Pioneer AM/FM Fluoroscan series stereo receiver model SX-3500. From 1979 - 1981. Rated at 20 watts per channel. Features, tape in/outputs, one phono, aux inputs, separate bass and treble controls, and FM muting. loudness on/off, Also has a tuning meter, and both right and left channels digital power watt meters. One of pioneers low end units. Improvements were made on the next model up, the SX-3600.