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Since 1931, the KUB-2 and KUB-3 short-wave radios produced the Leningrad Kazitsky Aparatny Plant. Radio "KUB-2" (figure on the right) is intended for receiving a radio station in the range of short waves from 14 to 200 meters. It is built completely according to the "KUB-4" radio receiver scheme but does not have a low-frequency amplifier and is intended primarily for radio broadcasting nodes. Reception is also possible on headphones. The case of the KUB-2 receiver differs from the KUB-4 receiver. The KUB-3 radio receiver (figure on the left) replaced the KKE-2 and KKE-3 radio sets and is intended for individual radio amateurs. The receiver is built like a KUB-4 receiver, but it lacks a high-frequency amplifier. The receiver also has a shortwave range from 14 to 200 meters.