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The low-frequency amplifier "UM-3" was planned for release in 1932 by the Kazitsky hardware plant. Amplifier LF "UM-3" is designed for small radio broadcasting nodes as the main or terminal. The amplifier is fully powered by AC power. The maximum output power of the amplifier is 3 watts. The amplifier works both from a low-frequency output of any radio receiver, and from a microphone.