15.005 tube table radio, 47 output, needsrepair, $5.00. Will trade 6A7, 12A, 1A, 10tubes in cartons for other numbers, orsell at low price. Wanted-Ampmeter0-5v, DC. W. F. Onder, Rt. 1, Box 389,Kimmswick, Mo.

FOR SALE - Large quantity 1/2w Ohioinsulated resistors, practically all val-ues, $2.50 per 100 postpaid. Send cashwith order. A. H. Ferris, 2025 So. Fig-ueroa, Los Angeles 7, Calif.

WANTED -FM tuner or complete receiverin good condition. Will pay any reason-able price. Also have a Hallicrafter 5x28for sale. Best offer accepted. J. E. Duff,RD 2, Canton, Ohio.

WANTED -Four each of: 1A7GT, 1N5GT,1H5GT, 1LA6, 1LC6, 1LE3, 1T5GT, 1V,6A7, 6A8GT, 7A8, 12A8GT, 12K7GT,12SA7GT/G, 12SK7GT/G, 12Z3, 25B8GT,G, 25L6GT/G, 25Z5, 25Z6GT/G, 35A5,35L6GT/G, 35Z4GT, 35Z5GT/G, 35Z6G,45Z3, 45Z5GT, 50L6GT, 50Y6GT/G,70L7GT, 117L7GT, 117P7GT, 117Z6GT/G,43, 75. General Appliance Repairs,643 N. E. 1st Ave., Miami, Fla.

WANTED-Stancor Auto radio test anddemonstration pack, or similar unit.AVAILABLE - wood letters for radioservice signs, shaped and cut to suitany need. Radio Service, 24 8th St.Frenchtown, N. J.

FOR SALE OR TRADE -Small quantitytubes. Also Ultra -high frequency transceiver and 80 ft. No. 14 wire. Wouldlike to sell as one lot for $50 or tradefor Hallicrafters SX-25 Super Defiant,S22R Skyrider Marine, or similar com-munications receiver, plus cash balance.Dean O. Buchanan, 50 North University,Blackfoot, Idaho.

WANTED -1, 2, 5 and 6 Riders Manuals;mod. 164E 3" oscillograph (Dumont);mod. 920P or 920CP precision tube andset tester. New or new condition. VitalRadio Service, 209 Linden St., Camden,N. J.

WANTED -Riders Manuals 6 to 13, alsophono motor and pickup. Cash forsame. Lyle C. Newell, 113 E. ArrowWood Lane, Oak Ridge, Tenn.

FOR SALE - Lafayette 18-24w deluxemobile amplifier mod. 422, in orig. car-ton, $50. Instructions included. L. R.Battersby, 206 Branch Ave., Red Bank,N. J.

FOR SALE -Pilot Super Wasp receiver;plug-in coils 500-14 meters; NationalVelvet B pack, tubes, diagram. Tele-plex code mach, hand wound, 4 Morsetapes; Jewell voltammeter, DC .3, 3, 30150v .3, 3.5, 35, 350 amps. Leads. L. L.Creighton, 433 E. Bellevue Ave., SanMateo, Calif.

WANTED - Late mod. tube tester in goodcondition. Give description and price.George Murakami, 3303B, Newell, Calif.

(Continued on page 10)

Page 4 THE C -D CAPACITOR

CLEARING THAT INTERMITTENT*Repairing Those Intermittent Radio Receivers Can Be SimplifiedBy Following the Proper Techniques Described Herein.

Intermittents, it has been truly said,are the serviceman's Nemesis. Inspite of the advances made in serv-icing techniques, especially the intro-duction of cathode-ray tubes and "sig-nal chasers," this type of trouble stillwastes more of his time than all othersput together. Wartime lack of signal -tracing instruments has aggravated theserviceman's difficulties. So has thescarcity of tubes, which often bars theold technique of inserting a whole newset while checking over a receiver.

An "intermittent" is that type of de-fect that causes a set, otherwise nor-mal, to stop playing suddenly, or todrop greatly in volume. Turning itoff and on again, jarring or tapping it,or occasionally simply switching alight on or off in the room, is oftensufficient to start it playing again.Here is the main problem posed by theintermittent: When the serviceman at-tempts to localize the trouble, the setsprings back to normal as soon as heplaces the test prods across a sus-pected circuit. He cannot find thetrouble in a set which has nothingwrong with it!

The cause of intermittent cut-off orvolume drop is almost invariably apoor contact which becomes an abso-lute open because of a sudden surge orchange in the amount of current flow-ing through it. There are slight varia-tions; a tube -shield which makes in-termittent contact with the chassismay send the receiver into oscillationand thus cut off reception, but the un-derlying principle is the same even inthis case. Such poor contacts may ap-pear anywhere in the set, and in anycomponent. The trouble -making spotmay be in the antenna -coil or voice -coil, or anywhere between.

* By Y. Gabin in "Radio News."

Circuits carrying only r.f. currentsare the playgrounds of the intermit-tent. Poor contacts in the path of di-rect currents often show up throughcreating high resistance, burn out, ortend to weld themselves (though cer-tain low -wattage resistors give rise tobeautiful intermittents). They alsoare detected more readily by test instruments in such circuits. In the r.f.leads, the very minuteness of the cur-rents prevents any breakdown or self -healing effects.

The r.f. bypass condenser is the mostcommon hideout of the intermittent,though poorly soldered connectionsand poor friction contacts run it aclose second. Such contacts often arefound in variable condensers and tubeprongs. Intermittent opens or poorcontacts in the r.f. transformer sec-ondaries and variations in the highfrequency resistance of filter condens-ers, all have been found guilty of "killing the signal." The rule is that nopart of the set can be free from sus-picion, from power pack to cathode re-sistor, and from antenna to loudspeaker.

Another intermittent-or semi-inter-mittent-is worth noting. This showsup after the set has been playing forsome time and does not respond to theusual switching or shaking, but disap-pears after the set has been turned offfor a while. It is obviously caused byheat, and is easier to find, as the setwill remain out of commission whiletests are made on it in the "live" con-dition. It is mentioned only to pointout that many true intermittents arealso "thermals," but such small onesthat they may cool immediately whenthe set goes out of action, and be readyfor the slightest surge to put themback to work again. Indeed, the ac -

DECEMBER, 1944 Page 5

tion is sometimes automatic, and theset goes on and off periodically. Theauthor remembers one old '27 tubewhose filament used to open after ithad been playing a few minutes. Afterthe first cut-off, it would open andclose at regular 30 -second intervals,with wierd effects on the program.The trouble, of course, made itselfknown at once, and the tube was longkept in the shop as a curiosity.

Servicemen have three standardmethods of attacking intermittents.The oldest and crudest is to go throughthe set, checking all suspicious partsby removing or replacing, and playingthe receiver for long periods to makesure a cure is effected. This is a time -wasting and unsure procedure, but hasa few very good features. In certainmodels, bypass condensers are notori-

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Used to detect intermittents, thesignal tracer is hooked up across thatpart of the receiver under test. If atracer with an eye -tube is available,lead 4 may be hooked in at point G ofFig. 1. The eye will remain closed andsignals will come from speakers ofboth the set under test and the signaltracer. A failure of the signal appear-ing in the output of the set under test,accompanied by an opening of the eye,indicates trouble before the detector.Cessation of sound from the speakerwith the eye remaining closed showsthat the intermittent is in the a.f. cir-cuits. Should this be the case, the hotprod is attached to the grid of the out-put tube (point I), and the set playedtill it again fails. Should the speakerof the tracer continue to play, thetrouble is obviously in the output cir-cuits of the receiver, and points J andK should be tried next. If both speak-ers stop, the signal -tracer lead may bemoved back to the grid circuit of thepreceding tube, point G, and the proc-ess repeated.

The same method is used in the i.f.and r.f. circuits, should the trouble belocated before the detector. Usingleads 3, 2, or 1, the faulty stage is lo-cated. Once the trouble is localizedwithin the narrowest possible limits,the quick cure is to replace all con-densers and resistors which mightcause the trouble, sweat all joints andbrighten all contacts.

Even when using signal tracing,much time may be wasted and equip-ment tied up in some obstinate cases.Sets have been known to play eighthours per day for two or three dayswithout giving any evidence of fading,and to continue for a day or two inthe owner's home before starting tofade again. In some cases this is dueto different conditions in the home andshop. For this reason it is always well

to check on the voltage at the homelocation, and to ask if the fading oc-curs more often at a given time of day

often a valuable clue to voltage con-ditions. If a set refuses to "intermit"it is often a good idea to put a boxover it and let it get a few degreeswarmer than the surrounding air. Per-haps taking it out of the cabinet willimprove conditions..

The third method of attacking in-termittents-little used in the past-is to increase the line voltage to apoint where faulty components arelikely to break down under d.c. over -

Fig. 2. Many intermittents may be locatedeasily by operating the receiver at a linevoltage higher than specified. A higherline voltage can be obtained by connect-ing two transformers, as shown.

loads or heavier r.f. surges. One ofthe weaknesses of this system is thatit is quite useless against such defectsas a poor antenna -coil connection, andlittle better for pure r.f. circuits inother parts of the set. Where r.f. issuperimposed on d.c., it may work well.

The serious fault of this method isthat it makes a complete breakdownout of an intermittent. In many casesthere have been disagreements be-tween servicemen and owners over es-timates, the owner preferring to takehis set back rather than have it re-paired. Naturally, he insisted on get-ting it in the same condition as it waswhen he let it go to the shop. One badexperience with this technically excel-lent, but commercially embarrassingservicing method was too much for theserviceman.

Page 8 THE C -D CAPACITOR

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Now that the market is more in hisfavor, he can be a little bolder and ex-plain the situation to his customer.In most cases, if he stresses the sav-ing of time and money the method in-volves he will get a go-ahead signal.Neither is there now any necessity forthe check -and -estimate method in thecase of intermittents. The servicemancan make an estimate sufficient tocover the case before running anytests.

The apparatus used in the over -volt-age test is simple. An old toy trans-former, with taps up to 15 volts, is suf-ficient; circuit is shown in Fig. 2.Often a variable -primary transformermay be found in an old receiver. The117 -volt line may then be connectedacross the 100 -volt tap and the setcross the 120 -volt tan, giving a 20%

increase in voltage. Just to make thetest more gruesome, a sign flasher maybe inserted in series with the primary.A fuse just big enough to carry thecurrent used by the set should in allcases be used. There is no reason whybreakdown of a bypass condensershould be followed by burn -out of afilter choke or rectifier tube.

To repair an intermittent receiverin the shortest possible time, a judi-

cious combination of all three meth-ods is advisable. First, put in a set ofnew tubes, if possible. Then turn thechassis over and sweat any suspiciousjoints-or all joints carrying r.f. only.If the set is one in which fading isoften traced to certain bypass con-densers, these also should be replaced.Many servicemen replace the a.v.ccondensers in practically all old setsat this point, just as a matter of prin-ciple. This is often worth doing, forvery often "fading" is a fade in reverse-a leaky a.v.c. condenser takes thebias off the controlled tubes, and thevolume is turned down accordingly. Assoon as the intermittent condenserfunctions properly, the a.v.c. goes onwith a bang, and the volume drops,often below the audibility level.

The receiver may then be played onthe bench, while the serviceman goesabout his regular work. If it stillfades, it may he given an hour's runat a voltage of 130 or higher. Then ifnothing happens, the signal tracershould be called into play. The propercombination of all available methodswill conquer the intermittent with noserious loss of that now more -than -ever valuable commodity, time.

THE RADIO TRADING POST(Continued from page 4)

FOR SALE-Teleplex Jr. code mach. with5 tapes in carrying case, $5.00. PhilcoAuto radio in good condition for Ford1939. Make offer. Norman P. Eisnor,129 Summer St., Somerville 43, Mass.

FOR SALE OR TRADE-Camera, 35mmArgus A-2, case and accessories.WANTED - 35mm Argus C-2 or 3,Lecia or Kodak 35mm cameras, pocketVOM, NRI tester. Pet. Sterling W.Reed, 116th AAF-BU, Section T, AAB,Fort Dix, N. J.

FOR SALE - Test instruments: Suprememod. 550 radio tester, DeLuxe series,late mod. Superior dynamometer all volt-age tester 61/2 dial. Supreme mod 506tube tester. All sold for best offer, F.O.B.Rydholm Radio Service, 309 Main St.,Sauk Centre, Minn.

TRADE-Volland Analytical Balance en-closed in glass case l01/2x163/4"; 8 -string banjo and fibre case. Radio textbooks; Jewell 74-0-15 VAC meters forS. W. receivers, test equipment, meters,new tubes or what. Describe fully.Roby's Swapmart, 820 E. 61st St.,Chicago, Ill.

FOR SALE-Model 321 Triplett comb. AC -DC test from 15 to 750 volts; OHM metertest from 1500w to 1.5; Megohm signalgenerator. Gus J. Scuto, 25 NewberrySt., Lawrence, Mass.

TRADE-6AG7, 5V4, 5U4, 5Z3, 807, 1V,6A6, 6V6, meter -tested perfect, notboxed, WANT Astatic phono pickup,phono turntable (GI) and camera (2AAnastigmat or similar.) C. Wachspress,7815 68th Rd., Middle Village, N. Y.

Page 10 THE CT) CAPACITOR

FOR SALE - Weston exposure meter,Cine mod. 819, with leather pouch andneckband, very little used. Originalcost $24., or will trade as part paymenton any test instrument except VOMmeter or oscillator. P. K. Kallmeyer, 1511145 Place, Whitestone, L. L, N. Y.

SWAP -$150 RCA mod. FAX -2A FacsimileBroadcast receiver in Al condition forlate mod. Royal or Corona port. type-writer in similar condition. RobertStevens, 536 Johnson Court, Canton,Ill.

WANTED -New or used RCA TT5 5"television table receiver. Must be readyto operate with operating booklets.State price. H. M. Benham, Jr., 16Wakefield Place, Caldwell, N. J.

WANTED -Cash paid for new or usedpower shifters 11/2 or 2 volt from 110 AC.Tubes for swap -(no cash.) O1A, 6SC7,6K5, 14R7, 6SQ7, 1T4, 155, 5Y4. WatersRadio Service, Box 12, Oneida, Tenn.

WANTED -Small table receivers. Neednot be in working order, but all partsmust be intact. Write stating make,model, condition, etc. O'Brien's Radio,609 W 1st, Fulton, N.Y.

FOR SALE -At OPA list price: 1A4, 105,1E7G, 1LB4, ILH4, 1N6G, 3Q5, 5V4,6A6, 6A8M, 6B4G, 6C5, 6K7M, 6N7, 6SA7,6R7M, 6SK7, 6V6, 12A5, 12SK7, 25L6,35Z3, 45, 53, 75, 80, 81, 82, 84, 117L7,and 117Z6. Guaranteed. Sold in lot only.Goodwin Radio Shop, Rankim, Ill.

WANTED -Television equipment, receiverstransmitters, cathode ray tubes, cono -scopes, etc. Will pay good prices. Senddescription and price. P. O. Gorgenson,1437 W. 41st Ave., Vancouver, B. C.,Canada.

FOR SALE- Supreme 592-593 multimeterand analyzer; RCA Auto radio 67M3(dual speaker); Weston 682 tube check-er; Supreme 189 signal generator; 37" PM speakers; Astatic pickup; turn-table in carrying case. 2 6v -180v dyna-motors; homemade ham receiver withcoils and speaker; Hammerlund Cornetreceiver. Milton Wendroff, Sl/c USN,1745 E. 16th St., Brooklyn 29, N. Y.

FOR SALE -RCA 150 oscillator and 151scope. Instructograph, Jr., Riders from3 to 9, Radio News magazines, June 36to date. QST January '39 to December'41. Centralab Standard centrals andswitches. Heavy duty mike stand. woodlathe. Howard Abernathy, Batavia, Ia.

FOR SALE -100w transmitter parts in-cluding power supply, tubes, coils andcrystals. Also a monitor. Also 2-10 tubesand 2-100mfd. Hammerlund variablecondensers for sale. Bou Radio Service3131 N. Percy St., Phila. 33, Penn.

FOR SALE OR TRADE -RCA Voltohmyst,Jr.; Leeds and Northrup fault finderwheatstone bridge; 0-lmil. Triplett meter301 type; Shure Unidyne RDA 55 mike.Want small screw cutting lathe, 35mmcamera or audio oscillator. John North,140 Sheridan Blvd., Inwood, L. I., N. Y.

FOR SALE -Custom built remote broad-cast amplifier, 3 position mixer, lowimpedance inputs 4 stages, volume in-dicator, key switches for 150 or 500voutput, key switch to change from onetelephone to another.Originally built fora Mutual station, $60. WMPJ, 37-61103rd St., Corona, N. Y.

FOR SALE -New HY615 and 9002 raditubes. Fox Sound equip. Co., 435 So5th St., Richmond, Ind.

FOR SALE- Meissner 5 -band coil assem-bly 13-7617, for 280 Mmfd condenserBrand new $30. prepaid. Roy Y. Nakano,7113B, Tule Lake Center, Newell, Calif.

WANTED -54Z3, new or goad used, orwill swap any of the following for same12B8, OZ4.6x5, 12SA7, 35L7, 6SC7, 6L6,or any one pair. Arthur A. Hale, 357East Park Blvd., Akron 5, Ohio.

FOR SALE -Hydraulic Absorption Dynam-ometer also 8 -wheel electrically oper-ated Locomotive Crane, standard gaugeR.R. tracks -both like new. Wt. ofDynamometer, 1200 lbs. Wt. of Crane,145,000 lbs. Price of Crane $17,000. Priceof Dynamometer $750. Maurice S. In-dursky, Rm. 2202. Hotel Paris, 97th St.and West Eud Ave., New York, N. Y.

FOR SALE -RCA Victor R32; RCA AC46RCA 2 DC chassis; GE table mod. K32and speaker; Majestic 370 table mod.and speaker; Majestic 90B and 90 speak-er; Fade chassis; Baldwin chassis.Philca mod. 111 Superhet and speaker.Louis A. Goldstone, 1279 Sheridan Ave.,Bronx 56, New York.

FOR SALE-Ansco Memo Camera 35MMwith case; Eastman Folding 3A postcard size camera; electric hair clippers;Colemont Paris binoculars prism 8 pow-er with case. Make offer or will tradefor testing equipment or short-wavereceiver. Glenn Watt, Chanute, Kans.

DECEMBER, 1944 Page 11

WANTED -For cash new sealed in cartons12v or higher volt tubes. State priceand quantity. Leading Radio Service,114 East Third St., Mt. Vernon, N. Y.

WANTED -For cash: Riders vols 6, 10, 11,13; must be in perfect condition. Alsolooking for good output meter. GilbertRadio Shop, 1296 Sheridan Ave., Bronx56, N. Y.

FOR SALE -Two type 34, two type 30 andone type 19 tubes. New. W. Freising,1702 6th St., Rensselaer, N. Y.

FOR SALE -Tube kits, all new in sealedcartons. Each kit contains 5Y3GT, 6V6GT(2) 5U4G, 45, 80, 6H6GT, 6D6, 84, 1R5 or1T4, 1F6 or 89, 79 or 14AF7, 12SK7GT,12SL7 or 12SC7, (2) 6L6GT, 6E6 or 6D7,6SK7GT 6F5GT, 26. 30% off OPA list.Send check or money order to SteinRadio, 7 Monroe St., Mt. Vernon, N. Y.

WANTED -Radio tubes, parts, any surplusradio stock you have. Will buy testequipment if reasonable. Best RadioShop, 3349 Fulton Rd., Cleveland 9, O.

FOR SALE -National N C 100x5 commun-ications receiver with general coveragecoils including broadcast band up to 10meters. with crystal filter and Rola G12Hi -Fi speaker. In excellent condition.$150.00. F. Craven, 2216 So. 7th St.,Philadelphia 48, Pa.

FOR SALE -30 asst. output and inputtransformers p.p. and single, some newin original cartons, all good sizes. Bestoffer takes lot. Two 220v line 6.3v, 5.0v,650v, 70 mil. X'formers. One 32v to 110volt rot. converter, several 6v vib.packs with vibrators. All types of mini-ature tubes. List price. Radio Labs,Hudson, Wis.

WANTED -New or used test equipmentin good shape. Also first 13 vols ofRiders manual. Also tube tester, cond.tester, oscillar, volt meter, good paintgum. Also standard tubes. Will paycash. Ellison Radio Service, 211 WestMain St., Sedalia, Mo.

WANTED -Photo items, tank, printer, en-larger, exposure meter, tripod, 8MMprojector, plate and film cameras, tilt -tops, photo books, lenses, flashgun -Trade for AC tubes, AC -DC filters, cab-inets, and cash. Gerald Samkofsky,527 Bedford Ave., Brooklyn, N. Y.

WANTED-25Z5s or 50L6s or 12SA7 orsmall radio, portable or table model.

Musu, 206 E 40 St., New York, N. Y.

WANTED - Superior 1230 or PrecisionE200 signal generator or other make.Quote price and condition. Also wantRiders Manuals. J. Erichowsky, 501E. 11 st., New York, N. Y.

FOR SALE -Howard 435A com. receiver,used 2 months. RCA 6 tube super P.A.tuner, $25. Super P.A. tuner, workingorder, $18. G.I. port. record changerwith astatic pickup, $25. Will accept1A7, 50L6, 35L6, 7A8, sealed, as partpayment. B. M. Kates, Woodbridge,N. Y.

WANTED -585 Supreme Diagometer tester,Riders Manuals 1 to 8; Drophead port.Singer or other good make sewingmach; port. Royal typewriter; signalgenerators; massage vibrators; HanoviaLuxor S ultra violet generators; Dia-thermy or S. W. machines. Louis A.Goldstone, 1279 Sheridan Ave., Bronx56, New York.

WANTED-70L7GT and 25B8GT radio tubesWilson Chastain, 928 Broad St., Nash-ville 3, Tenn.

FOR SALE - Westinghouse 3 -in. panelinstruments, 0-500 milliamperes DC, 0-3amps. AC, 0-250v AC, $12. ea. GE 6 lb.pull PA in. stroke 110v AC solenoid, $15.Advance series 300 time delay relay, $10.Galanty, 287 Conklin, Hillside, N. j.

TRADE -.22 H & R Sportsman, .22 Reming-ton Target Master, both in Al shape,8 boxes .22 cartridges S.HP., 4' steelcasting rod, Akron reel, 10 casting baits.WANT model makers metal lathe, spin-dle shaper, jointer, drill press, woodlathe, jig saw. G. E. Pilgrim, Box 514,Forest City, N. Carolina.

WANTED -Supreme 570 signal gen. and592 multimeter in good condition. Stateprice. Thos. D'Addario, 13545 117 St.,Ozone Park 16, N. Y.

WANTED -"Fisher" or equivalent mineraldecator radio outfit commonly calledTreasure locator radio. Earl Heiser,122 Whitefield Ave., Ocean Grove, N. J.

WANTED - Supreme 546 oscilloscope,vedolizer, 571 or 561 oscillators, Triplett1200E VOM and Dumont 'scope, latemodel. State price and condition.Leonard D. Chioma, 24 Central Ave.,Tarrytown, N. Y.

WANTED -885s, 884s, or 2051s, new orused. also full or half wave copperoxide meter rectifiers. Cash or swap.Z. T. Bogar, Rt. 1, Box 286, Laurel, Md.

Page 12 THE C -D CAPACITOR

WANTED-RCA Junior Voltohymst type165A. Your price for one in factory -sealed carton. Wm. Dressler, 2030 71stSt., Brooklyn 4, N. Y.

WANTED-Riders Manuals 4 and 5 only.Must be 100% O.K. Have many tubesfor swap or cash. Millhurst Radio,Freehold, N. J.

WANTED - RCA Rider Chanalyst orMeissner Analyst, new or used. Alsosignal generator. Robert Vannini, 80Norman St., Springfield, Mass.

WANTED-Tone Arm for R.C.A. Viscaloidpickup stock 34710 (U110); bridge cop-per oxide rectifier for 0-1 Millimeter.Weston 3" 0-150 millimeter; Weston 3"0-1 millimeter; R. F. Triple choke forAetna 6 tube all -wave radio; Philco116X chassis. Murray J. Douglas,W6CUG, Concord, Calif.

WANTED-Back issues, all years of C -DCapacitor, The Aerovox Research Work-er, RCA Radio Service News. Stateprice. Wm. Dressler, 2030 71st St.,Brooklyn 4, N. Y.

FOR SALE OR SWAP-Sonotone bonecontact hearing aid with meter to testbatteries. Working cond. Needs batter-ies. Sell for $35. cash or swap for anyof the following: Radio test equipment,cathode ray tubes 5 in. or larger, tele-vision parts or kits, high voltage powertransformers, G. I. Recorder, recordchanger. F. U. Dillion, 1200 North OliveDrive, Hollywood 46, Calif.

WANTED - Triplett Modulation Monitor1696A Hallicrafters HT7 frequency stan-dard. R.M.E. LF90 inverter. MeissnerDeLuxe signal shifter. Abbott TR4. 300wclass B multi match modulation trans-former and driver transformer to match.Please state age, model, condition andprice. Walter Kryger, 912 W. 151 St.,East Chicago, Ind.

WANTED -110v AC generator to mount onFord V8 Motor. State price and condition.Don Leibrand Radio Service, Scobey,Mont.

FOR SALE -100 new tubes, sealed in car-tons at OPA list; 200 good tested usedtubes at 30% off OPA list. What do youneed? H. Mason Radio, 114 E. 3rd St.,Mt. Vernon, N. Y.

FOR SALE-Jackson oscilloscope model523, excellent condition. Wm. A. Conk-lin, 70 Community Drive, Cranston 5,R. I.

WANTED-Old radio receivers built after1930, such as Philco, RCA Victor, etc.,(no Atwater -Kent or Majesties). Will ac-cept whether working or not. Stateprice. Don Anderson, 917 East KempAve., Watertown, S. Dak.

WANTED-Late model tube checker ingood condition, also 0-1 milliammeter ofreliable make also small electric drill.Cash on description. Charles Lentz,2300 Bronx Park East, Bronx 67, N. Y.

POSITION WANTED - Young man, 21,with 4 years electrical -radio trainingand still taking N.R.I. radio course,wants position in radio repair work,within N. Y. City, Salary open. F.Teicher, 717 E. 175 St., New York 57,N. Y.

FOR SALE-Western Electric radio, smallconsole battery set, complete with tubesand batteries, $20. Also hearing aid,$10. Also recorder and playback unit,brand new. Taubers Radio Shop, 516So. Cicero Ave., Chicago, Ill.

WANTED-Late model tube tester that willtest loktals, VOM. Also voltmeter ingood condition. Write complete des-cription and price. Paul W. White,Kingsport, Tenn.

FOR SALE OR TRADE-Jackson 580 Dy-namic analyzer; OSC mod. 540; oscillo-scope 3" CE solar condenser analyzerwith VTVM. Xtal standard 100,600 kcand 2000 kc. Tiny RCA freq. mod.WANTED -200 or 300w phone xmitter.Com. short wave receiver 5x16 -5x28,RMC 69; Hickok mod. 155 traceometeror RCA Rider "Chanalyst." GeraldHess Radio Service, Moravia, N. Y.

SWAP-35MM movie proj.; 16MM prof.;Midas 91/2MM camera-praj.; severalradios, RCA service course; pipe stockand die; QST and other magazines;meters. photo enlarger and other equip-ment; rotary converter. WANT-Lightingplant; gas refrigerator; electric sewingmachine; power cultivator; 35MM stillcamera; exposure meter. Joseph Leeb,1380 Merriam Ave., Bronx 52, N. Y.

TRADE-Wireless phono oscillator, h. f.buzzer and key, sports glasses, ice andand roller skates, box camera. WANTtubes, parts, harmonica. J. M. Kilroy,9 Christopher St., Dorchester 22, Mass.

WANTED-For cash-Good 3" Cathoderay oscillograph. Prefer Dumont 164E;Also mod. 188X Hickok signal genera-tor or other good used. Arthur Frank,101 Becker St., Syracuse 8, N. Y.

DECEMBER, 1944 Page 13

FOR SALE -Set of Riders Manuals, likenew with original boxes. Vols. 1 to 5abridged and 6 to 13 with index, etc.Also Riders Record Changer. Mrs. Wm.C. Exelhy, 1204 W. Allegheny, Austin,Minn.

WANTED-Volt-Ohm-Milliammeter, Triplett1200A, or 666, or any pocket type. Statecondition and price. Tony's Radio, 5211Southwest, St. Louis, Mo.

WANTED -Any quantity new 1A7, 7A8,7B7, 12A8, 12K7, 12SA7, 12SK7, 12SQ7,35Z3, 25Z5, 25Z6, 35L6, 50L6, 47, 6Q7G,6R7G. Send list Eugene Kurseth, 822Sixth Ave. South, St. James, Minn.

WANTED -Late model tube tester (rollchart preferred), good signal generator,set of Rider Manuals, VOM, and whathave you. Everett L. Sawyer, 521 Grin-nell St., Key West, Florida.

WANTED -RCA Chanalyst in good con-dition. Will pay cash. John Grabowski,6647 Clayton St., Detroit 10, Mich.

FOR SALE -Many new tubes -24A, 6L7,85, 7C5, 6N6G, etc. Weston 0-20 mil. DCmeter, many parts. Do not ask for listunless interested. Frank's Radio Lab.,New London, Iowa.

FOR SALE -Triplett mod. 1601 analyzer.DeLuxe set tester in new condition,$65. Also Solar condenser tester andcapacitor -analyzer in new condition,mod. CB 160, $35. James Covington,249 W. 131 St., New York 27, N. Y.

FOR SALE -Million mod. SY signalizer,like new, $35. 2v 135B supply and 11/2v90B supply ac power packs, new, $13.50ea. 140w l tip Drake soldering iron,never used, list $7.50. Will ship C.O.D.A. 13. Eatherly, 1504 Bernard Ave.,Nashville 4, Tenn.

FOR SALE -Back numbers of radio andmechanical magazines, Radio Craft,Radio News, Short Wave Craft, PopularMechanics, Popular Science, etc. Alsoradio and electrical books. AubreyEdgerton, 116 West 6th Ave., Houston7, Texas.

WANTED -All kinds of radio test equip-ment, analyzers, etc. Quote what youhave to sell and price. Mercury Appli-ance Co., 6501 18th Ave., Brooklyn,N. Y.

WANTED -Rider Chanalyst. Will pay $100.if in A-1 condition. E. A. Redmon,Ellinwood, Kansas.

WANTED -Outboard motor about l0h.p.or larger, not particular of condition.Will pay cash or trade Riders Manuals.Give make, year and condition. AlsoNeptune 10A10 outboard for parts.Ward McDonald, Grampian, Pa.

WANTED -Radio City tube and set tester,mod. 804 or equivalent. Also port. typeRadio City multitester, mod. 446AP, oranything with similar ranges, especiallySimpson mod. 215 and AF and RF sig-nal generators. Glenn Zimmerman, Box77, Barton, Wis.

FOR SALE -Gardiner rosin core solder,round on 1 lb. spools, r's" thick. Have13 spools. Will trade for 12v tubes inoriginal cartons. Guaranteed Radio Ser-vice, 2451 So. Kedzie Ave., Chicago 23,Ill.

FOR SALE -Tubes -12A6 can be used assubstitute for 35L6, 50L6, 35A5, andothers, complete with lOw resistor, $2.Also other tubes, power transformers,volume controls, etc. Sid Diamond, 2381/2W. 70th St., Los Angeles 3, Calif.

WANTED - For cash, cameras, smallradios, photographic accessories, meters,record players. odd clocks such aschina, cuckoo, mantel, chimes, shipclocks, brass, etc. Gerald Samkofsky,527 Bedford Ave., Brooklyn, N. Y.

FOR SALE -Camera Kodak Special 616,f4.5 speeds 1 sec. to 1/400, delayedaction, like new; camera case; sun-shade; red filter; yellow filter; Orangefilter; Xl green filter; B green filter.all new. $50. takes all. RasmussenRadio, 91-37 184th St., Jamaica 3, N. Y.

FOR SALE OR TRADE -Superior model1230 signal generator, never used but afew times, $12.50 cash or will swap forhard to get tubes up to the value ofsame, net. L. E. Heath, Ellerson, Va.

FOR SALE -RCA Model 154 beat frequ-ency oscillator. New six months agoand in perfect condition. $50. FoxSound Equipment Co., 435 So. 5th St.,Richmond, Ind.

FOR SALE - Set signal training probes,auto radio, phono radio comb., S andD. B. mikes, radio mags., books,etc. Send for list. Harry Kay, Rt. 2,Box 255, Imlay City, Mich.

NEEDED -For school training class. Meiss-ner F. M. Tuning assembly and I. F.coils for same. Send description andprice. Fred Rouse, 5 Euclid Ave., Cort-land, N. Y.

Page . 14 THE C -D CAPACITOR

FOR SALE-Heavy duty rectifier packmfg. by Todd Transformer Corp., uses4-5 amp. tungars, compl. with tubes,delivers up to 10 amps. 110v DC. Cost$150. Wt. 100 lbs. $35. takes it. JosephBlock, 108 E. 51st St., Brooklyn 3, N. Y.

FOR SALE-Three Turner mod. 33D Dyn-amic Mikes, $21.50 ea. Four Heavyduty floor type Mike stands, $14, ea.Three EI2P Utah 12" PM speakers, 20oz. mag. $11.60 ea. Three G12P Utah12" PM speakers, 46 oz. mag. $20.John J. Spankowitch, 239 No. 9th St.,Allentown, Pa.

WILL SELL - RCA phono-oscillator withsmall mike, complete schematic andwiring diagrams included; range 900-1200 kilocycles. Used about 10 hours.Will sell for $5.00. F. J. Timka, Jr.,1211 Park Ave., Rochester, N. Y.

WANTED-Late model tube tester, sig.gen., voltohmeter, condenser tester;also 2 -speed recorder and playback,and Rider's Manuals. Lew's RadioService, 233 S. Conn. Ave., AtlanticCity, N. J.

FOR SALE-Stancor A pack, new, Master,$50; Remington rifle, new condition,$20.00, pump action .22 cartridge. t/4h.p. G.E. electric motor, .A-1, $10.00;Philco 1941 auto radio, new, $45.00.Paul Capito, 637 W. 21 St., Erie, Pa.

WANTED-Precision 920P tube and settester or Supreme 504A tube and settester, Hickok 188X signal venerator orHickok 510X tube set tester. Will paycash or trade new Rider's Manuals, 7,8, 9, 10, 11, 12 and cash. Leon S. Schall,160 Abbott St., Plains, Pa.

Important

Notice to C -D Capacitor Users

When ordering urgently needed replacements,either A.C. Electrolytics for motor -starting purposes,or A.C. Dykanoii Units for split -phase motor use orD.C. Dry Electrolytics for Radio Set Repairs, pleasebear in mind that your exact requirements may notbe available, in your jobber's stock, at this time,so be sure to state whether or not you will accepta similarly rated unit electrically, but slightly dif-ferent in size physically. This situation will exslstuntil after the National Emergency, as you maynot be able to furnish proper priority rating to ob-tain items not in stock and which have to be fab-ricated.

Cornell-Dubilier Electric Corp.South Plainfield, New Jersey

DECEMBER, 1944 Page 15

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MICA PAPER DYNAIOLWET AND DRY ELECTROLYTIC CAPACITORS

E L E C T R I C CORPORATION10E9 HAMILTON BLVD. SO. PLAINFIELD, N. 1.

MORE IN USE TODAY THAN ANY OTHER MAKEp,..sU.S.A