IMO, there’s no substitute for class A bias output, whether it be tubes or SS. Think of a class b amp as a dragster idling at the start line and a class a biased amp reved up to 8K rpm. The flag drops. The idling car driver, then puts the throttle to the floor and can go quite fast, however, the car that was reved up to 8K rpm simply drops the clutch and is gone in a flash. May be a weird comparison, but the class a amp is always wide open sitting there just waiting for a signal. It’s very quick. No pause or sluggishness to reproduce that cymbal, snare crack or bass drum. You can heat your room with them in the winter, but oh what sound.