Marantz AM/FM stereo receiver model SR 4000. From 1979 - 1981. Rated at 50 watts per channel. Features, one phono input, two tape in/outputs, one auxiliary input, loudness on/off, muting, low filter, tape copy 1 to 2, speaker selector system one and two, tuning meter, also features led power watt indicators, separate bass mid and treble controls. A Marantz classic.