this post was submitted on 20 Mar 2024
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Mildly Interesting
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How much pressure? Is the bulb pressurized or the smaller tube? Is it normal air or something specific like nitrogen?
I searched it up:
It seems the smaller tube is pressurised, the larger bulb is under a vacuum. Some of the other diagrams also show a getter in the bulb, so it's a proper vacuum tube level vacuum.