I always loved the early ST-140. I also liked the 442. If you know how to tune up these amps they’re something special. Also for mono blocks look into the Marantz MA700 (killer sounding amp). And if I may let me tell you about another sleeper, the Luxman M-113. This Luxman is so under rated it’s crazy. I take the top off, take off the feet and put it up on Tuning Blocks and this is one sweet sounding amp.
I should also add I have earlier Rotel integrated amps and Stereo amps (old transformer design), and some older Parasound, very nice amps.
MG