absolutely. It also depends on methods of applying NFB. In a PP circuit I am quite the opinion that the NFB ought to be PP or balanced as well. That requires the rest of th amp be built PP. So this puts certain constraints on the design.A variable amount is another nice trick. I think that my opinion of what is the best changes from recording to recording. Let alone week to week. It does stay fairly centered about a general level though...
regards,
Douglas