| >>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?
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  
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