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FIG.
A panel view of one of the first test models. The final form is practically the same with the exception that one rheostat instead of two controls all the tubes
A Good Four-Tube Receiver
Employing Neutralized Radio Frequency-Amplification, a Controlled Regenerative Detector, and Two Stages of Audio Amplification — An Efficient and Simple Receiver Using Cylindrical Inductances Which Can Easily Be Built
BY McMURDO SILVER
""THIS receiver is no great innovation in the point of circuit design, for it * employs the tried and true principles of radio-frequency amplification and controlled regeneration. As Mr. Silver brings out, his receiver is quite like the one known as the Knockout Roberts receiver, but this set uses cylindrical coils which, for some constructors, may be somewhat easier to build. The receiver produces results, for those in our laboratory on test, quite came up to the promises made by the author. The set has also something in common with that described by G. H. Browning in RADIO BROADCAST for December. Every part of the Silver receiver can be purchased in the open market and built and assembled by the constructor. — THE EDITOR.
DURING the last year and a half, there is no question but what the super-heterodyne receiver has been at the top of the list, from the point of view of the more experienced set-builders, but for those experimenters who desire "super" results on a small antenna, there have been only two other really satisfactory receivers to turn to, until the advent of the Roberts Knockout Reflex. These receivers were the neutrodyne, or those using some form of tuned radio-frequency amplification, and that good old stand-by, the now almost prehistoric regenerative receiver. The neutrodyne, after the "super", was the next most sensitive receiver, and with these two at the head of the list, the
regenerative circuit has suffered a gradual decline in popularity. Now, however, there is a tendency to combine regeneration and r. f. amplification, and receivers built along these lines may in time, supplant both the straight regenerative receiver and the neutrodyne.
The reasons for this are very excellent ones. Tuned r. f. amplification offers many advantages, but the sensitivity of a receiver employing this type of amplification is not as great as it might be if the set itself is to be kept in a stable operating condition. This is because regeneration, unless it be controlled to some extent cannot be used. The sensitivity of such a circuit depends in a very large measure