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10 RADIO AGE for November, 1927
1928 Nine-in-Line Super-Heterodyne
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Figure 4 — Schematic diagram of the Nine-in-Line.
THE H F L Nine-in-Line SuperHeterodyne certainly needs no introduction to radio fans since in the past two years it has been one of the leading receivers. This receiver delighted thousands of radio DX fans in its remarkable ability to extract stations in remote and distant corners of the United States — and even foreign stations — through the conglomeration of powerful local broadcasters in congested areas such as represented here in Chicago. No doubt many who built the set last year feel that it couldn't be improved upon.
There are refinements in the 1928 receiver which will attract the man who has already built the set and the new prospect for a receiver capable of getting distance under the present conditions and still preserve the fine qualities of music and speech as they are presented from the broadcasting stations. The outstand
ing refinements are the new audio transformers which have the characteristic of reproducing all the notes with uniform intensity so that an orchestra, for instance, will sound like the orchestra playing in the ballroom of a large hotel and not like an orchestra playing the same melody yet distinctively different from the original. That is, the low notes, mediocre notes and high notes are relatively the same as they burst forth from the loud speaker. The new Remler drum dials are here incorporated giving the set a snappy finished appearance and making the tuning easier.
The simplicity of assembling and wiring the set, which has been in the past one of the outstanding features, is well retained. All the leads are extremely short and direct which also adds to the electrical efficiency of the receiver. As can be readily observed from the name Nine
in-Line, nine tubes are used in the receiver. A first detector, four intermediate stages of amplification (using three iron core untuned transformers and two sharply peaked transformers), one oscillator, one second detector and the conventional two stages of audio frequency.
The receiver built in the laboratory of the RADIO AGE a few weeks previous to the writing of this article produced very gratifying results. The first night it was tried, a Sunday night, stations from coast to coast were easily tuned in. KFI, the west coast criterion, was brought in with ample volume to fill a room with' music. It being Sunday night there were, of course, not quite as many local stations on the air as on an ordinary week day night. The tone quality is very good. The set tunes smoothly without breaking into annoying oscillations and was as a whole very easy to operate. A very
Figure 1— Photograph of complete set.