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?
aberyclark
Yes, Quicksilver is really a contender for build quality. I might explain that QS products are not so much overbuilt as they are properly built. You pay for sounds, not pounds. Even so, they have their own heft to them.
I had owned many well-known tube amps. Last year i discovered Mastersound and my perception totally changed. Best tube gear I ever owned.
Now i have the compact and the monos PF 100. I believe that nothing mentioned here can even be compare with mastersound level.
Regards
VAC...point-to-point wired, great customer service, Kevin Hayes replies to even the smallest queries. ARC does that too but only takes a long while to get replies back and perhaps a bit let down by the dealer support.