[William Sommerwerck]

Not necessarily. They're all "class A" except for those that
use the most basic op amp configuration. But it sure sounds
good in the marketing literature.

In fact, I'd say that if they bother advertising that the thing is
class A, that's a bad indication. Not as bad as putting
"professional" in the name of the product, mind you.

Isn't "class A" a way of saying "discrete devices, no ICs"?

With the right op amp (and a heat sink), you can "pull up" the output stages
into class A.