MC275 still and always is a great amp...Some build quality issues popping up with McIntosh over the last 10 years or so. I loved the sound and features of my 220 pre but it had tube socket and software issues. It would turn off and not respond to the remote or front panel controls a few times a month, just random, you didn’t know when it would occur, so I finally let it go.
Highest BUILD quality tube amps?
Not so much with sound...lots of ways to fine tune thru tube rolling, etc. I'm just curious which tube amps are built to last for many years with the least amount of repairs. I know Mcintosh comes to mind for longevity. I was snooping around on the web and Air Tight seems to be built like a tank and I've never read any poor repair histories. Luxman same thing. Any others come to mind?