Bret Ludwig wrote:
High bias AB amps operate in class A through most of the power range
they spend all their time in, giving the advantage of Calss A operation
where it is needed, and rather than running out of power when this is
exceeded they simply transition into Class B.

This is true. The problem, however, is that although the distortion may
be much lower in class AB than in class B, the distortion spectrum is often
less pleasant, at least to my ear. I often find a given output stage sounds
better biased into class B than up higher into class AB.

For low power studio-grade applications, though, there's no reason not to
just go whole-hog and run everything Class A. Electricity is cheap.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."