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Someone just posted the curves for a KT88 on another thread.




These are the curves for a "kinkless" tetrode - a beam tube.

If it didn't have the beam plates, the curves would have a kink, a big ripple, just after the point where they start to flatten out, somewhere around the vertical "100V" line..

This makes the tube rather non linear through a mjor part of it's anode current swing, and hence unsuitable for good audio.

Regards, Allen

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