4 channel amp. Aux/tuner/phono inputs/2ch-front/rear/4ch composer. 4ch-stereo/reverse/front & rear, f&r volume controls, bass/treble controls, 1/4 inch phones. Mono/stereo, loudness hi filter, remote/main switches. Modified all PS caps, upgrade/double values & output amp caps for transformer to run 24dbm pro out. AP improved power filtering & bandwidth response. This machine modified lower noise to be used as 4 channel, Neve/ class A +24dbm capable conversion. Has original manual & schematic. Does very tube like sound character. Silver face unit, faux wood cover. Light scuffs on top cover. 9 condition.