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
I have had VTL MB-450 Series III for many years with no service required.  They sound great and with the Auto Bias function you just turn them on and listen......
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I do use a sub in my system, I love deep bass...just a preference of mine. I was worried about bass with tube amps, however someone told me since I use a sub, I can always adjust the levels for whatever tube amp I get and get SS deep bass