need drivers to be faster than outputs (all bjt)?

[h_a]

They will accumulate the 180° of phase shift.

Ok, I should have been more clear. I meant 180° phase shift with gain. There are a couple of mosfet amps out there that don't have any form of frequency compensation! I have not yet seen a bipolar amp without compensation.

I would be interested how fT affects stabilit. Overall I have the impression that compensation is largely an empirical thing. That's ok, it makes my life a bit more complicated however, since I try to sort of design stability by trying to choose the right parts - without actual building and measuring (I can't do that at the moment).

All the best, Hannes