Quote:
Originally Posted by dtvmcdonald
But since its triode connected, why did they not use a triode?
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In the late '40's there was no medium power triode. There was no need for one. Connecting a penthode as a triode lowered the plate impedance and it suited admirably.
Are you able to do a transconductance test on the 6K6? Or at least an emission test? I suspect the tube is bad.
And it would be nice if you could post the improved linearity.