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
Tube Research Labs  ( TRL )
... God Bless Paul Weitzel ... 
Completely in their own exalted league.
QuickSliver Audio, Have Mike Sanders 60 watts mono' amps  very musical amazing Value.  Very quite ! just love those amps , about a year old no problems  I am also testing his latest QuickSilver Headphone amp. WOW is the word it is built like a tank very musical and is probably one of the best tube headphone amps I have heard !
Atma-Sphere would be my suggestion. Great support even for older models out of production!
A friend of mine had an Audio Research ( hybrid) HD 220. After many problems with that amp I told him to check out Quicksilver.
He had never heard of Quicksilver so he went to Audio Connection and picked up the Mono 120 amps.
Driving his Proac D48rs it is one of the best systems that I have heard.
If you are looking for all tube amps I doubt you will go wrong with Quicksilver!
I've had my Audio Note Kageki 2A3 amps for 14 years without a problem.  Love these amps.