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Since 1986, the preamplifier "Amfiton UP-003-stereo" has produced the Lenin PO named after Lenin. PU of the highest complexity group is designed for high-quality amplification, control and switching of stereo signals when working from different sources of phonograms and is designed to work with the PA. It has: the ability to quickly select sources of phonograms; discrete adjustments for high, low and volume, with the possibility of switching the depth of loudness and its deactivation; restrictive filters for high, low and infra-low frequencies; modes of stereo, mono, reverse; the ability to connect 2 tape recorders; the presence of two outputs for connecting the PA or equalizer. Brief specifications of UE: Operating frequency range 20 ... 25000 Hz. SOI in the frequency range 20 ... 20000 Hz 0.01%. Signal-to-weighted noise ratio for inputs: linear 90, corrective 76 dB. Bass tone range ± 12.5 dB, HF ± 12.5 dB. Power consumption 20 watts. Dimensions of PU 460x91x363 mm. Weight 6.5 kg. Price 230 rubles. A preamplifier was developed as early as 1982, and a small pilot batch was released, but serial production began only in January 1986.