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The transmitting amplifier "U-100U4.2" was produced presumably since 1975 by the Slavgorod plant of radio equipment. The amplifier is designed to amplify and mix audio signals from various sources with a further broadcast of the amplified signal. Rated output power 100 watts. The output voltage is 30 and 120 V. The reproducible frequency range is 50 ... 10000 Hz. Power consumption 400 watts. Dimensions 574x246x308 mm. Weight 21 kg. Included with the amplifier were 2 MD-200 microphones, a spare parts box with spare lamps, light bulbs, transistors and fuses. Produced amplifiers and lamp indicator.