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Stereophonic preamplifier "Radio Engineering UP-001-stereo" since 1985 produced the Riga Radio Plant them. A.S.Popova. The preamplifier is designed to work as part of a complex of home audio reproducing radio equipment of the highest or 1st class. It provides not only the selection of the source of the low-frequency signal, its subsequent processing and amplification for listening, but also the choice of the source for recording on two tape recorders, overwriting from the first to the second and vice versa, operational control of the recorded signal. The switching system allows simultaneously with the signal amplification from any of the connected sources, to record it on a magnetic tape. The amplifier has a smooth and step volume control with switchable loudness, separate tone control at the highest and lowest audio frequencies, stereo balance adjustment. Main technical characteristics of the UE: Nominal output voltage, with a nominal load resistance of 10 kΩ - 1 V. The nominal frequency range is 20 ... 20000 Hz with uneven frequency response ± 0.3 dB. The harmonic coefficient is less than - 0.03%. The power consumption of the amplifier is 15 watts. Its dimensions are 430x358x88 mm. Weight 7.2 kg.