Stamped: "Detector / Type A / No. W145 / DR. No. RW 50 A 133 A / W.N.Y. 1916". A three turret crystal detector with a 4-position sweep switch, two connecting screws ...

Perhaps the simplest radio one can build is the crystal radio. Using a diode as a detector, the design generally uses less than 10 components and no battery, getting its power to run from the radio ...

Marked: "Marconi's Wireless Telegraph Co., Ltd. / No. 180014 - London." Instrument is designed to receive code signals in the wavelength range of 200-2500 meters. Aerial tuning inductance normally ...

Gecophone crystal detector radio set no. 1, complete with instruction handbook, made by the General Electric Company Limited, British, 1923. Polished mahogany case with a lift up lid and ebonite ...