[AMPS] Gassy Tubes and Gas Arcs

Rich Measures measures@vc.net
Mon, 18 May 98 04:40:20 -0800


>>>>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  


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