How many watts Class A ?
When you make and AB amp there is not much in the class A power range. This is something I plan to cover in the class. The simple answer is once the signal current exceeds the bias you leave class A and go into AB. Nothing wrong with that but a true class A amp needs a lot of dissipation which means a lot of tubes and power consumption. The Jadis JA-200 is a good example that achieves 140 watts with
ten KT-88 output tubes and draws about 500 watts per channel. Each tube in that amp is at max dissipation of 40 watts.
I make a Class A version of the RM-200 that is 40 watts. Although the standard RM-200 is very low distortion, the class a version is lower as it should be. Also remember that with any of my amps going down on the taps lowers the distortion because it expands the class A region as it reduces the signal current by providing a higher impedance load to the tubes. Going from the 8 ohm tap to the 1 ohm tap triples the class a region.