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In 1936, the net receiver lamp SI-646 was released in a limited series by the Moscow Ordzhonikidze Electromechanical Plant. The SI-646 radio receiver (Network Individual, 6-circuit, 4-lamp, 1936) is a superheterodyne type broadcasting receiver with full AC power supply mounted in a common box with a dynamic loudspeaker and a rectifier. The receiver belongs to the all-wave, since in addition to receiving long-wave and medium-wave stations, short-wave broadcasting stations can be received at the receiver. The receiver covers the ranges: 19 ... 50 m (shortwave), 200 ... 550 m (medium wave) and 714 ... 2000 m (longwave). As the name of the receiver itself shows, it has 6 resonant circuits, of which 2 are the loops of the received frequency and 4 are the loops of the intermediate frequency. The role of the heterodyne, the first detector and the mixer is performed by the pentahydride CO-183. The radio frequency circuits, including the heterodyne circuit, are tuned with variable capacitors, the rotors of which are mounted on a common axis and rotate with a common vernier. The intermediate frequency is amplified by a high-frequency pentode of the CO-182 type. The intermediate frequency voltage, after amplification by the CO-182 lamp, is supplied to the diode part of the dual diode CO-185 triode, the triode part of which operates in the first stage of the LF amplification. In the final (second) stage of amplification of the low frequencies, the pentode SO-187 operates. The receiver has a manual as well as automatic volume control, tone control (tone), selectivity control. The receiver can also be used for replaying recordings by external electric power lines.