Is it?
The low distortion near the zero crossing point (around the average of the signal).
Gradual controlled distortion at high level signals.
Both requirements are achieved by analog discrete electron tube or transistor circuits in class A (electrons flowing all the time) or signal transformers,
Reference:
Tube vs transistors, is there an audible deference - Russel O. Hamm - JAES
Applied Electronics - T.S. Gray - MIT
(General amazing reference)
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