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How to Build a Two-Stage Detector-Amplifier Unit
By JOHN B. BRENNAN
TTfE BELIEVE that radio constructors are becoming more and more interested in building receivers that will produce signals of excellent quality. As Mr. Brennan, technical editor of this magazine, brings out in this article, it is not now so important just how much noise a receiver will deliver, or how far it can be heard, but the quality of the program it produces. . This unit, which is designed to fit with the two-stage radio-frequency amplifier unit described by the same author in this magazine for May, 1925, has been especially designed to give the best possible quality. The cost of parts is not high, and the constructor will find that assembly and wiring is quite easy. — The Editor
LOWLY but surely the trend in radio is swinging toward quality. We are learning that it is not how much, but how good that counts in radio.
There was a time when the radio store which had the largest horn sticking out its front window with a power amplifier behind it, assumed a kind of local radio supremacy due entirely to the pure force of the racket. Times have fortunately changed, and to-day we see many dignified if modest radio establishments equipped with individual listening-in booths where receivers are on display and demonstration.
So, too, the change has been felt in the design of radio apparatus. Parts and complete sets have been materially improved. Good voice and music quality and perfectness of
loud speaker reproduction have assumed their rightful importance in design and construction. That old term "tremendous loud speaker volume" is slowly slipping into the discard. It is being helped along by an occasional shove in the form of an amplifier which produces loud speaker signals with clarity and fidelity.
This paper describes such an amplifier.
WHAT DO WE WANT IN AN AMPLIFIER?
TO BE efficient, a detector and amplifier must have the qualifications of sensitivity, honesty of reproduction, ease of control, and must produce loud speaker volume sufficient for dancing. Its construction must be simple.
The sensitivity largely depends upon the type of tuner employed to tune the incoming