tube 'blackening'

Oct 07, 2005 2 Replies
R
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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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A

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

Al

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R

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.

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