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The complete stereo amplifier "Stalker" was developed at VNIIRPA in 1981. The development of this device was preceded by long-term research in the field of electro and psychoacoustics in order to obtain a sound as close as possible to the sound of musical instruments in natural conditions. In the amplifier, for the first time in domestic practice, timbre regulators for low and high frequencies with infinitely variable bending frequencies, a so-called pink noise generator, and a spectral balance controller for the signal are used to match the amplifier with speakers and acoustics of the listening room. The very low level of nonlinear (0.02%) and intermodulation (0.05%) distortion provides an exceptional picture of sound in terms of transparency and detail. The range of amplified frequencies is 20 ... 20000 Hz, the mismatch of the amplification of channels in the frequency range 250 ... 6300 Hz at any position of the volume knob is no more than 0.2 dB, the signal-to-noise ratio from a low-impedance input is 73 dB. It is possible to work with magnetic pickups with a moving coil, recording simultaneously to two tape recorders. The amplifier can operate for a long time with a rated output power of 100 W at a load of 8 Ohms, it is not afraid of overloads and short circuits on the output. Amplifier "Stalker" in the production did not go, but it was released several prototypes.