@clearthinker the krell ibias amps do not run in class B, they are class A the circuit used increases the class A bias as more class A power is needed. Krell's old sustained plateau bias was also class A, in fact if you drive those old amps hard they will generate enough heat that the top two bias positions will drop down to class B until the temperature of the amp comes down.
CLASS A POWER RATINGS
In well designed SS class A power amps I was told that although power could increase to double in class AB mode from speaker demands of 8 ohms to 4 ohms, class A suffered to be cut in half.
For example a class A denominated amp rated at 50 watts class A into 8 ohms would double to 100 watts class AB into a 4 ohm load but only have 25 watts of class A power before switching to class AB.
But I've noticed of late claims of manufacturers stating their amps double their class A power as impedance demands are halved.
So is the explanation that technology has advanced ?