Radio today (Apr-Dec 1939)

THOUSANDS of ONAN ELECTRIC PLANTS are supplying ALTERNATING CURRENT all over the World, for Lighting, Operating All Appliances and Powering RADIO TRANSMITTERS and RECEIVERS for Amateur and Commercial Operators. PORTABLE ONAN PLANTS are Operating Public Address Systems, Sound Truck Apparatus, Moving Picture Projectors, etc. Others are installed in Public and Private Buildings, to provide Electric Service in case of Power Line Failure. Many of these have prevented financial losses and even loss of life in such Emergencies. ONAN ELECTRIC PLANTS are Dependable, Economical and Long-lived. Types from 350 to 5,000 Watts carried in stock. Models include 110 or 220 Volt, AC— 12, 32 and 110 Volt DC— also Dual Voltage AC-DC Units. Furnished in either Manual, Full Automatic or Self-Starting Types. Shipped READY TO RUN. Prices start at $99. WRITE FOR DETAILS AND PRICES D. W. ONAN & SONS 508 Royalston Ave. Minneapolis. Minn. Hew doom* ADD LAFAYETTE P.A. TO YOUR LIST OF MONEY MAKERS! BIG PROFITS! in Public Address these daysl Just look around you. In cafeterias, ball parks, offices, plants, churches, theatres— wherever folks gather in numbers — you can sell a sound system. EASIEST TO SELL is a Lafayette system. Long-famed for performance-with-thrift, Lafayette this year offers three complete lines — the Economy, Standard and DeLuxe. Completely redesigned and streamlined for added buying appeal. Lafayette's the most complete line of sound equipment in the world todayl, ■■''. GET THE FACTS! Find out/^^fes how you IAFAYETTE p, a, saCet> divhion v Clarostat Service Manual listing volume control replacements and circuitsClarostat Mfg. Co., 285 N. 6th St., Brooklyn, N. Y. Illustrated booklet and catalog showing new markets for cooling and ventilating equipment sales. Kisco Co., Inc., 4414-18 W. Papin St., St. Louis, Mo. Description and specs of Weston Photo-electric cells model No. 594, types 1 and 2. Weston Elec. Inst. Corp., 614 Frelinghuysen Ave., Newark, N. J. Supplement to Stromberg-Carlson Catalog No. 38-R covering all parts used on 235, 245, and 300 series receivers. Latest prices. StrombergCarlson Tel. Mfg. Co., 100 Carlson Rd., Rochester, N. Y. Victor Record Catalog supplement with complete list of records released since issue of 1939 catalog. RCA Mfg. Co., Front & Cooper Sts., Camden, N. J. Description and technical data on American D6T dynamic microphone. Bulletin No. 29-A. American Microphone Co., Inc., 1915 S. Western Ave., Los Angeles, Cal. "The Public Address 'Blue Book,' " showing Bogen line of sound systems and equipment. Catalog P3-39A. David Bogen Co., Inc., 663 Broadway, New York, N. Y. "The ABC of Radio," published for public distribution as part of NABRMA campaign to "sell American radio." Beautifully laid out, it contains convincing copy designed to benefit the entire trade. National Assoc, of Broadcasters, National Press Bldg., Washington, D. C. Bulletin No. 70 on PM speaker and No. U-300 with revised prices and data on electro-dynamic unit. Fox Sound Equip. Corp., 3120 Monroe St., Toledo Ohio. Replacement parts catalog with 32 pages of illustrations and descriptions of speakers, vibrators, transformers and Utah-Carter parts. Utah Radio Prod. Co., 816 Orleans St., Chicago. Allied Spring-Summer 160 page catalog called "Everything in Radio." Allied Radio Corp., 833 Jackson Blvd., Chicago. University loudspeaker line described and illustrated in new catalog No. S39. University Labs., 195 Chrystie St., New York, N. Y. 19 page bulletin on RCA Radiotron tube advertisements. Chronological table of radio high-lights. RCA Mfg. Co., Front & Cooper Sts., Camden, N. J. 20 page catalog with technical details is second edition of 1939 Hammarlund parts catalog. Hammarlund Mfg. Co., Inc., 424 W. 33rd St., New York, N. Y. 12 page booklet on Aladdin Q Control Permeability Tuner. Aladdin Radio Industries, Inc., 466 W. Superior St., Chicago. 22 page catalog on DX coils, chokes, transformers, inductances, trimmer condensers. DX Radio Prod. Co., 15711579 Milwaukee Ave., Chicago. Technical Bull. No. 400 on dynamic visual analysis of the power supply. Bull. No. 150 — Practical Application of the Oscillograph to Modern Radio Servicing. Price 25 cents. Hickok Elec. Instrument Co., 10514 Dupont Ave., Cleveland, Ohio. 1939 Halldorson transformer catalog and replacement guide includes 3-in-l mountings and television transformers. Halldorson Co., 4500 Ravenswood Ave., Chicago. Spring sound catalog with complete array of sound systems and accessories. Clarion Institute of Sound Engineers, 69 Wooster St., New York, N. Y. Catalog No. 76 with over 180 pages on products of Lafayette Radio Corp., and Wholesale Radio Service Co., Inc., 100 6th Ave., New York, N. Y. History of television and description of RCA electronic system called "RCA Television." Also "Television in Advertising" giving uses of television as advertising medium. National Broadcasting Co., 30 Rockefeller Plaza, New York, N. Y. Supplement to Thordarson Replacement Transformer Encyclopedia is No. 243-D. Complete info on correct transformer and choke replacements for 1938-9 receivers as listed in Rider Manual IX. Thordarson Elec. Mfg. Co., 500 W. Huron, Chicago. Catalogs, with prices on Bendix automotive, electrical and radio test equipment now available. Bendix Radio Corp., Detroit, Mich. Condensed catalog No. 10 with complete info on all Hickok radio test equipment. Hickok Elec. Inst. Co., 10514 Dupont Ave., Cleveland, Ohio. Bulletins 250-1-2-3-5 on REL sound and radio communication equipment and installations. Radio Engineering Labs., Inc., 100 William Ave., Long Island City, N. Y. Review of ATA test apparatus illustrated and with complete data. Approved Technical Apparatus Co., 57% Dey St., New York, N. Y. Description of JFD noiseless antenna and other auto-radio accessories. JFD Mfg. Co., 4111 Ft. Hamilton Pky., Brooklyn, N. Y. Folder on Little Giant magnets for loudspeakers and electric instruments. Gives demagnetization and energy curves for various magnet materials. Crucible Steel Co. of America, 405 Lexington Ave., New York, N. Y. 76 RADIO TODAY