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A battery-powered, single-tube radio receiver, with a regenerative "BV" contact detector from 1925 to 1927 inclusively produced the Electrosvyaz trust, specifically the Moscow Telegraph Plant (former Morse). The electrical circuit of the model does not contain an expensive variable capacitor, which reduces the cost of the receiver. Feedback is chosen in such a way that an anode voltage of 40 volts is sufficient for a lamp with a current of 5 ... 6 milliamperes, which was cost-effective for this type of receivers. The receiver is mounted in a wooden box with a polished black front panel. The wavelength range is 300 ... 1800 meters (in practice, 280 ... 1875) .The wave tuning is done in steps, by switching capacitors and smoothly using a variometer. Feedback at reception on the lamp is regulated by the communication variometer.When using the receiver as a detector one, the lamp must be extinguished and a detector is inserted into the corresponding sockets. The receiver allows the lamp to receive 1-2 head phones from our powerful broadcasting stations at significant distances up to 700 ... 1000 kilometers, as well as a number of allied and foreign stations, in the absence of large interference.