[Amps] Glass envelope

k7fm k7fm at teleport.com
Tue Feb 7 22:24:02 EST 2006


"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 



More information about the Amps mailing list