[Amps] Ep Sweet Spot

[Tom W8JI]

> 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