Adcom GFA-545 (Nelson Pass version). Lusted after them in the 80’s when they came out, but could not afford them. Bought one used, and ultimately decided it was just too ‘dry’ and a bit grating to my ears. Sold it off to a local Adcom fan.
Replaced it with a B&K 125.2 and it was like night and day to my ears….so comforting in its presentation. It was like ‘home’. Still like most old B&K amps for their presentation, have one in my bedroom system.