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Power amplifiers "Priboi-50UM-204S" and "Priboy-75UM-204S" produced from I quarter of 1991 Taganrog factory Priboy. Power amplifier "Surf-50UM-204С" or "Surf-75UM-204C" is the first domestic stereo tube UM. Its sound is perceived as particularly clear, transparent and clear, without the overtones inherent in amplifiers on the p / p. The advantage of the MIND over the semiconductor models is manifested when it is used with domestic high-quality speakers of the same class. Any of the amplifiers is designed to amplify from: a preamplifier, a turntable with an equalizer, an equalizer, a tuner, a tape recorder, an electric guitar and other signal sources. In the UM there are: a socket for connecting the program source; output terminals for connecting speakers of the left and right channels to 4 and 8 ohms; power on and off button; network enable indicator; input level control separately by channel. Nominal output power of each channel at AC resistance 4/8 Ohm, not less than 50 (75) watts. Minimum emf input: 0.6 ± 0.15 V. Maximum output power, with acoustic impedance of 4 and 8 ohms, not less than 60 30 W (80 30 W). The frequency range is 20 ... 20000 Hz. Total distortion 1%. Common intermodulation distortion under normal conditions is 2%. The crosstalk attenuation between stereo channels in the frequency range 250 ... 10,000 Hz is 40 dB. The signal-to-weighted noise ratio for the linear input is 86 dB (92 dB). Input impedance 33 kΩ. Power supply - 220 V AC network. Power consumption ~ 250W. Dimensions of the amplifier 430x400x163 mm. Weight 18 kg.