Radio broadcast .. (1922-30)

.RADIO BROADCAST ADVERTISER. One Mile from WSM— 400 from WMAQ—and the 712 Cuts 2O kc.! 722 Band Selector Seven Providing practically all 1930 features found in most new$2OO receivers, the S-M 722 is priced absurdly low in comparison. 3 screen-grid tubes (including de- tector), band filter, 245 push- pull stage—these help make the 722 the outstanding buy of the year at $74.75 net, completely wired, less tubes and cabinet. Component parts total $52.90. Tubes required: 3—'24, 1—'27i 2—'45, 1—'80. Beautiful Cabinets The handsome new 707 table model shielding cabinet, finished in rich crystalline brown and gold, suitable for 722, 735, or 735DC, is only $7-75. Special ar- rangements have been made whereby these receivers may be housed in magnificent consoles especially adapted to them. Be sure to send for the new Fall S-M General Parts Catalog, for details of these cabinets. W. W. DILLON & CO. Realtors, Nashville, Tennessee "Silver-Marshall, Inc., Chicago: "I have had your 712 tuner for about ten days now ... over a hundred stations have been received ... I live within a mile of the towers of WSM (650 kc.) but am able to bring in WMAQ (Chicago, 670 kc.) and KPO (Oakland, Calif., 680 kc.) . . . I find I get results on a short indoor aerial which you claim only when using a longer outdoor antenna ... I am using 30 feet of rubber-covered wire tacked up in the attic ... Some night I may put up a decent aerial, connect it as you direct and bring in China." —M. G. Horkins The custom-built S-M 712 used by Mr. Horkins is a straight one-dial all-electric tuner, as easy to operate as the cheapest radio. Whether it's a world- beating set for your own home, or a custom design to build for "fastidious listeners"—the S-M 712 so far overshadows competition that comparison be- comes ludicrous. And if You Prefer a Still Lower Cost— "Silver-Marshall, Inc., Chicago: "I received my 722 ... That receiver is certainly the best for the money—KDKA or WBZ without any heterodyning at blasting volume, or WRVA and WPG, or WJZ and WBBM, or WEAF and WMAQ. (All four are 10 kc. separations.) WJZ, WGY, KDKA and CKAC, 4OO to 600 miles away, are regular day- light features ... I will keep on boosting Silver- Marshall sets like I have been doing since four years ago."—Gleason Belzile, Rimouski, Quebec, Canada. The New "Boss of theAir"-S-M712 Far more selective and sensi- tive even than the Sargent Ray- ment 710, the new all electric single control 712, with band- Biter and power detector, stands far beyond competition regard- less of price. Feeds perfectly into any audio amplifier, the S-M 677 being especially suitable and convenient. The 712 can be easily mounted for use as radio tuner in a rack-and-panel amplifier installation; the super- lative quality of its reception makes it ideal for this purpose, while the low-impedance power detector works perfectly into any type of power amplifier. Tubes required: 3—'24, 1—*27. Price, only $64-90, less tubes, in shielding cabinet. Component parts total $40.90. 677 Amplifier Superb push-pull amplifica- tion is here available for only $58.50, less tubes. Ideal for the 712, since it furnishes alt re- quired power (ISO volts B, 2'/2 volts A.C.). Tube* required: 2—'45, 1—'27, 1—'8O. Com- ponent parts total $43.40. Skort Wave Reception Without Batteries L . A screen-grid r. f. stage, new plug-in coils covering the bands from 17 to 204metersu regenerative detector, a typical S-M audio amplifier, all help to make this first a. . short-wave set first also in performance. Price, wired complete with built-in power unit, less cabinet and tubes, only $64.90. Component parts total $44.90. Tubes re- quired: I—'24, 2—'27, 2—'45, 1—'80. Two extra coils, 131P and 131Q, cover the broadcast band at an extra cost of $1.65. Adapted for battery use (735DC) price, $44.80, less cabinet and tubes. Component parts total $26.80. Tubes required: 1—'22, 4—'12A. AH prices net. Silver-Marshall, Inc. 6403 West 65th Street, Chicago, U. S. A. Please send me, free, the new Fall S-M. Catalog; also sample copy of The Radiobuilder. in stamps, send me the If you're not getting THE RADIOBUILDER regularly — use the coupon! Big Opportunities This Year for S-M Service Stations SILVER-MARSHALL, Inc. 6403 West 65th St., Chicago, U. S. A* t 12 issues of The Radiobuilder 25 Issues of The Radiobuilder. S-M DATA SHEETS as follows, at 2c each: .No. 3. 730, 731, 732 Short-Wave Sets .No. 4. 255, 256, etc.. Audio Transformers .No. 5. 720 Screen Grid Six Receiver 740 "Coast-to-Coast" Screen Grid Four 675ABC High-Voltage Power Supply 710 Sargent-Rayment Seven 678PD Phonograph-Radio Amplifier 669 Powsr Unit No. 14. 722 Band-Selector Seven No. Is. 735 Round-the-World Six ___No. 16. 712 Tuner (Development from the Sargent-Rayment) _No. 17. 677 Power Amplifier for use with 712 Name_ Address... DECEMBER 1929 67