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Monochrome CRT characters are not stable and rather shaking or waviness in them, sometime feel like moving forward and backward. Issue is in the high voltage power supply but what could it be, do high anode ripple can play part in this?

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    Are you sure that it's the CRT and not the video output?
    – jwh20
    Oct 25, 2022 at 12:48
  • 2
    What type of computer/video card? What model CRT?
    – manassehkatz-Moving 2 Codidact
    Oct 25, 2022 at 14:43
  • Is there anything nearby that might be generating a strong, shifting magnetic field?
    – HABO
    Oct 26, 2022 at 3:06
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    Anode voltage ripple would cause varying picture size, both horizontally and vertically. If you just observe horizontal ripple, check the "horizontal position" potentiometer and the hsync pin for bad contact.
    – Michael Karcher
    Oct 26, 2022 at 5:43
  • How old is the CRT? Electronic parts tend to degrade over time, especially capacitors.
    – the busybee
    Oct 26, 2022 at 6:18

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