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Since 1931, the radio SK-33 has been produced by the Leningrad artel Radist. SK-33 is the most advanced radio receiver in the country at the beginning of 1931. The radio receiver is assembled according to a superheterodyne pattern on 8 radio tubes and is intended for a loudspeaker reproducing reception on a framework antenna of broadcasting stations in the range of 200 ... 2000 meters.