If you check the threads, you'll see that VAC is frequently mentioned as being among the very, very best when it comes to build quality, and perhaps without equal when it comes to tube gear. As for my personal experience, I have owned VAC Renaissance 140 mono amps for five years and have never had any problems of any kind.
Correct me if I am wrong, but doesn't the newer version of the Avatar run KT-88 output tubes? The KT-88 tends to sound great as pentodes go, but there have been a lot of cheap ones on the market over the years and they can go up like bottle rockets. VAC's KT-88 are reliable, as are, I believe, recent vintages of the Sovteks. This would be my only concern (and the price -- VAC gear tends to be expensive).
Correct me if I am wrong, but doesn't the newer version of the Avatar run KT-88 output tubes? The KT-88 tends to sound great as pentodes go, but there have been a lot of cheap ones on the market over the years and they can go up like bottle rockets. VAC's KT-88 are reliable, as are, I believe, recent vintages of the Sovteks. This would be my only concern (and the price -- VAC gear tends to be expensive).