[Amps] Glass envelope

[GGLL]

Ian White GM3SEK escribió:
> GGLL wrote:
> 
>>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.
>>
> 
> 
> Nothing?
> 
> Tubes are typically pumped down to about 1E-8mmHg, which means that the 
> "vacuum" space of an amateur-sized transmitting tube will contain well 
> over a million free gas molecules.

	Well, I ignored that and simplified things also; then, after "vacuum 
process",  and to "kill" those over a million molecules tube's manufacturer 
use the getter method?.

Best regards
Guillermo - LU8EYW.

> 
>