Who makes the highest quality tube amps?


One scale of 1-10, 10 being best designed and constructed technically, personal sound preferences aside, who are the 8s, 9s, and 10s?

VAC, ARC, Atmasphere would seem like likely candidates I can think of. Are they ?

Where does Decware rank? Rogue? How about others?

SOme technical facts to help support any claims is appreciated please.

Durability and reliability matters to me here as much as anything. I would want my tube gear to continue to work as reliably as designed years down the road as well as up front.

THanks.

Thanks.
128x128mapman
Put Octave on your list if it is in your budget. They have a protection circuit that even if if a tube decides to show you a lightning show no other parts will be damaged. I'm speaking from experience. I've had 2 tubes that thought it was the forth of July. No problems as a result.
Mapman, You didn’t state the reason behind your post so I don’t know if your question is simply academic or you’re actually shopping for a low maintenance amp. If you’re shopping, another relevant question relating to durability is - how hard is the amp on tubes? Some amps, that are themselves very durable, burn through tubes more quickly than others.
Phaelon if the tubes tend to go up fast, that's a - in my book. I'd tend to agree that tube life is a key factor for reliability.