1969 Radio Shack “P-Box” Shortwave Kit

1969JanEEFifty years ago this month, the January-February 1969 issue of Elementary Electronics reviewed the Science Fair “P-Box” shortwave receiver.  The three-transistor set used one transistor as regenerative detector, with the remaining two serving as audio amplifiers.  With interchangeable coils, the set covered 3-40 MHz.

I had one of these, and even though it made sound, I never did pull in any shortwave stations. I did manage to get some overload from local FM stations. I suspect if I had been more patient with the regeneration control, I actually would have received some shortwave.