Quote:
Originally Posted by holmesuser01
...Just before the high voltage comes up, the neck of the CRT lights up a dull dim blue in a 2-3 inch wide area. Then, as the HV rises, and the CRT begins to charge up, it goes away, and the image comes up on the screen, as good as ever.
Bruce
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I have noticed that most of my 7591 output tubes have quite a blue glow when they first start up. But after the B+ gets up to snuff and the tube starts to warm up, the blue is much less visible. So, sounds as though it may be normal.