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Variety amplifier with AS "Harmony-70M" was produced since 1985. It is intended for the sound of the average halls, accommodating approximately 200 people. Consists of UCU and two speakers of the same name. The amplifier provides high-quality amplification of signals from electronic musical instruments (rhythm guitar, lead guitar, organ) and microphones. The amplifier has: 6 inputs for different types of signal sources. Switchable arrow indication of signal level and overload. Vibrato mode controls in depth and frequency. The buttons enable the '' vibrato '' mode, reduce the volume by 10 dB, adjust the treble and bass for each of the three groups of inputs. Adjust the volume of each input. General adjustment of the volume level. There are two outputs to the speakers. Characteristics of the amplifier: Rated output power 35 W, maximum long-term power 70 W, maximum short-term power 150 W. The range of working sound frequencies is 20 ... 20000 Hz. The harmonic coefficient of 0.3%. Characteristics of acoustic systems: Rated power 35 watts. Frequency range: 63 ... 14000 Hz. Resistance is 6 ohms. The amplifier was produced in several design options, was modernized several times, therefore some batches differed from the base one with slightly different technical parameters.