Radio today (Sept 1935-Dec 1936)

AMPERITE ptventi. Distinguished In Quality, Design, and Construction SERVICE NOTES Hnokoil featuring. Embodies the latest technique in midophone design Compact. Streamline. Modern. All cast case achieves maximum ruggedness. Fitted with Switch, and new Cable Clamp. Models RBHn (High Impedance); RBMn (200 ohms). EHS3EJ With built-in Cable Connector having locking device $44.00 List. • NEW! Models RBSn, RSHn —EXCELLENT ALL AROUND MICROPHONES FOR SPEECH and MUSIC. Slightly lower output and frequency range than above. APPEARANCE SAME AS ABOVE: mmm 1. Output increased 6 DB. 2. Triple shielded — against all RF or magnetic iields, entirely elir " hum pickup. 3. ET-: Now! An Amperite Velocity within the means ol everybody! A specially designed microphone buill lo Ampenie standards, which can be used lor both speech and music. No peaks. Flat response. Triple shielded. Shock absorber, Swivel bracket. Models RAL (200 ohms); RAH (2000 ohms) k-vmoaffll TREE! TO DEALERS AND SERVICE MEN: A Striking Window DecaL advertising your SOUND SERVICE and displaying the New AMPERTTE VELOCITY. Write tor it nowl MAIL THIS COUPON NOW Please send me your SOUND SERVICE window decal FREE. City Jobber □ Dealer □ Serviceman Q (From page 48) A dual-window meter is featured in the new Supreme line — meter is illuminated and scales more easily read. tomer's set — what could be fairer? Of course, a tube tester is an excellent device and is to be recommended — for the customer can be shown just how his tubes are in terms of English. ADVANTAGES, LIMITATIONS OF FIVE TYPES OF MIKES * The rapid advances in sound equipment have brought out the development of five distinct types of microphones and the sound man should know the uses and limitations of each type. Mr. John Erwood, Vice-President of Webster-Chicago recently gave his opinion of the advantages and limitations of each type as follows. Carbon microphone The carbon microphone consists of a stretched diaphragm across the center of which rests a loosely packed pile of carbon granules in a carbon cup. Sound pressure waves, on striking the diaphragm, cause a lateral movement with a consequent increase or decrease of pressure upon the carbon granules. An electric current is maintained through these granules and the effect of changing pressure of the granules is to vary the resistance of the element which causes a fluctuating current across two terminals mounted on either side of the carbon pack. Advantages: It is low in cost, has a relatively high output and is of low impedence. Limitations : It is limited in fre(To page 52) Use the word "NOKOIL" when ordering Permanent Magnet Moaei 682 J|JJ2 Speakers List Price The NOKOIL Reproducers were the first small Permanent Magnet Speakers. From the smallest speaker for the radio set to the large 72" Public Address Unit. The NOKOIL Reproducers comprise the most complete line of Permanent Magnet Speakers being offered to the trade today. Protect yourself by insisting that the name "NOKOIL" appear on all Permanent Magnet Speakers you purchase. Write for Circular and prices. Wright-DeCoster distributors are always anxious to cooperate. WRIGHTDeCOSTER, Inc. 2265 University Ave, St. Paul, Minnesota Export Dept. — M. Simons & Son Co., New York Cable Address: "Simontrice" Canadian Office, Associated Sales Co., Guelph, Ont. %!fifcl ALU EDS 1937 RADIO CATALOG Ha*1? i® SEND COUPON Every Service Department needs this up-to-the-minute Catalog! 152 pages packed with everything in radio, including the very latest developments. Over 10,000 exact duplicate and replacement parts — newest service test equipment, tube testers, oscillographs, analyzers, meters — tadio books, tools — 38 new low-priced radio receivers — All-Wave, DualWave and ShortWave, from 5 to 19 tubes— AC. battery, 32-voH, 6-volt and auto sets; latest Public Address systems — America's most reliable Windcharger and Rurl power units — tubes, batteries, accessories, etc. Vou can fill every service need from the ALLIED Catalog, at lowest prices. Just send coupon. ALLIED RADIO I 833 W. JACKSON BLVD. Dept. 15-K ■ Chicago, III. ■ Send us your new 1937 Catalog (Free). _ Name _ Address City State I J 50 Radio Today