"Sorry if this is a silly question, but, which is the criteria for sizing
(mainly its diameter) glass tubes envelope?. One can see a glass envelope in
an 813 tube relatively near the plate electrode, but for 3-500z or RS-1019
tubes, those are fat indeed. TIA"
I am speculating, but - tubes that run red or white have more spacing
between the plates and the glass. 304TL, 75T and 3-500Z tubes run at a
higher temperature and the plates need to be further away from the glass.
Now, the next question is - if a one vacuum tube has more volume inside than
another, does it have more or less vacuum?
Colin K7FM
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