Quote:
Originally Posted by etype2
It looks like a hole opening up. If I could get a macro on it, we’d see more. I will keep my eyes on it to see if it changes in appearance.
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A hole opening up in what?
Unless that is the point the beams light up for a moment after power down it should never change*.
*Unless there is some abrasive debris between the phosphor and shadow mask and you set the tube face down and shake it.