Radio Broadcast (May 1928-Apr 1929)

RADIO BROADCAST ADVERTISER 237 THE NEW LINCOLN 8-8C LCEJ IT /■SCREEN /■GRID "tubes 0 1 1 # TUN ABIE I F STAGES 400 MILES IN DAYLIGHT 2000 MILES AT NIGHT J CN A 1<S-rC©T ANTENNA! INSIDE A STEEL BANK BUILDING THE Lincoln 8-80 gets its remarkable results from a new principle as simple as it is radical — just merely that you tune the "onespot" intermediate amplifier stages after your set is built, instead of our doing this at the factory when we don't know how you're going to build your particular set! If you've ever built a super, you know what it is to use "laboratory matched" transformers that turn out to be away off when your set is done — you get squeals, broad tuning, station repeats — but try as you will, you are at the mercy of "factory matching." In the 8-80 four screen grid tubes are used, three in the tunable "one-spot" intermediate amplifier. And that's the heart of the set. In it are four new Lincoln 101 Transformers, each with its own little tuning knob on top. And when you finish building your set you don't pray that your i.f. amplifier is matched — you just turn the knobs and match it for your own particular tubes and circuit conditions. And at the same time you are correcting for all variations in peak frequency due to built-in transformer capacity, varying constants in different tubes, and various capacity and feed-back reactions due to slight differences in wiring layout — all these things which have helped to ruin the team-work of so many sets of "lab oratory -matched" transformers. Every such influence is immediately overcome, once you have tuned the four stages to peak with each other. To do that is just as simple as tuning once the several dials on a t.r.f. set — and when it's done once, your i.f. stages are permanently matched. Then if you want to change your intermediate frequency, you can do so by another turn of the same four knobs — selecting anything from 300 to 500 kc— all "one-spot" frequencies. Yet this obviously sensible amplifier is entirely different from anything that has been offered in the past. Not alone in selectivity, though, is the 8-80 supreme. Its new Clough audio system gives it better tone, more volume and less distortion than any old-st>le transformers possibly can — an effective transformer ratio averaging 4.4 to 1 — 30% greater in each stage than many more expensive transformers. And with all this — a true tone fidelity, giving positively uncanny realism. Even for "eye value" — hardly to be hoped for in the average super — the 8-80, when neatly housed in the beautiful Lincoln 112 twotone metal shielding cabinet '39.25 extra) compares favorably in appearance with the most beautiful factory jobs. It is these features that make the 8-80 the sweetest eight-tube super you've ever tuned. And that it positively is. In the Lincoln offices in a steel-reinforced-concrete building — the most difficult type for radio reception— the 8-80 plays stations 1000 to 2000 miles away on a hot summer night, and several hundred miles away during the day! All this is with all Chicago stations operating, and with only a 15-foot inside antenna! Pittsburgh, Davenport, Nashville, New Orleans — generally these and more come in without any antenna at all! The price of the complete kit for the 8-80 is #92. 65. And the set you build from it will give these same results, for every set built tunes easily and positively to peak efficiency, thanks to the new principle of William H. Hollister — an old-timer in the game who demonstrated "wireless" to college professors before Marconi first bridged the Atlantic. And all his experience, ranging over a quarter of a century, has gone into the 8-80. It ought to be some set — and it is! Lincoln guarantees that the 8-80 will give better results than any other eight-tube super you can build! If you want an evening full of straight-from-the-shoulder superheterodyne dope written by an engineer who has played with every super going in the last few years, send 25 cents for William H. Hollister's "Secret of the Super," using the coupon below. Have you seen the new Lincoln power supplies? There are two: one for H voltage only and one for A, B, and C voltage for AC tubes. Each one comes in a beautiful brown crystaline steel shielding case. 'B current of 50 to 60 m.a. plenty for any 10 tube set— at 180 to 200 volts, with 22V2> 90, and 135 available— also 22-90 variable. Type HOB lists at $36.00. type 110ABC at $39.00. They're fully guaranteed, and are described in detail in the big catalog which the coupon below will bring you. LINCOLN ENGINEERING SERVICE ON STANDARD KITS We can supply promptlv all high-grade kits such as Silver-Marshall Products Tyrman Radio products Scott World's Record Super H. F. L. Isotone LINCOLN RADIO CORPORATION 329 SOUTH WOOD ST. — CHICAGO ILLINOIS. Setbuilder agents are wanted in every community. We have a most interesting plan which you will find highly profitable. Write for complete details, or use the coupon. LINCOLN RADIO CORP., 329 South Wood St.. Chicago. 111. Send me your big free catalog, listing a complete line of 1929 kits for custom building. Let me have details of your agency plan. Enclose find 25c. for which send me William H. Hollister's new book, "The Secret of the Super." Mail the coupon NOW! Name