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Since the beginning of 1956, the low-frequency amplifier "90U-2" from the mobile kit for dubbing films "KUUP-56" has been manufactured by the Leningrad plant "Lenkinap". Amplifier "90U-2" is intended for sounding movies in conjunction with a mobile set (installation) "KUUP-56" and also for music and speech sound of places for demonstration before the start of sessions. After working out the resource and write-off amplifiers were used for domestic purposes. The amplifier has a rated output power of 10 watts, maximum 15 watts. The nominal range of reproducible sound frequencies when viewing narrow-film (16 mm) movies 80 ... 4500 Hz, widescreen (35 mm) 80 ... 6000 Hz, when playing phonograms of sound in living conditions 80 ... 8000 Hz. Powered by AC 110 V directly or through a step-down transformer. Power consumption 110 watts.