Looks like you only have 20 Volts of grid change on that earlier plot. Here's the rest of the curves:
Plotting most any load line on them shows a 2 to 1 change in gain from one end to the other. Umm... 100 % distortion? Probably work OK in P-P though, where all that 2nd Harmonic would cancel.
edit: added curve trace of a low distortion triode for comparison (not a 300B, this only costs $3)
Plotting most any load line on them shows a 2 to 1 change in gain from one end to the other. Umm... 100 % distortion? Probably work OK in P-P though, where all that 2nd Harmonic would cancel.
edit: added curve trace of a low distortion triode for comparison (not a 300B, this only costs $3)
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OH, sorry. I think a 2 to 1 gain change is more like 20-25% distortion in class A.
That's at max amplitude of course. The dominant 2nd H distortion varies quadratically with amplitude below that. Would have to hit the books and a load line on the curves to calculate it the precise way from tangents/chords and all that.
2nd harmonic would cancel out in P-P anyway.
That's at max amplitude of course. The dominant 2nd H distortion varies quadratically with amplitude below that. Would have to hit the books and a load line on the curves to calculate it the precise way from tangents/chords and all that.
2nd harmonic would cancel out in P-P anyway.
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