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Electronics-World-1959-05 ELECTRONICS WORL12 MAY, 1959 VOL. 61 NO. 5 Publisher OLIVER READ, D. Sc., w1ETl Editor WM. A. STOCKLIN, B. S. Technical Editor MILTON S. SNITZER, W2QYI Service Editor SIDNEY C. SILVER Associate Editor P. B. HOEFER Assistant Edltor J. JUSTER Industrial Consultant WALTER H. BUCHSBAUM Art Editor MILTON BERWIN Art and Drafting Dept. J. A. GOLANEK A. J. LICHOTA, JR. JAMES A. ROTH MILTON WHELPLEY Advertising Di JOHN A. RONAN, JR. Advertising Manger GEORGE E. MORRISSEY Midwest Adv. Manager W. ROBERT WOLFE Weston Adv. Manager JAMES R. PIERCE ZIFF.DAVIS PUBLISHING COMPANY William Ziff, President; W. Bradford Briggs, Executive Vice -President; Michael Michaelson, Vice- President and Circulation Director; Hershel B. Sarbin, Secretary; Howard Stoughton, Jr., Treasurer; Albert Gruen, An Director. Editorial and Executive Offices One Park Avenue New York 16, N. Y. OR. 9.7200 e o z eut s*s Member Audit Bureau el Circulations 1,(1lII BRANCH OFFICES: Midwestern Office, 434 S. Wabash Ave., Chicago 5, III.; Western Office, Room 412, 215 W. 7th St., Los Angeles 14, Calif., James R. Pierce, manager. FOREIGN ADVERTISING REPRESENTA- TIVES: D. A. Goodall Ltd., London; Albert Milhado & Co., Antwerp and Dusseldorf. 4 _íir -s/ iu ru(io- /(w`i3ion -audio- eleclronicd CONTENTS ELECTRONICS- GENERAL Spot News Washington Editor 29 Induction Heating G W. McCook & Walter H. Buchsbaum 35 Melting Silicon for Semiconductors (Cover Story) 39 Recent Developments in Electronics 62 Tiny Vacuum Tube Rivals Transistor 100 Radio Sextant Tracks Moon 104 Electron Tube Crossword John A. Comstock 119 Missile Measurement Ship 138 Calendar of Events 155 HIGH FIDELITY AND AUDIO Loudspeakers for Stereo (Part 2) Norman H. Crowhurst 42 Hi -Fi Crossover Networks- Constructing the Network (Part 2) Abraham B. Cohen & Paul D. Cohen 49 Hi -Fi Crossover Network Design Charts 51 -52 Symmetrical T and H Attenuators (Special Chart) 53 Reactance Chart 54 Making & Using a Stereo Test Record Jerry B. Minter 56 Hi -Fi Product Test Report (ELECTRONICS WORLD Lab Tested) 59 "Stereo Master " -a Hi -Fi Control Center (ELECTRONICS WORLD Lab Tested) 64 Ultra -stable OTL Hi -Fi Amplifier Julius Futterman 69 Compatible Stereo for AM Stations 86 Hi -Fi -Audio Product Review 88 Sound on Tape Bert Whyte 95 Certified Record Revue Bert Whyte 120 Compatible Stereo Broadcasts 125 Experiments in Stereo for P.A. Systems Jack Thornton 128 TELEVISION -RADIO Prosperity and the Technician (Editorial) W. A. Stocklin 8 Electrical Shock: Fact and Fiction Daniel P. Peters 40 TV Shop Uses Two -Way Radio 45 Profit & Growth William Leonard 48 Mac's Service Shop John T. Frye 68 Service Association of the Month (ESFETA) 102 Save Time on Transistor Radios William C. Caldwell 112 Improving the A.C. -D.C. Radio A H. Fry 130 Another Day in the Shop Bob Eldridge 132 Service Industry News 139 Service Notes 142 TEST EQUIPMENT Generating Test Signals with Crystals Thomas Deane Herriman 66 Foreign Tube Substitution Data 106 AMATEUR Low -Level Clamp Modulator Marvin L. Gaskill, W2BCV 60 ELECTRONIC CONSTRUCTION Experimental Transistor Motor Control Harold Reed 46 DEPARTMENTS Letters from Our Readers 14 Technical Books 136 Within the Industry 24 Manufacturers' Literature 146 What's New in Radio 148 Average Net Paid Circulation 215,650 Radio a TV News Ibuliu News Teler,MUn News Truaemark, Reg. U. S. rat. 111f. Copyright A 1959 by Ziff-Davis Publishing Company. All rights SUBSCRIPTION SERVICE: Forms :(579 and all subscription correspondence should I.e addressed to Circulation Department. 434 South Wabash Avenue. Chicago S. Illinois. Please allow at least four weeks for change of address. Include your old address as well as new-enclosing if possible an address label from a recent Issue. CONTRIBUTIONS: Contributors are advised to retain copy of their manuscripts W and Illustrations. Contributions should he ailed n. the New York Editorial e(Mlice and fount he accompanied by return Inrstage C.mtribuliwn. will n mmllt.l reasonable care. but this m assumes responsibility for their afety. Any copy accepted Is sublect to whatever adaptations and r necessary m meet the requirements of this publication. Payment r all n tributor'e, revisions and co are title. end interest In sand to them er l accepted and win 1 . :n`:rt upon acceptance. All photos and drawings will be considered as part of tug rri.i t. i nl a ELECTRONICS WORLD

__ SOMETHING EW * HAS BEEN ADDED TO DEVRY TECH THE TRAINING P ROGRAM JOB Prepare THAT in Spare Time At Home PA for a REAL MONE TELEVISION-RADIO-ELECTRONI Many DeVry- trained men who now hold good jobs paying real money were once looking for opportunity, yet wondering if they needed advanced schooling, special experience, or higher math. They clipped a DeVry Tech coupon, mailed it in -and were pleasantly SUR- PRISED! Now they work in one of today's fastest -growing fields - TELEVISION -RADIO- ELECTRONICS. Many have their own profitable service shops. DeVry Tech's "Learn -by- Seeing," "Learn -by- Reading," "Learn -by- Doing" training made the difference! You, too, may train at home the DeVry Tech way with wonderful, helpful movies, clear texts and valuable home laboratory equipment -or in our well- equipped Chicago or Toronto Training Centers. Now something NEW' has been added to help you learn more by "doing." You can choose to build and keep your own top quality 6- speaker STEREOPHONIC SOUND SYSTEM that will provide thrilling enjoyment for years to come. Plans are furnished so that you can also build your own speaker cabinets -or we can tell you where to buy them. DeVry Tech's specially designed Stereo System includes: Turntable with Stereo cartridge Stereo Amplifier Stereo Pre -Amplifier 2 Cross -Over Networks *NEW! Build Your Own 6- Speaker HIGH FIDELITY STEREOPHONIC SOUND SYSTEM ... another wonderful DeVry advantage Special SHORT COURSE in High Fidelity Sound Reproduction including Stereophonic Systems also available. Ideal for hobbyists, music lovers and those wanting to ADD to their incomes. MANY OPTIONS! NOW ... DeVry Tech men can take their choke of any or all of the quality equipment shown above: The Stereo System ... the Scope and Meter ... a 21 -inch TV Set (not pictured) . . . or ALL THREE. But no matter which way you do it, you get practical home training at its best . . . the kind you need to get started in the fast -moving Electronics field. Send coupon for details. 1 ii Six Speakers: two 12 -in., two 8 -in., two 3 -in. When you build your own equipment, you learn about the working parts. You can repair, adjust, maintain. You learn by doing -the DeVry Tech way. You put basic principles into "on- the -job" practice. "One of North America's Foremost Electronics Training Centers" :3777ni 17, Accredited Member of ^' 7I 4 National Hon,. Study Council 1.00EIT OWN Real EMPLOYMENT Earnings I, SERVICE DeVry Tech offers real, ® down -to -earth employ - enr ce to help you toward a I good job offer graduation - even pro- vides help in starting your o wn servicing business. DEVRY TECHNICAL INSTITUTE 4141 BELMONT CHICAGO 41, ILL. Formerly DeFOREST'S TRAINING, Inc. SINtH coto. YcoPt VACUUM TU VOLT METE NCH BAND LOSCOP ET FRS BOOKLE T Clip p th pon ' w for b t answer y questions about your chances for success in this field. "Electronics and YOU" and the remarkable "Pocket Guide to Real Earnings" (just off the press) are yours without obligation. MAIL TODAY FOR FREE FACTS DeVry Technical Institute 4141 Belmont Ave., Chicago 41, III., Dept. RN -5 -P Please give me your two FREE booklets, "Pocket Guide to RealEarnings' and "Electronics and You," and ell me how to prepare to enter one or more branches of Electronics. NAME STREET PLEASE PRINT AGE APT. CITY _ ZONE STATE j_i Check here if subject to military training. DeVry Tech's Canadian Training Center is located at 2053 626 Roselown Avenue, Toronto 12, Ontario May, 1959 5

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