1. Tube type is personal preference. I like 6L6's personally, but a lot of guys prefer EL34's.
2. Depends how much you play and how loud you play. For average use expect to change your powertubes every year, but you'll know when they're on their way out.
3. Exactly that. If you've got the volune up and the amp working hard, you'll move a lot of air.
4. Always let the tubes warm up with the amp on standby for a couple of minutes before hitting the play switch, and similarly give them a few minutes on standby to cool off before turning the amp off. NEVER use a tube head without a load (cab or a load box) or you'll blow the output transformer.
2. Depends how much you play and how loud you play. For average use expect to change your powertubes every year, but you'll know when they're on their way out.
3. Exactly that. If you've got the volune up and the amp working hard, you'll move a lot of air.
4. Always let the tubes warm up with the amp on standby for a couple of minutes before hitting the play switch, and similarly give them a few minutes on standby to cool off before turning the amp off. NEVER use a tube head without a load (cab or a load box) or you'll blow the output transformer.