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Re: [TCML] unknown tube...



It is due to the type of glass in Halogen lamps, the envelopes are quartz and the intense heat and oils will cause premature failure of the lamp due to reaction with the quartz and skin oils causing the lamp to lose its pressure.

Regular radio tubes and light bulbs are "normal" glass and are not affected.
I believe some high power ceramic tubes have the same handling considerations as the Halogen due to oils and the ceramic.

Frank

At 07:27 PM 2/9/2008 -0800, you wrote:
Hello coilers,

I know it is true that one shalt not touch the glass of a halogen bulb or
the vacuum will be compromised by the oils in the skin. Is this true in
general of vacuum tubes?

Jim Mora"

No and I don't think that's the reason for not touching the envelope of those light bulbs. The explanation I've heard is that any fingerprints or the like can carbonize and cause local heating which is injurious. I don't think those things operate under high vacuum conditions anyway. Anyone know?

Ed

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