Quote Originally Posted by Marco View Post
Lol... As an aside, Anthony's got an original GEC technical manual, from the 1950s, which clearly states the position in relation to KT88s, Class A and push-pull valve amplifiers, details of which he's going to post later

Marco.
It's the same with solid state, bias to half the quiescent current needed & as one device gradually reduces in current, the opposite device increases.

At some point cutoff will occur, though if the output stage is biased to full class A this will only occur if there is a drop in impedance.

Assuming the output stage is biased high enough, it'll operate in full class A.


Admittedly the sonic signature of push pull & single ended are different, but so is the dissipation

While a single ended output stage will output mainly even order harmonics (which are musical), a push pull stage will tend to odd order harmonics. Though these aren't so musical, they'll be at a stupidly low level due to it being biased into class A...

Which is what it is all about


One big advantage of push pull is if it requires more current for the load it can be supplied, though it'll go into class B. A single ended stage will simply crap out (clip), as it can only supply the current it is set at on whichever side the current source is on.