Seventy-five years ago this month, the June 1941 issue of Popular Science carried the plans for this simple one-tube receiver suitable for long wave, medium wave, or short wave.

The set used a 1E7G dual pentode tube, used as a push-pull detector.  The design called for two plug-in coils for each band.  In fact, as can be seen from the schematic, the entire circuit is basically doubled.

Click Here For Today’s Ripley’s Believe It Or Not Cartoon