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I wonder if that lighter vertical bar or lighter left side could be related to a Barkhausen oscillation? It's not the same as the classic view of it, but could it be an oscillation cropping up in the horizontal output? Some cages have a magnet near that tube, or sometimes an ion trap is strapped to the tube, moved around to see if it makes a difference? Or trying different tubes.
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Reece
Perfection is hard to reach with a screwdriver.
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