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The power amplifier "Surf-75UM-104S" produced since 1993 Taganrog plant Surf. It is a copy of the UM "Priboy-75UM-204S." Designed to amplify signals from: preamp, electric player with equalizer, equalizer, tuner, tape recorder, electric guitar and other sources. In the UM there are: a socket for connecting the program source; clamps for connecting speaker channels at 4 and 8 ohms; power button; network enable indicator; input level control separately by channel. Rated output power at AC resistance 4/8 Ohm, at least 2x50 (75) watts. Minimum emf at the input of 0.6 ± 0.15 V. The maximum output power is 60 (80 W). The operating frequency range is 20 ... 20000 Hz. Distortion 1%. The crosstalk between channels in the frequency range 250 ... 10,000 Hz - 40 dB. The signal-to-weighted noise ratio for LV is 86 dB. Input impedance 33 kΩ. Food - the alternating current main. Power consumption ~ 250 watts. The dimensions of the MIND 430x400x163 mm. Weight 18 kg.