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Amplifier switching device "Harmony-70" was produced since 1971. UCU is intended for stationary use of vocal-instrumental ensembles as an amplifier of signals from an electric guitar, organ and microphone of a soloist. In the amplifier are provided; six inputs for different types of signal sources combined in pairs in three groups. Arrow level and overload indication, switching on and adjusting the '' vibrato '' mode in depth and frequency, decreasing the volume level by 10 dB, adjusting timbres in the HF and LF for each of the three groups of inputs, adjusting the volume level of each input, general volume adjustment , two outputs to speakers. The range of amplified frequencies is 20 ... 2000 Hz. SOI - 2%. Output resistance 2.25 ohms. Rated output power 70 W, maximum 150 watts.