Radio Broadcast (May 1928-Apr 1929)

f ii'St time 14i RADIO BROADCAST ADVERTISER POWER TRANSFORMERS For the UX250 Power Tube Type 565-B Transformer (200 Watts) Pric e $13.50 Bulletin No. 931 will be sent on request The success of a high-qualityamplifier depends largely on the power supply. The General Radio Type 565 Power Transformers are especially designed for use in plate-supply units intended for the 250 type of power tube. The type 565-B Transformer illustrated consists of a center-tapped 1,200 volt secondary and two 7.5 volt secondaries. It is designed for 105 to 125-volt, 50 to 60-cycle lines. General Radio Company 30 State St. Cambridge, Mass. 274 Brannan St., San Francisco, Cal. SET BUILDERS write for Discount Card Enabling you to purchase the new and Improved Knapp"A" Power Kit at big discount — Write for full particulars. DAVID W. KNAPP, Pres. Knapp Electric, Inc. Division of P. R. Mullory & Co. Inc. Room 414, 350 Madison Ave., N. Y. C. 4 CUSTOM SET BUILDERS Browning-Drake has an interesting and unusual proposition. Take advantage of the fact that more Browning-Drakes are built than any other. Write today. BROWNING-DRAKE CORP. Cambridge Massachusetts Why not subscribe to Radio Broadcast? By the year only $4.00; or two years $6.00, saving $2.00. Send direct to Doubleday, Doran & Co., Inc., Garden City, New York. Send for WESTERN RADIO m DEALERS AND SET BUILDERS The NEW 1929 catalog is crammed full of the FINEST, NEWEST, Nationally known A. C. sets, consoles, cabinets, dynamic speakers, kits, eliminators and accessories at LOWEST PRICES. Largest stock of radio parts Prompt delivery. No delay. Write for our FREE catalog WESTERN RADIO MANUFACTURING CO. V?ft W TalfP St rtfnt RR-12 Chica™ (^BigFriendlyRadioHous mi The Only Unit With a Wave Length Range of 15 to 550 Meters Introducing another triumph for SHORT WAVE reception. Highest efficiency at an amazingly low price, made possible by economic production. Now, all can afford to get the best entertainment of the air being broadcast on short waves by many powerful stations thruout the U. S. and Europe. EASY TO ATTACH AND OPERATE The new model, Dresner Shielded Short Wave Converter is completely assembled, and may be used on any set. It is built in a beautiful mahogany finished metal cabinet. Efficiently covers a wave band of 15 to 550 meters. GUARANTEED to give you highest satisfaction. Take advantage of this special offer at once. If your dealer cannot supply you, SEND MONEY ORDER DIRECT ana we will ship at once. (When ordering unit, be sure to specify whether it is to be used on AC or DC set). Dresner Radio Manufacturing Corp. 640 Southern Boulevard Dept. A1? New York, N. Y. RetnarkaMylowPiice Be An Expert RADIO OPERATOR! cTfd £yleir£ amazing instrument teaches you to read code in half the usual time. Reproduces aciital sending of expert operators. Sends you messages, radiograms, etc., anywhere, any time, any speed. You'll be ( amazed when you hear it. Just like having an expert operator in your home. Code lessons recorded on strong, waxed-tape records make everything simple and clear. Send only $3.50 for Midget Teleplex with lessons ; or $5. 50 complete with high-frequency key and buzzer. Satisfaction guaranteed. Money back if not delighted. Send today. TELEPLEX CO., 72 Cortlandt St., New York, N. Y. New York Atlantic City Chicago St. Louis Kansas City Cleveland Springfield Doubleday, Doran Book Shop