lots of older amps had bad reputations. Counterpoint, Sumo, Carver, Inner Sound, Melos, Audio Research, etc. I have repaired so many amps mostly because of the chassis design that could not remove the heat. Some of the circuit boards are just plain cheap. Some of them can be repaired with no worries, some, not so much. After 20 years, you should have a tech look at your amp and check the caps. Better caps are now available and going up a size if they can fit in, is also a good idea IMO.
Happy Listening.
Happy Listening.