19ap4 question

[Kevin Kuehn]

Originally Posted by Einar72

The fact it's under vacuum and the cathode is lit is a good thing. My RA-109's drool for it. Ironically, what I have learned from this site is the loss of vacuum in cold surroundings is a possibility. It's 34 and sunny here and all but my "good" 15G (picture on Pete's site) are in unheated storage. Curious as to what others have to say about shipping it during Winter temperaures.

Is it really the cold that's the problem, or is it the transition between hot and cold? I would think it's more of a thermal expansion/contraction issue between the two different materials. I've often wondered the same thing about storing NOS glass tubes in the attic.