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Please Explain

As far as my knowledge goes, the thermal expansion coefficient of the metal pins in a tube is significantly different than it is for the glass bulb. My mind would suggest that the seal of the glass around the pins is at risk in a cryogenic freezing. Wouldn't the pins contract at a faster rate than the glass? Especially at the temeratures of liquid nitrogen, it would seem that the success rate of working tubes after freezing would be frightening at best. Maybe they don't freeze the expensive tubes because of the losses they would experience at the yeild?
I don't mean to offend by treading where I know not, but I would very much appreciate some explaination on the process.
Finally, do frozen tubes test differently on a tube tester than unfrozens?



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