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Generally speaking, this is caused by the video or kine b+ being modulated at the horiz rate. Any secondary voltage supply sourced from the horizontal output or HV transformer will cause this if the bypass filter is failing. Usually, you can find an electrolytic cap in the sweep area. If you have a scope, set the timebase to the horiz frequency and check the caps for noise. If this monitor uses a smps type low voltage power supply, a bad cap there can cause this as well.
If you have an esr meter, look for a bad electrolytic.
John
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