Radio Broadcast (May 1927-Apr 1928)

Record Details:

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RADIO BROADCAST ADVERTISER 239 Just as the 220 transformer, compared with all other makes, gives you the sense of Gibraltar-like sturdiness and dependability truly in a class by itself, so does its performance far outclass that of other transformers. The Finest Tone — and complete A. C. operation. Complete light socket operation of the Improved Shielded Six using A. C. and power tubes is an accomplished dependable fact. You may build either the battery model with standard tubes or the A. C. model with the new C-327 and CX-326 tubes — and at a cost cf less than half what you'd pay for nearly equivalent performance in a factory-built set. Every one of the thousands who built last year's Shielded Six said the same thing — • "The Six has the finest tone I ever heard." And now the new and improved 1928 model of this famous receiver, with the same fine tone as the original, and tremendously improved selectivity and distance getting abil' ity is available for light socket, battery, or eliminator operation. Above all the Six is guaranteed to have finer tone than any other set you can build or buy. The 630 Shielded Six kit in the battery or eliminator model is $95.00 and for complete light socket operation $99.00. We Could Charge But a Better Tram Can't Be Made IMITATED everywhere — never equalled — the S-M 220 audio transformer stands out to-day as the finest for audio amplification that money can buy just as it did when introduced a year and a half ago. The 220 has been copied in one or more of its characteristics by every high-grade transformer put on the market since then — in the rising low note or in 5000 cycle cut-off, features first offered by S'M. That's proof that the principles the 220 introduced are right — that the market is still trying to catch up with the leader. Don't be misled by exaggerated claims — for it takes plenty of core and wire to make a good transformer. The 220 has from 25 to 50 per cent more steel and copper in its construction than any other transformer on the market. That alone means the high primary impedance through which real bass note amplification is made possible. That's why S-M 220's and 221's are specified in more popular receiver designs — why they have outsold every other transformer in their price field. That's why they're sold on an unconditional money-back guarantee to give better quality than any other audio amplifying device available. We could charge from 25 to 50 per cent more than we do, but at no price can you get a better transformer. The 220 audio is $8.00, and the 221 output is $7.50. They are priced low, but, you can't buy a better audio coupler at any price, for there's none better made. We can't make the 220's cheaper but if you desire a transformer somewhat lower in price, taking up a little less room, and with a little less core and wire, the new 240 audio and 241 output transformers are available — superior to most other transformers, and far and away ahead of anything in their price field. They have the same general characteristics as the famous 220's and 221's, but provide slightly less accentuation of frequencies below 80 cycles. They have the same 5000 cycle cut-off for which 220's are famous, eliminating the objectionable whistles and heterodyne squeals of congested broadcasting. The 240 audio sells for $6.00 and the 241 output at $5.00. Hard to beat at any price, they are impossible to equal at these prices. And — you can bring your old set up to the minute using them — they're small enough to fit in most anywhere. 328 Super Power Transformer A heavy power transformer for either full wave or half wave rectifiers — for UX-281 (or UX-216-B) rectifier tubes. Will furnish 480 volts at 100 milliamperes of thoroughly filtered direct current using two UX-281 tubes, the S-M 331 Unichoke, and only six microfarads of filter condenser. This is power for a 210 push-pull amplifier at full voltage and to furnish receiver B power as well. Consists of two 550 volt secondaries, two 75 volt, i\ ampere filament windings and one if volt, 2 ampere filament winding for UX-226 tubes. Price $18.00. SILVER-MARSHALL, Inc. 838-B West Jackson Blvd. Chicago, III. Only a few of the real S-M developments are listed here. ro;i in stamps will bring you more real information on power equipment, A. C. operation, and other pertinent subjects than you can read in a week. The A. C. Improved Shielded Six— a completely light socket operated batteryless set usina the new A. C. tubes. It's illustrated above, with its complete dry ABC power unit— less than 7 inches square. Price, 630 A. C. receiver kit, $99.00, and 652A, ABC socket power kit, $34.50. SILVER-MARSHALL, INC. 838-B West Jackson Blvd., Chicago. Please send me all data on S-M audio transformers, power equipment, and new A.C. improved Shielded Six. Hame . . Address