No, not at all.dangomles said:
Good tubes last a surprisingly long time. There's vintage tube amps around that are still run with their original tubes from the '60s (although i wouldn't do that,lol).
Really, it won't be a problem at all, especially with a quality amp like a Cornford.
And 6 watts of Tube power is surprisingly loud. I've got a 12 watt head that i made myslef and it uses a single KT66 tube and that thing is stupidly loud !
It's not going to be a gigging type volume but you could always mike it up if you wanted to use it live.
Rob Balducci uses Cornford i think and Richie Kotzen has his own signature head now as well.