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FIG.
The rear view of the seven-tube "super". The photograph shows what an excellent layout can be secured using a standard 7 by 24-inch pane!. The small balancing condenser is shown between the
two variable condensers
Revamping the Silver Super-Heterodyne
Complete Instructions and Discussion on Changes Necessary to Adapt a DryCell Straight "Super" for Storage Battery Tubes — A Complete How-to-Build-it Article Describing a Super-Heterodyne Which Produces Remarkable Results
BY McMURDO SILVER
IN THE October, 1924, RADIO BROADCAST an article appeared by Mr. Silver, describing a super-heterodyne that operated on 199'$, had remarkable selectivity, and could be assembled from standard and easily procurable parts. In this article, Mr. Silver has answered a demand for a super-heterodyne of the same qualifications to operate with storage battery tubes. Experienced constructors, and those not so experienced will readily appreciate that this "super" is well worth the time necessarv to build it. — THE EDITOR.
SINCE the publication in the October RADIO BROADCAST of the description of the portable super-heterodyne receiver using dry-cell tubes and self-contained batteries, the writer has been swamped with letters from fans asking all manner of questions, and reporting results far in excess of what they had expected from the set.
Reports have come in from all sides, telling of phenomenal DX reception with this set and its exceptional selectivity and quality of reproduction, both from seasoned experimenters and from builders who had no previous constructional experience. One log
made by a man totally unfamiliar with radio who had built the set, listed thirty-three stations heard in one night, with loud speaker volume on an 1 8-inch loop. This was the second evening he had operated the set in his home, in a thickly populated Chicago residential district, surrounded by steel frame buildings. Another report came from a man who had built seven different super-heterodynes in an endeavor to get selectivity and DX reception in his home, located, within a radius of five miles of a number of powerful broadcasting stations. Suffice to say, that he finally found whr.t he had been hunting