my advice to would be tube users, avoid the AV-200m it is not a pure tube amp...
go to your friends' house and listen to tube amps.
choice of tube amps depends largely on the ff:
1. size of your listening room
2. your listening habits, or how loud fo you play? do you want to go to 11?
3. sensitivity of your speakers in db.
audition is key.....trust only your ears....