Historical information

Crystal radios are basic radio receivers, which operate using only the power of radio waves to produce sound. They use a piece of crystal mineral to detect the radio waves. The sound they detect is very faint so earphones must be used, and they can only detect radio stations quite close by. They were popular before cheap transistor radios became common.

Physical description

Vintage crystal radio set, home made, on a wooden stand, consisting of:
* a coil (inductor) wound on a round wooden block;
* a tuning capacitor for selection of AM radio stations;
* headphones manufactured in Japan in the 1950's.
There is no antenna included with this set.

Inscriptions & markings

":Radio Headphone TK-24 2000 (ohms) Japan Tokyo Tsushinkikk"