More like class A was first... All those old cheap 9 transistor radios were class A.Class A must be better than Class B. Class C, D and F are definitely out, maybe Class AB is acceptable for the working classes.
Ugh.
https://peavey.com/class-act/
Here is an old article I wrote for Peavey last century. I will apologize in advance for all those (old) Peavey amp SKUs but it was a marketing/promotional article after all.
JR