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The sound-reproducing device "ZU-430" was produced since the beginning of 1970. The device consists of a low-frequency amplifier and two acoustic units and is designed to work with electromusical instruments, a microphone, and any other sources of sound. The amplifier device is assembled on radio tubes and has a nominal output power of at least 20 watts. The range of sound frequencies reproduced by acoustic systems is 30 ... 15000 Hz. Food from a network of 127 or 220 V. Power consumption 85 watts. The dimensions of the amplifier are 305x210x175 mm, one of the speakers is 800x500x250 mm.