Vacuum Tube Question

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Kanastrous
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Vacuum Tube Question

Post by Kanastrous »

What is the purpose of the silvering applied to the top end of most old vacuum tubes?
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Kuroneko
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Post by Kuroneko »

It's basically an indicator. If the tube is damaged or the vacuum otherwise compromised, that material should oxidize, leaving a visually obvious clue.
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Jawawithagun
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Post by Jawawithagun »

Apparently it's a Getter
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Kanastrous
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Post by Kanastrous »

Ha!

Thanks!
I find myself endlessly fascinated by your career - Stark, in a fit of Nerd-Validation, November 3, 2011
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