Dear @hiendmmoe : I owned and own several ML amplifiers and I can tell you that if you have the quality level r00m/system ML were top tier amps with nothing to envy today very expensive amps like Dartzeel.
I own a pair of monoblcks 20.6 ML and here in my room/system and with other audio friends listened sessions not only competes with Dartzeel or Pass and D'Angostino but outperformed in some areas.
At least my samples ( 30+years design. ) are a true challenge to other today amps.
Btw, I like a lot your Utopia's. Btw, too your cartridge model is not Umani but Umami Red.
Looking to other gentleman posts in this thread I think that maybe their those times room/system just were not good enough for ML amps or your MUSIC/sound targets/priorities are extremely special.
I can't speak for today ML because I have not yet the opportunity to give an audition.
Btw, in 30+ years my amps never failed and been true pure Class A runs really hot and in my city the temperature is not cold and I have not air conditioned.
The 20.6 design is a bullet proof one.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.