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Apparently nonlinear

Posted by Mark Kelly on July 5, 2009 at 15:27:51:
Looks to be a non linear characteristic, approximately a 3/2 power law.

By eye, V = 0.8 + 0.4(I/10)^2/3.

You could calculate the higher order distortion products that this will produce by reflecting the delta V to the grid and taking derivatives. I doubt that it will be serious as the plate resitance is also a power law.