Their are a few people that frequent this forum that own tube amps with their Axioms. I'm sure that a they will be more than happy to share their experience with you. I have a couple of them myself and haven't tried them with the Axioms. I own a set of Carver ct-7t that I purchase last year for $100 at a garage sale.

M80's VP150 QS8's Earthquake SuperNova MKV-15
Integra DTR-7.4 Outlaw 755 Outlaw M200's Outlaw ICBM