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tube 'blackening'

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I have noticed a major tube 'blackening' of a number of fittings using 28W

2D tubes with 'unbranded' HF ballasts. The current crest factor is high - but what is the mechanism of the blackening causedby this?

Regards

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Reply to
R.Lewis
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Possibly if the starter fails and the filaments glow all the time, the tungsten will evaporate and coat the glass.

Al

Reply to
Al

Even CFLs have this problem. One end is always closer to ground, and that appears to make the current thru the tube non-symmetrical, so one end gets more "zapped" than the other end, and the effect feeds on itself.

Reply to
Robert Baer

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