If I understand it correctly: the Accuphase class-A is a push-pull amp, the same as PASS LABS. Do they leave class-A at some level? How much class-A power does the A-48 deliver before drifting into AB?
@southofdallas This isn't a concern. If a class AB amp had an audible aspect where you could tell it was going into B mode, it literally would not be on your list.
If the amp is competent, the class of operation isn't important. The competence of the amp is! That is why there are class D amps that would do well on your list as well.