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Radio-Electronics-19 PORTABLE SCINTILLATION COUNTER FEBRUARY 1956 K isvr".14 TELEVISION SERVICING HIGn FIDELITY In this issue: How t) Construct a Hartley "Baffle" Easily Built Echo Unit Transistorized Scope Calibrator Remote Control for the 630 35 U. S. and CANADA A "Three-Way" Bicycle Radio (See page 4) www.americanradiohistory.com No one piece of equipment can do more for you. As the electronic field expands your tube tester must do more. TRIPLETT TUBE TESTERS meet this demand. More heater voltages including 3.15, 4.2 and 4.7 volts for 600 mill series string heaters. Quickly locating the bad tubes saves time. Tube sales can be a profitable business in itself. S0% OF YOUR SERVICE JOBS CAN BE COMPLETED WITH A TRIPLETT TUBE TESTER NEW Triplett model 3413 -B combines provision for conventional UNIQUE AND ONLY $79.50 short test (0.25 megohms) with high sensitivity leakage test The first (2.0 megohms) -will test series string tubes without adapter. low priced tube tester Model 3413 -B is a money -saver on original cost -a profit maker because it's to provide faster, more versatile, more flexible operation for more tests in less time. DUAL SENSITIVITY This tester does a better job today and tomorrow -and here's why: SHORT TEST New, longer roll chart includes all tubes up to the moment. 4. Triplett automatically furnishes revised, up -to -date roll charts regu- larly if you promptly return registration card. (Included with tester.) Flexibility of switching allows you to set up to test any new tube. 4. Tests TV picture tube by means of BV Adapter ($4.50) without remov- ing tube from set. Reads BAD -? -GOOD direct on big 6 -inch meter. Short tests (neon) each element with single flip of switch. And for the ultimate in laboratory quality testing examine MODEL 3423 MUTUAL CONDUCTANCE TUBE TESTER $199.50 Proportional Mutual Conductance testing of all radio and TV tubes plus selenium recti- fiers, crystal diodes, pilot lamps, thyratrons, transistors, etc., by a new patented circuit. At leading Parts Distributors everywhere, see the finest and most complete line of test equipment by ELECTRICAL INSTRUMENT COMPANY BLUFFTON, OHIO www.americanradiohistory.com An Invitation... To men who want to "go places" in TV SERVICING Fined out about this NEW, ALL -PRACTICE WAY of becoming a Professional TV SERVICEMAN If you have some Radio or Television experience, or if you know basic Radio - Television principles but lack experience- NRI's new Professional Television Serv- icing course can train you to go places in TV servicing. This advertisement is your personal invitation to get a free copy of our booklet describing this training in detail. Learn -by -Doing "All the Way" This is 100' , learn -by- doing, practical training. We supply all components, all tubes, including a 17 -inch picture tube, and comprehensive manuals covering a thor- ough program of practice. You learn how experts diagnose TV defects quickly. You see how various defects affect receiver per- formance- picture and sound; learn causes of defects, accurately, easily, ánd how to fix them. You do more than just build circuits. You get practice recognizing, isolating, and fixing innumerable troubles. You get actual experience aligning TV receivers, diagnosing the causes of com- plaints from scope patterns, eliminating interference, using germanium crystals to rectify the TV picture signal, obtaining maximum brightness and definition by Train at home easily, quickly, for TV's top servicing jobs. NRI's properly adjusting the ion trap and center- includes a 17 -inch picture ing magnets, etc. There isn't room on this Professional Television Servicing course or even several pages of this magazine to tube and all other tubes and components to build a complete TV list all the servicing experience you get. Receiver, Oscilloscope, Signal Generator, H.F. Probe. Complete UHF & COLOR TV Making New Boom Installing front -end channel selector strips training, including all equipment, available now for a low intro- in modern UHF -VHF Television receivers terms. and learning UHF servicing problems and ductory price -under $200 on easy their solution is part of the practice you get. To cash in on the coming color TV boom r- you'll need the kind of foundation in knowl- National Radio Institute, Dept. 6BFT edge and experience this training gives. 16th and U Sts., N.W., Washington 9, D. C. Get Details of New Course Free Please send my FREE copy of "How to Reach the Top Once again -if you want to go places in TV no salesman will call. servicing, we invite you to find out what in TV Servicing." I understand you get, what you practice, what you learn from NRI's new course in Professional Television Servicing. See pictures of equip- Name Age ment supplied, read what you practice. Judge for yourself whether this training will further your ambition to reach the top Address in TV servicing. We believe it will. We TV serv- believe many of tomorrow's top (I)\ Zone ....State icemen will be graduates of this training. HOME STUDY COUNCIL Mailing the coupon involves no obligation. APPROVED MEMBER NATIONAL J FEBRUARY, 1956 3 www.americanradiohistory.com RADIO E LIM MIMICS Formerly RADIO CRAFT Incorporating SHORT WAVE CRAFT TELEVISION NEWS RADIO & TELEVISION* Hugo Gernsback FEBRUARY 1956 Vol. XXVII, No. 2 Editor and Publisher M. Harvey Gernsback Editorial Director Fred Shunaman Editorial (Page 33) Managing Editor Robert F. Scott Space Electronics by Hugo Gernsback 33 W2PWG, Technical Editor Jerome Kass Associate Editor Electronics (Pages 34-41) I. Queen Editorial Associate Portable Scintillation Counter, Pari- I- Complete construction details Matthew Mandl for highly sensitive radioactivity indicator by James W. Bray 34 Television Consultant Simple Cyclic Electrotimer by Henry Francis Parks 38 Elizabeth Stalcup Production Manager Characteristics of General- Purpose Transistors by Rufus P. Turner 40 Angie Pascale Editorial Production Wm. Lyon McLaughlin What's New? 42 Tech. Illustration Director Sol Ehrlich Art Director Test Instruments (Pages 44 -51) Transistorized Scope Calibrator by Edwin Bohr 44 Transistor Multivibrator and Balance Generator by Joseph Braunheck 46 A Standard Potentiometer for Precise Lee Robinson General Manager Measurements by Forrest H. Frantz, Sr. 48 John J. Lamson Radio I.F. Tester by Nathaniel Rhita 51 Sales Manager G. Aliquo Circulation Manager Audio -High Fidelity (Pages 52 -61) Adam J. Smith Director, Newsstand Sales Build This Simple Echo Unit by Daniel M. Costigan 52 Robert Fallath Promotion Manager Developments in Audio Circuits by Robert F. Scott 54 For Golden Ears Only: Ampex Stereo System; Pro -Plane Prismatic I Speaker System by Monitor 57 Building a Boffle by H. A. Hartley 59 GERNSBACK PUBLICATIONS, INC. Radio (Pages 62 -82) Executive, Editorial and Adver- Railroad Radio's First Decade by Leo G. Sands 62 tising Offices, 25 West Broad- way, New York 7, N. Y. Tele- Not All Inductors Are Coiled by H. P. Manly 77 phone REctor 2 -8630. Hugo Gernsback Television (Pages 88 Chairman of the Board -100) M. Harvey Gernsback 630 Remote Control by Raymond L. Clift 88 President G. Aliquo Secretary TV Service Clinic Conducted by Jerry Kass 92 Colordapter, Pert II -Color wheel co nstruction and drive mechanism; alignment and adjustment of the complete system by Perry H. Vartanian and Robert W. De Grasse 97 ON THE COVER DEPARTM ENTS (Additional photos on page 43) Books 143 People 138 The Darb Holiday radio, as Business 134 used by a typical Southern Question Box 125 university coed. Corrections 104 Radio Month 6 Color original by Ken Schmid Correspondence 14 Radio -Electronic Circuits 120 New Devices 108 Technical Literature 141 New Records 102 Technicians' News 106 New Tubes and Transistors 112 Technotes 113 I a o e Patents 128 This 131 Try One 10; Average Paid Circulation over 175,000 Associate Member of Institute of High Fidelity Mfrs., Inc. Á RADIO -ELECTRONICS, February. 1956. Vol. XXVII, No. 2. Published monthly at Mt. Morris, I15., by Gernsback Publications, Inc. Second -class nail privileges authorized at Mt. Mo iris. M. Copyright 1956 by Gernsback Publications, Inc. All rights reserved under Universal, International and Pan -American Copyright Conventions. SUBSCRIPTIONS: Address correspondence to Radio -Electronics, Subscription Dept., 404 N. Wesley Ave.. Mt. Morris, Ill., or 25 West Broadway, New York 7, N. Y. When urdt -ring a change please furnish an address stencil impression from a recent wrapper. Allow one month for change of address. SUBSCRIPTION RATES: U. S., U. S. possessions and Canada, $3.50 for one year; $6.00 for two years; $8.00 for three years; single copies 35c. Pan -American countries $4.00 for one Year:.i. Sn nn two years: $9.50 for three years. All other countries $4.50 a year; $8.00 for two years; $11.00 for three years. BRANCH ADVERTISING OFFICES: Chicago: 1413 Howard St. Tel. Rogers Park 4 -8000. Los Angeles: Ralph W. Harker and Associates, 600 South New Hampshire. Tel. DL'nkirl; ï - :LYS. San Francisco: Ralph W. Harker and Associates, 582 Market St., Tel., GArfield 1 -2451. FOREIGN AGENTS: Great Britain: Atlas Publishing and Distrib- uting 1'n., l.td.. London l:.C. 4. Australia: McGill's Agency, Melbourne. France:: Brentano's, Paris 2e. Belgium: Agence et Messageries de la Presse, Brussels. Holland: Trilectron, lieemsted,-. Greece: International Book & News Agency, Athens. So. Africa: Central News Agency Ltd.. Johannesburg; Capetown, Durban. Natal. Universal Book Agency, Johan- nesburg. Middle East: Steinratz Middle East Agency. Jerusalem. India: Broadway News Centre. Dadar. Bombay #14.
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