The young man shown here, presumably a student at a school that starts with N, has earned the respect of both his female and canine companions by putting together this simple one-tube receiver from the July 1948 issue of Popular Mechanics.

While everyone is impressed with the loudspeaker volume filling the room from strong local stations, he has a little secret.  The set was simplicity itself, since it’s really just a crystal set with a 117N7 audio amplifier driving the speaker.  Tuning is accomplished with a slider on the tuning coil within, and the detector is a 1N34 diode.

He put the handsome little set together in an evening, and he’s now pulling in the signals.