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Since the beginning of 1957, the subscriber loudspeaker "Signal" has been produced by the artel "Stapm" (later a factory of metal products), the city of Gomel. BSSR. Subscriber loudspeaker '' Signal '' is a standard receiver of programs of wired broadcasting with a voltage in the line of 30 volts according to GOST 5961-51. Rated power input 0.25 watts. The audio frequency range is 200 ... 5000 Hz. Radio weight 3.3 kg.