Quote:
Originally Posted by ppppenguin
A problem that's affecting a few earlier camera tubes is helium ingress. The glass is permeable to helium and despite the low concentration in the air, there's a density gradient across the glass.
The beam travels a long distance at low velocity so even a farily small amount of gas will cause trouble.
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Yep. That's supposed to be reduced by occasionally firing them up. I don't think I knew it's specifically helium, but that makes sense.