1947 One Tube Matchbox Radio

1947OctPS1Seventy years ago this month, the October 1947 issue of Popular Science carried the plans for this simple one-tube receiver mounted on a chassis the size of a matchbox.

The set used few parts beyond the 1S4 tube. Tuning was accomplished by a 175-500 pF trimmer capacitor. The article noted that the small capacitor might not cover the full broadcast band, but suggested small plug-in coils to extend the range.

The set required a 1.5 volt battery for the filament, in addition to a B battery, which could be as low as 4.5 volts.



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