> Resonance center and pure resistive impedence are not always the same thi=
ng,
> although usually close. =A0The resonance peak is usually the easiest thin=
g to
> measure. =A0For quick and dirty tuning it's probably enough.

It is likely to be of very limited use in this application :-) - but I
found long ago that best tuning on a dual '807 Class C final was
achieved by maximising the blue glow which appeared on portions of the
glass outside holes in the anode structure - caused by electrons
hitting the glass, and not the blue inter electrode glow which is
caused by gas. I had wondered if it was Cerenkov radiation, but
Gargoyle reveals a number of people who say it fades with age of tube,
suggesting some form of fluoresecence.
Best results were very slightly off resonance.

When your transistors start emitting Cerenkov radiation it's probably
past time to leave the building.



              Russell

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