k7fm escribió:
> "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?
Does it still has nothing?. So it must be equal regardless inside volume.
Best regards
Guillermo - LU8EYW.
>
> Colin K7FM
>
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