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Thank you ctc17 for the video, the 10FP4 tube with the purlpe was not as bad as that one. There was a very faint purple glow, you have to really concentrate to even see it, I have not come across it in the other tubes I have tested, could be because the HV is not hooked up. the faint glow is not in between the plates ether, that would be bad.
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