Richard Harrison wrote:
Jim Lux wrote:
"in a linear system"

It produces no significant harmonics, so the system is linear.

I'm not trying to be difficult, but I just resurrected the
Fourier equation for the output of a class-B amplifier. It is:

i = 0.318Im + 0.500Im*sin(A) - 0.212Im*cos(2A) - 0.0424Im*cos(4A) - ...

The second harmonic is 42% of the amplitude of the
fundamental frequency at the plate of the tube amp.
--
73, Cecil http://www.w5dxp.com