Marantz AM/FM 4 channel stereo receiver model 4270. From the year 1973 to 1978. Sold for $699.95 October of 1974. RMS Watts Per Channel 25x4 or 70x2. Features, Dolby system meter, play cal L or R selectors, record level L or R, 400hz tone, high filter, loudness on/off, FM muting, speakers, main or remote, modes, dimension, Dolby Nr selectors, for record play and FM, headphones front and rear, and both signal and tuning meters, too many features to name. Neat quadraphonic stereo receiver!