pmbuko, ok, I may have learned something ;-) My amp is A/AB and warms up even without signal, as far I understand because in class A the transistor are amplifing no matter whether there is signal or not [I'm good in software, here I'm out of my depth so I may give wrong reasons for right things again ;-) Anyway, if it's warm, after 3-4 hours, there is a difference, not earth-shattering but enough to matter.

Interesting aobut the 60A. Yes, I didn't remember that of course you ain't pushing 220V to the speakers ;-)

--- tony