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A preliminary amplifier "Corvette UP-028S" from I-kv 1986 produced the Kirov plant "Ladoga". The stereo preamplifier '' Corvette UP-028S '' is designed for high-quality amplification, switching and frequency correction of signals from a turntable with an electromagnetic pickup head, a CD player, a tuner, a tape recorder, etc. amplified frequencies. More information about the parameters in the instruction manual.