Parasitic Oscillations can occur anywhere, any time, especially when
the plate voltage rises to significant levels and then the insanity
and illogical occurrences increase with frequent displays of
fireworks. There are those that enjoy the arcing and loud bangs and
then there are those that dawn their sunglasses and ear protectors and
care not to see or hear the evidence of instability before us.
Some of us just give up solving the wild and insane perturbation and
merely back off on the C and put in lotsa L gingerly adding very very
small amounts of C then remembering that precise position where
stability prevails. I think we all know how to find that spot.
Regards
Geo - W7LFD
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