Pandicon tube help please

[Jasper nagle]

hello i just received my brand new pandicon zm1200 tube and noticed near a pin it has a crack in the class it does seem to work still but has me worried should i put a drop of glue im not sure never had this issue?

[Dekatron42]

Have you asked the seller for a possible full or partial refund?

There are some special epoxy glues used for vacuum gluing glass which I was trying to get hold of a few years but they were very expensive, I think this was one of the threads I wound up at: https://www.researchgate.net/post/Which_epoxy_or_glue_is_best_for_high_vacuum_and_temperatures_above_80_degrees

Here's a link to Thorlabs: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=2519, UHV had some good glues too but I ended up with getting hold of a sample from Thorlabs.

/Martin

[Jasper nagle]

thanks im not wanting a refund at all because these are things that happen. It still works just fine and looks like it would even be fine to just leave. Its brand new so i think it's just time has done its magic finding a tube in this condition is pre rare so ill try the glue you said was made for this sor of thing

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