> Just curious -- does this mean that for a given tube /
> power level, there is a Sweet Spot where efficiency is
> optimal? Or, was I seeing the effects of a tank circuit
> not being loaded at the design 'Q'?
>
> I always assumed more was better with respect to Plate
> Voltage (at least to a point). But now -- I don't know...
Did you retune the tank?
Tank loaded Q has little to do with efficiency unless it
falls totally off the perch, or unless the tank has very
high loss.
My bet is you have a tuning or metering error. The only
other case is if something in the resonant system has
terrible loss.
73 Tom
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