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The low-frequency amplifier UO-5 (another name U-0.5) since 1932 has produced a hardware factory named after Kazitsky. The amplifier has an output power of at least 0.5 W and is intended for small radio broadcasting nodes with several Record-type loudspeakers (1, 2, 3). The amplifier can only transmit transmissions from the output of a radio receiver intended for reception of a loudspeaker or headphones. Amplifier "УО-5" ("У-0,5") can be used as an intermediate or preliminary to a more powerful amplifier.