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Short-wave converters (converters) "KUB-1" and "KUB-10" from the middle of 1930 and from the beginning of 1931, respectively, produced the Leningrad Apparatus Plant named after "Kazitsky". The "KUB-1" and "KUB-10" converters are designed to convert the shortwave range from 14 to 200 meters into the long-wave range using a bottom-wave receiver as an intermediate frequency amplifier with 1 or 2 frequency conversions, depending on which receiver is used, direct amplification or superheterodyne . The KUB-1 converter is built according to a complex pattern, and the KUB-10 converter is simpler. The latter is intended for individual radio amateurs. Both converters are assembled in the KUB-2 radio receiver.