Biggest problems with pentodes overall is the nonlinearity. .
I'm not a fan of using them in AF circuitry. A dual triode typically
gives you as much open loop amplification using 2 stages, with
significantly lower distortion.
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Are your conclusions based on hearsay or did you make some measurements to back up your opinion? If you have some comparison data perhaps you could post it here.
Thanx, John
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