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
Too bad we are in Covid world. I’d love to hear the Carver M350, especially after rolling all my Line Magnetic LM805ia tubes. I might be biased (pun intended) but I can’t imagine being much happier than I am now. Hopefully, someday I’ll be able to discover what the differences are between the 2. 
IMO/IME building a power amp, especially a tube amp, is best done point to point. This ensures that the amp will have the longest life. But I also find it important to have a nice build quality and appearance internally, since its actually easier to control stray capacitance, which can mess with high frequency bandwidth. Plus its nice to see that people take pride in their work. A technician's signature or initials is always a good thing to see.