Radio today (Sept 1935-Dec 1936)

COMPLETE ELECTRIC PLANTS OJAX ALTERNATING CURRENT PLANTS OPERATE A.C. RADIO. PUR LIC ADDRESS SYSTEMS, SOUND CAR EQUIPMENT, MOTION PICTURES. Can Re Used Anywhere Supply Electricity for Camps, Cottages, Farms, Boats, Commercial Purposes and places where current is not available from power companies. Will Operate Water System. Refrigerator, Household Appliances. Sizes to Suit Every Purpose Built in sizes 350 to 50,000 watts, $110 and up. Supply 110 or 220 volt, 60 cycle, single or three phase current. Operate on Gasoline, Gas or Distillate. Also 32 volt, D.C. Models. All Models furnished complete, ready to run. Write for Details D. W. ONAN & SONS 566 Royalston Ave. Minneapolis, Minn. ..PLUS THIS MOST COMPLETE RAD0LEK RADIO BUYING GUIDE THE Radolek New 1937 Radio Profit Guide is the most complete Radio Parts Catalog ever published. Completely revised — right up to the minute, bringing you everything in Radio — and Public Address — at the right prices. Contains over 10,000 Individual Radio Repair Parts — hundreds of new items — a complete new selection of Radio Receivers, P. A. Amplifiers, Tools, Tubes, Books and Instruments. Everything you need — always in stock . . . ready for prompt shipment to you. You need this Big Radio Parts Catalog — it's FREE. Send for it! NOW! RAD0LEK7 637 w"Ran7olph~ChTcago" " Name Address Serviceman? □ Dealer? G Experimenter? G SERVICE NOTES {From page 44) word to the wise should be sufficient. Oh, yes, as for trying to find that break in the lead-in wire where it goes over the coal bin — better wear overalls. UP-TO-DATE TEST EQUIPMENT A self-calibrating vacuum tube voltmeter is Triplett's answer to voltage measurements in high-resistance and radio frequency circuits. * Newest editions of service equipment boast of many new advances and the design is such that obsolescence is quite remote. Shown at the New York I.E.S.M. Convention were many outstanding models — tube checkers, analyzers, oscillators, multi-meters, oscillographs, vacuum tube voltmeters, and many other devices. With the increasing circuit complexity, the need for modern flexible test equipment is paramount. Good test instruments enable the serviceman to do more and better work in less time. A complete analyzer or multi-meter that will accurately measure AC and DC voltages, DC current, resistance and capacity through all the ranges found in modern sets is indispensible. An all-wave oscillator and output {To next page) The Simpson Roto-Ranger instruments have a meter scale that is automatically changed by the range selector switch — on the 300-volt range only the 300-volt scale is visible. DYNAMIC MICROPHONES ARE INCREASING IN POPULARITY because they — have greater sensitivity — -are free from inductive pickup — have no background noise — can work with long lines — are sturdiest ever produced — are weatherproof — are small in size — are reasonable in price • Radio Receptor AMPLIFIERS . . . are designed for flexible application to any sound amplification problem. PRE-AMPLIFIER Model LAL2 Radio Receptor PRE-AMPLIFIERS . . . These pre -amplifiers are thoroughly shielded — Radio Receptor transformers, metal tubes, designed for gains of 27 to 90 db. POWER AMPLIFIER Model LPC3 Radio Receptor POWER AMPLIFIERS . . . These amplifiers have 2 and 3 stages. Gain from 52 db. to 102 db. — output 15 to 60 watts. We solicit requests for special sound and amplifying equipment. Send for our latest Bulletin 3013 on microphones. Bulletins D-001 to D-005 describe Amplifiers. We are pleased to send these to you. RADIO RECEPTOR CO., Inc. 110 SEVENTH AVE., NEW YORK, N. Y. October, 1936 47