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I have this G05-801 whose image will vary in brightness all by itself. The issue is contained to the deflection board. I swapped in a known good deflection board to confirm and the image is stable. The image is good at startup and will slowly get brighter, then have bursts of dimness, then almost no image until you turn up the pots. I found a bad diode in the X section, but that is unrelated. I've replaced both the brightness and contrast pots as well as Q504 in the Z section. Gone through every resistor, diode and capacitor and all are within spec. Thinking this may be coming down to the neon lamps. It's hard to capture on video, but I'll try to again later. Anyone care to give a guess?

EDIT - After reading a few more threads, the neon bulbs are likely not the cause of my problems…
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