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Radio battery type "KUB-4" since 1930 produced the Leningrad plant them. Kozitsky. The "KUB-4" radio receiver (developed by the Short-Wave 4-Lamp Shock Brigade) is a semi-professional receiver with direct amplification and is intended for operation at down-link receiving and transmitting radio stations and for receiving short-wave broadcasting stations. Powered by the receiver from DC sources. It has one high frequency amplification stage, a regenerative detector and two low frequency amplification stages. At the beginning of the 1940s, the plant consistently produced several versions of the receiver for use in the army and navy. The purpose of such receivers was determined by the letter after the number 4, for example, "KUB-4M" - the marine version.