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Radio "KUB-4M" since 1938 produced the plant to them. Kazitsky. The KUB-4M short-wave radio receiver (1-V-1 with a regenerative detector) operates in the range from 10 to 200 meters. Ranges are switched by replacing a set of 5 pairs of interchangeable coils. Telephone and telegraph signals can be received. The radio works on head phones. Power is supplied from the battery voltage of 4 V and the anode 120 V.