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Hey Dave, I don't think that is the case. The load seen by each triode certainly does vary a bit. In the RDH3 an equation is offered which relates this change to plate resistance(for Triodes ). I am not sure I buy the whole thing. The plate z does change across a swing, and varies by a factor of ~2.5

it appears to be completely alien that the multi-grid valves would be operated at anything else but max power conditions. Plae z certainly varies a bit with pentodes from g1=0 to near-cut off at te other end. I have not seen many data sheets with PP class A pentode op points thoroughly docuymented very often.

The a-a/2 looks like a place to start correcting in order to arrive at a more comprehensive explanation. From first principles, like conservation of energy, it looks to be a reasonable place to start.
regards,
Douglas
!


mmmmmhhhh...Forbidden Donut!!!


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