I have owned tube power amps for over a year and nothing has ever come close. I own Cyber 800s like Mr Stark. IMHO the real magic that tubes can provide is only found if you you use tubes in the output section. I have a fabulous tube integrated as well now, a Jadis DA-60. It too has that special quality. I tried the tube anywhere in the system approach with results that don't even hint at what tubes can do.
Tubes are a relative pain in the ass if you roll them and get addicted to that. I did and now can't even recall all of the tubes I own. Many old tubes are just not functioning correctly no matter what the emissions or transconductance are. I have enjoyed them more than found them a burdensome. If you just want stock that works well in my experience for most amps. These are much less prone to give you you a hard time as almost all are equipped with new tubes. The attraction to Old tubes is justifiable in terms of a move toward the better but has its risks.
Otherwise you have hit all the common beliefs.
Tubes are a relative pain in the ass if you roll them and get addicted to that. I did and now can't even recall all of the tubes I own. Many old tubes are just not functioning correctly no matter what the emissions or transconductance are. I have enjoyed them more than found them a burdensome. If you just want stock that works well in my experience for most amps. These are much less prone to give you you a hard time as almost all are equipped with new tubes. The attraction to Old tubes is justifiable in terms of a move toward the better but has its risks.
Otherwise you have hit all the common beliefs.