[AMPS] Gassy Tubes and Gas Arcs

[Vic Rosenthal]

Jon Ogden wrote:
> 

> 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?

Did you ever see a VR150, 0B2, etc. gas regulator tube?  Or even a neon bulb?  You
can see the gas glowing inside the tube.  It looks quite different from the
fluorescence on the glass envelope of a tube.

Vic, K2VCO

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