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Since 1925, the detector radio "Radio Amateur" has produced the Moscow Electromechanical Plant. For its time, it was one of the best serial detector receivers. The receiver is designed to receive broadcasting stations in the range from 160 to 1,560 meters (in practice 140 ... 1,800 meters), stretched into 4 sub-bands. Built on a simple scheme. The setting is made roughly by a sectioned self-induction coil (contact switch), smoothly by a variable capacitor. The alternating capacitor and coil are switched from short to long waves with a bipolar contact switch. Detector coupling changes in jumps. Applicable to interference from other radio stations, has good selectivity. With an antenna 40 meters long suspended at a height of 20 meters, it is possible to receive stations remote over a distance of up to a thousand kilometers. The receiver was assembled in a wooden case, dimensions 180x130x135 mm. The price of the receiver is 18 ... 20 rubles.