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Originally Posted by DavGoodlin
This explains pretty well what some texts referred to as a "gassy" CRT or one not under full vacuum..
so maybe gassy is incorrect  , otherwise you may see some violet glow in, but not so much around, the electron gun. |
All the cases of extreme weak emission i've ever seen did not exhibit signs of vacuum loss or purple glow. Weak emission and 'gassy' are quite different critters.
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Is this the same reason for the color smear (when increasing brightness/screen/bias) when a corresponding gun is weak in a color CRT?
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You'll see this sometimes in a solid state set with a weak gun when someone, trying to compensate, has cranked up the driver transistor for that gun. That can cause the transistor to saturate on peaks, resulting in the trailing smear. I don't recall ever seeing it on a tube type set.