Thread: Gec bt1091.
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Old 17th Mar 2018, 12:29 am   #20
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Join Date: Dec 2014
Location: West Midlands, UK.
Posts: 214
Default Re: Gec bt1091.

Originally Posted by Boater Sam View Post
does not helium infiltration destroy them at least in part?
I will watch with interest.
Don't think the concentration of helium in the atmosphere would make that a significant factor. Any such would have to have been produced by radioactive decay. Any produced would head up fast in any case. Different story if the CRT was put in a closed vessel with helium gas in it.

Which reminds me of a Sci Fi story I read when I was young, about a space ship (which used thermionic valves) that landed on a planet with an atmosphere with a lot of helium in it. The helium diffused into the valves and poisoned them all, including all the spare ones of course, so the space ship was stranded....
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