Quote:
Originally Posted by bandersen
Getter is completely used up in the dim 7JP4. I think a trace amount of air inside would account for the damaged phosphor and dim image while it seemingly has good emissions.
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The air/gas will also increase the conductivity over that of a perfect vacuum increasing emission current and giving a falsely good emission reading....
I've never seen a gassy CRT that had emission and read as having weak emission... they are either stone dead or brand new, emission reading wise from the neon bulb effect.