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Radio constructor "Fon-5" from the beginning of 1987 produced the Moscow plant "Elling". The set "Background-5" is a assembled board and a set of components for assembling a stereo preamp amplifier unit, which serves for high-quality amplification of signals with electronic switching over inputs and level indication. The range of amplified frequencies is 20 ... 20000 Hz. The distortion factor of 0.02%. Food 15 V. The consumed current does not exceed 50 mA.