Radio today (Jan-Mar 1939)

WIRE— Cont'd ESSEX WIRE CORP., 14310 Woodward A?e., Detroit, Mich., "S-X"— A, CC, CO, HU, IC, L, M, MC, H, RC, S, SI GENERAL CABLE CORP., 420 Lexington Ave., New York, N. Y.— A, HU, M, MC, H GENERAL CEMENT MFG. CO., 611 Lincoln Ave.. Rockforrt, 111., "G-C" — CO, FL, R GENERAL INSULATED WIRE CORP., 53 Park PL, New York, N. Y.— CC, CO, HU, Id MC, S E. I. GUTHMAN & CO., INC., 400 S. Peoria St., Chicago, 111.— L, M HOKE VERTICAL RADIATORS, 135 S. Market St., Petersburg, Va. — A, AT, AN, ANT, CC, G, IC HOLYOKE CO., INC., 720 Main St., Holyoke. Mass. — IC HUDSON WIRE CO., Winsted Division, 981 Main St., Winsted, Conn. — L, M ISOLANTITE, INC., 233 Broadway, New York. N. Y. — CC. INSULINE CORP. OF AMERICA, 25 Park Place, New York, N. Y.— HU, IC, B, RC, S, SI ■%>' **,V THE THEORY a w OF RADIO SERVICE WORK Priceless Knowledge at your Command f&te^-Ute BRAINS ALL IN 1 BOOK Everything you need to know about the theory of radio service work is explained to you in this big Ghirardi book. It teaches you exactly HOW to do every step of it— and WHY. Learn up-todate factory servicing methods from the experience of leading service organizations — condensed and simplified for you in this convenient source-book. BASIC FUNDAMENTALS Here in compact form is your complete background in test instruments— how they work — how to use them; trouble-shooting; repair method*; and everything else essential for a thorough knowledge of modern radio servicing. Ghirardi makes it ail wonderfully clear and easy to understand. With this solid foundation you will be prepared to tackle and solve the most difficult servicing problems you'll ever meet. Make yourself a better, more successful service man. Get your copy at once — with an absolute MONEY-BACK GUARANTEE. Mail coupon today I Ghirardi s # Test Equipment A 420-page flection. giving you the whole theory and construction of every type of test and servicing equipment. Diagrams . construction data. etc.. •> Repairing 0 Trouble 254 pages e eliminaetc. ■Shooting of latest in tracking ndsofdiffi oublei (Special Problems Wave set deMty seti QAVCcire and Advei i; High-FiJ AVC and uiis: Selling tisins; etc.. MODERN RADIO SERVICING I13O0 DP.* Radio & Technical Publ. Co l__ _ ... I « Astor PL. Now York. Da 1706 illus.i a MAIL NOW! . Dap*. RYB ;re is *4 ($4.50 foreign) for my copy ofMODERN RADIO SERVICING. I Here is $6.50 ($7 foreign), the "Special Combination Price" for the above book, together with Ghirardi'r TROUBLE-SHOOTER'S HANDBOOK (see opposite ad). NAME ADDRESS CITV 'STATE .> O Please lend free literature > M describing detailed contents of tX MODERN RADIO SERVICING. ^w SAVE MONEY! by ordering MODERN RADIO 'SERVICING and RADIO TROUBLE-SHOOTER'S HANDBOOK both together at Special Combination Price — $6.50, shipped postpaid in U.S. KELLOGG SWITCHBOARD & SUPPLY CO., 6650 So. Cicero Ave., Chicago, 111., "Kellogg" — CO, HU, IC LENZ ELECTRIC MFG. CO., 1751 N. Western Atc, Chicago, 111.— A, HU, M, IC, S LOWELL INSULATED WIRE CO., 171 Lincoln St.. Lowell, Mass.— A, AT. CO, HU, IC P. R. MALL0RY & CO., INC., 3029 E. Washington St., Indianapolis, Ind., "Yaxley" — IC, MC, H MEISSNER MFG. CO., Mt. Carmel, HI.— L MUTER CO., 1255 S. Michigan Ave., Chicago, 111., "Spirashield" — WS OH MITE MFG. CO., 4835 W. Flournoy St., Chicago, 111., "Cordohm"— RC PHELPS DODGE COPPER PRODUCTS CORP., 40 Wall St., New York, N. Y.— A, AT, AN, ANT, CC, CO, HU, IC, M PHILMORE MFG. CO., 113 University PI.. New York. N. Y., "Philmore"— RC RADIO RECEPTOR CO., INC., 251 W. 19th St., New York, N. Y.— ANT, CC REA MAGNET WIRE CO., INC., E. Pontiac St., Fort Wayne, Ind., "Rea" — M JOHN A. R0EBLING SONS CO., Trenton, N. J. RUPP'S ASSEMBLING & MFG. WORKS, 2341 N. Seminary, Chicago, HI. — CO, IC, MC, H SIMPLEX WIRE & CABLE CO., Cambridge, Mass. SPIRASHIELD— Muter Co. STATES CO., 19 New Park Ave., Hartford, Conn.— R SWEDISH IRON & STEEL CO., 17 Battery PL, New York. N. Y.— M S-X — Essex Wire Corp. TRANSDUCER CORP., 30 Rockefeller Plaza, New York, N. Y., "Transducer" — CC TRIANGLE CONDUIT & CABLE CO., INC., Horace Harding & Queens Blvds., Elmhurst, N. Y. — A, AT, AN, ANT, CC, IC WESTERN ELECTRIC CO., 195 Broadway. New York, N. Y.— CC, CO, S YAXLEY— P. R. Mallory k Co., Inc. SERVICE MANUALS & BOOKS Acoustics A Advanced theory AT Beginners' theory BT Electronics E Interference elimination . . IE Service manuals S Sound systems . . . . SS Television TEL Tubes . . . T AKRAD PRODUCTS CO., 362 Wooster Ave., Akron. Ohio— BT, S AMERICAN RADIO RELAY LEAGUE, W. Hartford, Conn.— AT, BT, IE, T P. BLAKISTON'S SON & CO., INC., 1012 Walnut St., Philadelphia. Pa. CALDWELL-CLEMENTS, INC., 480 Lexington Ave., New York, N. Y., "Radio Today," "Radio Year Book" CAMERON PUBLISHING CO., P. 0. Box 1386, Little River, Miami, Fla.— A, AT, BT, S, SS FREDERICK J. DRAKE & CO., 179 No. Michigan Ave., Chicago, 111. — E, S McG RAWHILL BOOK CO., 330 W. 42nd St., New York, N. Y— AT, BT, E MACMILLAN CO., 60 Fifth Av'e.. New York, N.Y.— A PACIFIC RADIO PUBLISHING CO., Pacific Bldg., Box 3278, San Francisco, Calif. — TEL RADCRAFT PUBLICATIONS, INC., 99 Hudson St., New York, N. Y.— AT, BT, S RADIO & TECHNICAL PUBLISHING CO., 45 Astor PL, New York, N. Y.— A, AT, BT, IE, S, SS, T RADIO, LTD, 7460 Beverly Blvd., Los Angeles, Calif. —AT, BT. IE, T RADIO TODAY— Caldwell-Clements, Inc. RADIO YEAR BOOK— Caldwell-Clements, Inc. JOHN F. RIDER, Publisher, 404 4tb Ave., New York, N. Y.— S SHERWOOD PRESS, Box 552, Edgewater Branch, Cleveland, Ohio — IE, S SUPREME PUBLICATIONS, 3727 West 13th St., Chicago. I1L— BT UNITED CATALOG PUBLISHERS, INC., 260 Broadway, New York, N. Y. D. VAN N0STRAND CO., INC., 250 Fourth Ave., New York, N. Y. JOHN WILEY & SONS, INC.. 440 Fourth Ave., New York. N. Y. NEW PATENTS ISSUED Central Communication Devices, Inc., 140 W. 22nd St., N. Y. C, has acquired sole manufacturing rights to a patent allowing 15 claims. The principal feature of the invention is instantaneous two-way communication — it converts from a call receiver to twoway communication automatically without a talk-and-listen switch. The device is highly portable, using electric power lines for transmission. Tests in mines and steel plants have been successful at distances from 2 to 6 miles. W. G. H. Finch, pres. of Finch Telecommunications Laboratories, Inc., N. Y. C, has been awarded a patent on a new high-speed multiplex tele THE PRACTICE OF RADIO SERVICE WORK Brand NEW^ and it's a knockout: ffetw-foii ata READY FOR ACTION New as tomorrow'a radio seta io this latest Ghirardi serviceman's Handbook — a Handbook that IS a Handbook! Data*— •ay. it'a packed jam full of just the kind of practical, tlmatavlnfl lorvldnf dope you really want in your ahop — loads of indispensable, factory -checked servicing data boiled down to the real essentials — tabulated and organised for split-second reference. And right up to the minute.— even for the 1939 modelal 1 at Aid for Set Trouble* Here, right at your finger tipsare the answers to all the "tough vcb< of onds to of fiddling and fussing on nara service jobs. You've just got to see this new book! And you won't have to take a single chance, because with our MONEY-BACK GUARANTEE you can return it within 10 days and get your money refunded. Don't fall behind. Don't let it slide. ORDER YOUR COPY TODAYI • Cm* Historic* Trouble Symptoms and remedies for over 2.000 •eta, compiled from actual service records. • l.-F. Peaks Over 12,000 listings for alignment of all superbets old and new. including 1939 models and "orphans. " • Auto-Radio Interference Elimination for over 80 car models; Installation and Car Ignition System Data Chart; Electrical Wiring Diagrams; Gear Ratios and Dial Directions of Tuning Control*. • Other Data Trouble Shooting Charts: Servicing Recat .ng Systems. P-ASyatemt; Trade Directonea; and over 30 other charts and tables on Tubes. Wire. Grid-Bias Resistors. RMA Color Codes. etc. Standard Manual IT'SMEIV/ gttvlhi HANDBOOK OVER SOO pages MAIL NOW! ■ Radio tV Tecnnlcal Publ. Co.. | 4S Astor PL.Naw York. Dopt. RYB J n Here is *3 (J3.50 forcim) for n.y copy ■ ofRADIOTROUBLE-SHOOTER'S ■ _ HANDBOOK. ■ 0 Here is $8.50 ($7 foreign), the "Special ■ Combination Price' for the sbore book, together with MODERN RADIO SERVICING (seo opposit, ad). NAME A DDRES3 CITY STATE IPleaae send free literature describing detailed contents of RADIO TROUBLE-SHOOTER'S HANDBOOK. $3l "BLE-SHOOTER'S HANDBOOK and MODERN RADIO SERVICING both together at Special Combination Price — $6.50, snipped postpaid in U.S. 80 RADIO YEAR BOOK