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I'm running, and working on, a CTC-7 with an original CYP22 in it.
When it's warming up, I get a momentary glow of blue in the neck of the CRT just as high voltage comes up. It's always gone before the screen lights.
The 3A3, which is an original with the set glows blue for just a moment around the gap between the plate and cathode.
This set is almost totally original... a total of 2 tubes replaced by me.
Perfectly normal for me over the years.
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Bruce
Last edited by holmesuser01; 01-05-2016 at 10:18 PM.
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