i am seeing a corona discharge around both tubes in an amp - the blue
glow is visible if you look down through the cooling fins - the tubes
are 3cx800's. any ideas on what would cause this? the corona is
visible at about 10w drive and increases in intensity to 50w. it occurs
on both tubes and the two replacement tubes.
it looks exactly like a gas burner on the stove, a blue glowing "flame"
dancing around at the base of the tubes.
the amp is a Commander HF-2500
-Steve, WM3O
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