>>>>There are two kinds of blue glow with 8166/4-1000A tubes: Where the
>>>>electron beam strikes the glass envelope, and in the evacuated space.
>>>>The first case being normal and the second case being abnormal.
>>>
>>>In the evacuated space??? Isn't the whole tube evacuated??
>>
>>With luck.
>>
>>> Please explain...
>>
>> If one sees ionized gas, is the inside evacuated?
>
>So then if all of the tube isn't evacuated, none of it is evacuated.
>
The evacuated space acts as one entity. The space is pretty well
evacuated and sealed at manufacture. If a glass to metal seal has a
microscopic imperfection, the vacuum fades as air invades.
>But you said that one blue glow is from electron beams striking the
>envelope. The other is in the "evacuated space." How do I know which
>from which?
>
By observation.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|