PL41010 EaCTRONICS LECTRONIC KISSMETER EE ELECTRONICS SECTION r"" 2 Mallory Mk1getrol TThe . Replacement .. 15 Control fi rst. 16 Line Quietest and Smoothest ... by Test ! THE SIZE IS NEW THE SWITCH IS NEW I Inn. in te' diameter, it easily services the increasingly No chance of failure -it's Mallory engineered and Mallory pa,pnlar small sets where ordinary controls will not fit. manufactured. Pushes on -stays on -and uy,rks. THE DESIGN IS NEW THE ELEMENT IS NEW Brand nr.. shaft le .I. saves valuable time in installation- More accurate oser -all resistance, smoother tapers, ample reduces inventor. -i nee one shaft lits all knobs. power dissipa THE CONSTRUCTION IS NEW THE CONTACT IS . NEW Extra quiet metal -metal -no -to contact between shaft Laboratory tests prove that the Mallory Midgetrol is the and cover or bushing. Special Mallory contact material. quietest control on the market. THE SHAFT IS NEW THE TERMINAL IS . NEW L nique -Iwo simple Igor all tittiut type knobs. No need tt on t break -twist enn§ all you want in close working for extra controls for difTemnl space. twat' fr panel to avoid shorting. THE EXTENSION IS . NEW THE SUSPENSION IS . NEW I.as. lo appl. Nith self -tapping Supplementary sirens. Two- point insures even contact pressure at all points of shafts available for installations wtni,li require them. rota . Larger bushing area -added support -no wobble. Side snips neatly cot U-dip furnished to slide Lae half the U-dip to Spring steel clip in- Extension shafts with shaft to length desired. over end of shaft holds hold push-on tvpeknobs. eluded for use with two self-tap //ping screws set-screw knobs. knurled knobs. available n'lattn needed. It's the NEW Standard in Carbon (Controls. See your Mallory distributor. a co tnc MALLOR CAPACITORS CONTROLS VIBRATORS SWITCHES RESISTORS RECTIFIERS VIBRAPACK' POWER SUPPLIES FILTERS R.a. U. S. Pat. Os. APPROVED PRECISION PRODUCTS P. R. MALLORY & CO., Inc., INDIANAPOLIS 6, INDIANA 3 I WILL SHOW YOU HOW TO START A RADIO SERVICE BUSINESS F,/f, 'c °' WITHOUT spa"ri nne CAPITAL J. E. SMITH, President National Radio Institute LEARN RADI:': t.; pArt or your ..raining you build this complete, powerful Radio Receiver that brings in KITS of local and distant stations. with BIG N. R. I. gives you ALI. the Radio parts . speaker, You Build This tubes. chassis, transformer, YOU sockets, loop antenna, etc. parts I SEND Radio Manu- Let me show you how you can Radio. Broadcasting, DER RADIO Radio Repairing. Public name Your own days . Your own factoring, Address Work, etc. And think of hours . as your own boss in your business. even greater opportunities in and Many Other Circuits own money- making Radio Electronics. I've trained hundreds of men to earn growing .v gold incomes in their own shops ... YOU PRACTICE with Gel Actual Lesson and Book Free this A. M. Signal men with no previous experience I Onerator, Pro- . and I can do the same for you. Art Nt \\" Sold fur my special tides amplitude. My unique train -at-home method DOUBLE i'Iti.E OFFER. Get actual ni ndniated makes learning easy. 1 send you lesson, "GET'T'ING ACQUAINTED YOU BUILD .this Tester that sig1lais for . manyny tests. BIG KITS of Radio farts. You get W'ITIi RECEIVER SERVICING," al.- you EARN EXThelpsRA MONEY fixing practical Radio experience building. sohttely free. Discloses short -enta used inhbors' Radios, in apure testing and experimenting with Ra- by Radio repair men to check and repair dio Circuits. You keep these valu- R111110 8. Over 80 pictures and diagrams! able kits to use in your own Radio Send now and also get my 64 -liage book, I Trained These Men business. "BOW TO BE A SUCCESS IN RADIO - TELEVISION - ELECTRON- GOOD JOB IN Make EXTRA Money In Spare Time ICS." See how quickly, easily you can started. Rut seed NOW! J. E. RADIO STATION YOU PRACTICE The day enroll, I send you get you II. President. Dept, 8J X, National "Am Bmadeast i.nr EXTRA MONEY booklets. Use your SMIIT Radia Institute, Pun «r Hoar oeer for St a t i;.t nR know -how to make EXTRA MONEY t W'aslt- K It (/ P. Fuud:unen- runip- fixing neighbors' Radios in spare Srnrh Radio Srhool. of Radio lut roui :ngen: 9. In C. tals ureut 111111 while From here it's in N. It. I. training lia; pana time learning. a short step to your own Radio shop ,; "- .IKltltï G. CIiLLET'r. 1 su.a. .... ,.I.,i.h. I, -., l'ali!uract. or a good-pay job in Radio ..ad Television industries. HAS OWN N. R.I. Traieed Mee Face Bright Future RADIO BUSINESS YCU BULO Think of money- making oppor- '., tunies in Police, Aviation. Marine Good for Both -FREE EXTRA CASI-I ACTUAL IN SPARE TI1stE MR. I. E. SMITH. President, Dept. 81X 1trued LESSON NATIONAL RADIO INSTITUTE, Washington 9, D. C. toue raJ,.t, t. : A for my s1ecinl I111UItL6 Mail nie FREE S mille Lesson and 64 -page book. t l".1 I I I 1 lt { t ai h- DO crt .e I. tins. 1 t No salesman will call. Please write plitinly.I T 1 I 'll 1 tti'l'tl Ril LlYl'It xc,, r.,. \ It free. in. I;e trau,.uu L,p'. u n in cho-k Age i i.:lt ,\ Caneret, 1:. ()ver OU l'clurv1 and .._.. ,... `.V \Vl Name 1 Address THIS TRAINING UNDER GET City Zone State f G. I. BILL. MAIL COUPON Check if Veteran. Approved For Training Under GI Bill. TERANS ,ate MM a0 as a- .0 ,ate am mit ata ,- WM amt ww a J SEPTEMBER, 1948 1 4 Hugo Gernsback, Editor -in -Chief Fred Shunaman, Managing Editor 1[ M. Harvey Gernsback, Consulting Editor AtIII0 Robert F. Scott, W2PWG, Technical Editor R. H. Dorf, W2QMI, Associate Editor I. Queen, W2OUX, Editorial Associate CRAFT Angie Pascale, Production Manager Elmer Fuller, Shortwave Editor RADIO - Wm. Lyon McLaughlin, 1:1.1:1:TINN1/:8 Tech. Illustration Director Incoreerat nn G. Aliquo, Circulation Manager SNORT WAVE CRAFT. TrLEVISION NEWSr John J. Lamson, Advertising Director ReOIO 6. T LrVISION rTrn,le.n..,k ,a:. .,.I I . r l':,., .l I.n.. Alfred Stern, Promotion Manager Contents September 1948 Editorial (Page 21) Soviet Radio Le"d.Tcrpedo by Hugo Gernsback 21 Electronics (Pages 22 -29) Kiss Meter -Electronic Osculat on Indicator (Cover Feature)... by Lyman E. Greenlee 22 Eclipse of the Radio Tube 24 The Crystal Detector, Part Ill by Jordan McQuay 26 Electronics in Medicine by Eugene J. Thompson 28 Television (Pages 30 -33) Video Alignment by Robert N. Vendeland 30 French Television Progress is Rapid by P. Hemardinquer 33 Servicing (Pages 34 -38) Radio Set and Service Review (Ward's Airline Models 74BR.2003A and 84BR- 1515A) 34 Regulating Voltage with VR Tubes by Richard L. Parmenter 36 Pepping Up Midgets by K. E. Stewart 38 Foreign News (Page 39) European Report Major Ralph W. Hallows 39 Audio (Pages 40 -43) Modern Phono Oscillators.... by Richard L. Parmenter 40 Two Channels for Hi -Fi by P. Hemardinquer 40 Instantaneous Interco. .... by Harold R. Newell 41 Three Bug -Free Amp'iiicr....... by John W. Straede 42 Test Instruments (Panes !S -:_) The A.C. Amme'rr S..ves testing Time. by John Melicharek 45 Tester Has New Features.... by V. A. Jeannot 46 Bridge Measures L -C -R by Rufus P. Turner 50 Amateur (Pages 54 -63) Four -Band Converter Has Crystal C'ntrrl. by Herbert S. Brier, W9EGQ Modifying the R- 44(ARR -5 oy L. W. May, Jr., W5AJG Relay- Controlled Ham Rig... by Richard H. Dori, W2QMI Construction (Pages 78 -81) Neon Lamp as Phototube by Robert Jonquet 78 Small -Space Metal Locator. by John Haynes 79 Communications T.R F . by T. W. Dresser 80 FM (Pages 87 -93) FM Station List 87 This year, as in every year since Departments 1939, more radio men will buy The Radio Month 10 Technotes ... 73 more Radio Business.. 16 Try This One 74 Sealdtite* capacitors than People 64 Radio -Electronic Circuits. ... ..... 82 any other molded paper capacitors. New Device- 66 Miscellany 85 New Patents 63 Book Reviews 94 Molded paper tubulars are indis- Question Box 70 Communications 97 putably the best for moisture re- RADIO- CRAFT, 1948, Stpttmker. Volume XIX, No. 12. l'ublinhrd r wW,ly on OW 9:111 of Imih prrredin.t dIA° sistance and long life. All- Purpose I.. , Ì ,.t If -,.,.. t.. ,.. I, , 11 -., i.ri .1.... I' I (1 Suety, l'inlay., Ipllia 39. l'a. } :nle,e.I us seismal. el,.. a1 ,allrl11 l'.rl 4)l,.', Sp, , Nias 11.14'1 \4't of March 3, 1s :3 Apl.ir01.1mr trni.(rr Io Pila -Temp molded drlphl l' a time . Hi Sealdtites are the RA DCRAFT PUBLICATIONS, INC. llugn Relish irk, Pres.; M. Malley Gen.nbark, Vire- Ires.; G. :lion°, Ser'y. fortin. l',n,), i: W, 191$. L) Itadr,at 1'04 ions. lue. Text and illustrations most not be reproduced without best molded tubulars. Once you EDITORIAL, ADVERTISING AND CIRCULATION OFFICES. 24 VVrsr Broadway. New York 7. N. Y. Tel. BE.ctor try them, you'll always buy them! eau. BRANCH ADVER, (SING OFFICES: Chicago: us W. W ,,hiuglon snrrt. 'trlrphaæ Randolph 78uá. Detroit: lt,.nu 1..2 l.rao:l,n, laoc.. _.,7o \ \est (:Laud Itn,l. Telephone Madison 7(1217. Los An- geles: Ralph W. Il :uiir,r, nun Souda hill St., Tel. Tucker 1793. San Francisco: Ralph W. Marker. 552 Market St., Tel.