Thanks for your compliments. Truly encouraging.

Hopefully one day soon I could progress as far as you and littleghost are.

p.s. littleghost even helped me punch holes through the case.

http://tangentsoft.net/audio/

Bible for beginners like me.

Depend on you take which "class A" amplifier as reference.

Here some link for you to understand more about class A amplifier:

you're getting the wrong impression about Class operation.

Class A, Class B, Class AB etc are output stage operation classes. They are configured to operate at "different" classes. It's a configuration rather than an individual amplifier by itself.

The CMOY is a whole block of working amplifier. Its output stage might work in either classes.
CMOY is a single chip opamp so depending on which chips you use, it operates at a prefixed "class", which varies differently from one chip to another. Most opamps due size, is limited to Class AB. Class A forces the output stage to run at max operating current all the time so it's going to be hot.