Radio Broadcast (May 1928-Apr 1929)

240 RADIO BROADCAST ADVERTISER A STATION EVERY TEN KILOCYCLES A' STATION tuned in for every ten kilocycles — a hundred stations heard in one summer evening, in the heart of Chicago interference — that is the performance record of the 710 Sargent-Rayment Seven — latest masterpiece of these inventors of a unique receiver system of past popularity. The 710 Sargent-Rayment Seven is a precision laboratory radio receiver for the veteran fan. It has been designed thruout as such. It is like a battleship stripped for action, shorn of every piece of surplus gear. The thick aluminum shielding and chassis, finished in satin silver and trimmed by black instrument name plates with white engraving gives to the appearance a beauty and dignity in keeping with the set's fine performance. Electrically, the receiver consists of five sharply tuned circuits in a four stage screen grid R.F. amplifier, all tuned by a single illuminated drum, and provided with individual verniers. One knob turns the set on and off, and controls volume from zero to maximum. There are no other controls. Following the R.F. amplifier are the detector and the A.F. amplifiers, using the famous 220 S-M audio transformers which provide unequalled tone quality and high volume in a perfect circuit balance. Each circuit is individually shielded, bypassed, and isolated from all others. The set goes together simply and positively, with clear direct wiring. It is a ioy to build, so workmanlike is its design and layout. To the fan who appreciates and values really fine performance, in a truly precision receiver of great individuality and distinction, we unhesitatingly recommend the 710 Sargent-Rayment Seven. The kit for this receiver, approved by the designers and exclusively manufactured by Silver-Marshall, Inc., is priced at $120.00 complete with cabinet. Note: All S-M distributors are being supplied as rapidly as possible ^vith the Approved Sargent-Rayment kit, but since speed of production is necessarily limited by the extreme precision required in every part of this unique receiver, orders should be placed at once by those desiring to be early on the ground with the Sargent-Rayment Seven. 740 COAST-TO-COAST FOUR TO the thousands of fans for whom the four tube, R.F. amplifier, regenerative detector and two stage audio amplifier is the time-tested standard of receiver comparison, the new Silver-Marshall Coast-to-Coast Four offers the finest performance yet attained with this remarkable circuit. A screen grid R.F. amplifier stage, immeasurably finer coils than ever before, the new Clough high-gain audio system, and an all-metal assembly like those of the finest of ready-made sets, make the "740" the biggest $51.00 worth of radio set you've ever listened to. Through summer static, the Coast-to-Coast Four plays on the speaker New York, Florida, Texas, and California stations, cutting through local Chicago interference only 10 or 20 K. C. away. Its tone quality is such as only S-M transformers can provide. Housed, like the 720 Six, in the new S-M 700 table-model metal shielding cabinet, it harmonizes beautifully with any home furnishings. Despite this demonstrated superiority, in every respect, over all other sets in its price class against which we have tested the 740, the complete kit of all approved parts costs but $51.00; or the 740AC kit, $53.00 complete. The 700 cabinet is $9.25 additional. We go emphatically on record that no matter what set you build or buy, the 740 Coast-to-Coast Four is the best dollar for dollar value you can find around fifty dollars. It goes together easily and simply, performs with a vengeance, and for the professional setbuilder provides a low-priced set that will outdemonstrate ready-made sets at twice its price. Fiil in the coupon on first page of this advertisement, and mail it now. It will bring a big free catalog telling about these and other S-M circuits and parts. SILVER-MARSHALL, INC., *> Audio Transformers just Twol/earsinJlduancef WHEN the bewildering story of the radically new S-M audio transformers burst upon the 1928 R. M. A. Trade Show it brought incredulous wiseacres to the test bench where they were being tested against the highest priced instruments on the market. One man after another turned away, convinced beyond question that here was the greatest actual advance in quality of reproduction brought forth in years. These new S-M audios are the firs transformers to give freedom from the hysteretic distortion found in all other types. They've got tone, punch and volume that will make you gasp and wonder how you could ever have been content with anything less. The new S-M 225 first stage and 226 second stage types at $9.00 each are utterly unequaled. Their two stage curve is shown at E, with its rising base characteristics and 5,000 cycle anti-hiss cut-off. The smaller 255 first stage and 256 second stage types are unconditionally guaranteed finer than all others on the market. Compare their curve D to three sets of standard eight and ten dollar transformers at A, B, and C under equal operating conditions. S-M transformers have been acknowledged leaders for two years— now these new types again place S-M performance just two years ahead of the best — yet you can have this finer performance in every set you build, or install it in your present set, at less than average transformer costs! 838 West Jackson Blvd., Chicago, ML