TIL the shiny metal coating on top of vacuum tubes is not an X-ray shield, but a... | Hacker News

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		Luc 5 days ago \| parent \| context \| favorite \| on: A Vacuum Diode for Make: Magazine TIL the shiny metal coating on top of vacuum tubes is not an X-ray shield, but a reactive coating to scavenge any remaining molecules out of the vacuum.
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Cyan488 5 days ago [–]

You'll find a similar thing in vacuum fluorescent displays as well [0].

[0]: https://ibb.co/XZHWLD3x

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