Prima Luna has got my attention for the simple reason of point to point wiring. Circuit boards are only so good IMO. Boards do have a range of quality as far as material used, thickness of traces, etc. In the end though, it is hard to beat point to point.
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?