Radio Broadcast (May 1928-Apr 1929)

RADIO BROADCAST ADVERTISER 141 Letters from Readers (Continued from page 1 39) 5-tube, push-pull outfit, using two straight 6:1 stages of audio, followed by push-pull. Incidentally, as a matter of information, for use in the tropics the Samson transformer is the only 100 percenter we have found in the commercial type to withstand humidity, etc. This is a tip for any jungle parties or other expeditions expecting to use States' constructed receivers in this territory. Of the commercial sets Atwater Kent's special Tropical Model receiver is the only one to meet with existing conditions in the tropics. L. C. Leighton, Cristobal, Canal Zone. Advertising Circulars f~\\JR contributor Robert S. Kruse has been ^-^ an amateur for a number of years and, as a result, his name and address have been listed in many radio call books. Persons whose hobby is made public in this manner always receive a great deal of advertising in their mail, and this is often considered an annoyance, particularly when two or three circulars on the same subject are received. Judging from his letter, Mr. Kruse is evidently the victim of considerable highpowered publicity of this sort. To the Editor: It is possible to do the industry a service by stating publicly that the mailing list of radio amateurs employed by several prominent New York mailing firms is of the same vintage as the water that floated the ark. Advertisers are paying good money to have circular matter sent to stations that were dead three years ago. I, for instance, am constantly receiving such matter addressed to a station at Silver Lane, Conn., which has not existed for four years, and one at Washington, D. C, which has been dead for eight years, and even one at Lawrence, Kansas, which took out its last license in 1914! Robert S. Kruse, West Hartford, Conn. Short Wave Stations \4ANY radio listeners equipped with shortJ 1 wave receivers are anxious to pick up the signals of experimental telephone stations operating on frequencies within the range of their set. In this connection Radio Broadcast has endeavored to prepare a schedule of short-wave transmissions, but it has been found that the hours of operation of these stations is varied from day to day. The list which is printed below contains as much accurate data as it is possible to publish at the present time. The principal stations of the world, which may be heard regularly in this country with a simple shortwave receiver, are listed in the order of their assigned wavelengths. Call Letters Location Wave Length AGC Nauen, Germany 17.2 PCLL Kootwijk, Holland 18.0 WO WO Fort Wayne 22.8 5SW Chelmsford, England 24.0 2XAB New York 24.0 2FC Sydney, Australia 28.5 2ME Sydney, Australia 28.5 PCJJ Hilversum, Holland 30.2 2XAL New York 30.91 2XAF Schenectady 32.7 JB Johannesburg, S. Africa 32.0 PCLL Kootwijk, Holland '. . .32.0 6AXR San Francisco 33.0 3LO Melbourne, Australia 32.0 2XAI Newark 43.0 WBZ Springfield 50.0 WTFF Mt. Vernon, Va 56.0 AJG Nauen, Germany. . 56.7 WLW Cincinnati 52.02 2XE Richmond Hill 21.1 GC Paris, France 60.0 3XL Bound Brook 60.0 9XU Council Bluffs 61.06 KDKA Pittsburgh 62.5 2XBA Newark 65.18 WBZ Springfield 70.0 HAVE YOU HEARD IT? New 1929 EIGHT-IN-LINE Eight tubes in line — aluminum construction throughout — all power equipment an integral part of chasis — this year's masterpiece of mechanical construction. Browning-Drake dealers know the value of tonal perfection, and what it means to their customers. Listen to a 1929 type receiver and understand why there are a million Browning-Drake fans. BROWNINGDRAKE CORPORATION Cambridge, Mass. BROWNING-DRAKE RADIO BOOKS in a minute by TELEGRAPH DOUBLEDAY, DORAN BOOK SHOPS New York Newark Toledo Kansas City Cleveland St. Louis More "A" Power For Less Money! With the Set Builders discount card you can purchase a Knapp "A" Power Kit at a liberal discount. Write me today f orfull detailstelling about this new money-saving plan for set builders. DAVID W. KNAPP, Pres. Knapp Electric, Inc. Room 414 Division of P. R. Mallory Si Co., Inc. 350 Madison Ave. New York ) AT LAST! Matched Tubes the Only Assurance of Maximum Efficiency and 100% Satisfaction from any Tuned Radio Frequency or Super Heterodyne Circuit. This is the first time matched sets of Cunningham or R. C. A. tubes have been offered at list price. Tested and matched seven ways on our specially designed testing panels. All tubes plainly marked with characteristics. Order today. Pay the postman the list price plus 5c each for packing and shipping. LIST PRICE 112A $2.75 210 $9.00 120 2.50 222 6.50 171A 2.75 226 2.25 199 2.25 227 4.00 200A 4.00 240 2.00 201A 1.50 H. M. HEWSON, Merion, Pa.