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HV noise on video B+?
It kinda looks like there is a periodic pattern to the video noise. Could it be noise on the video B+ from the HV oscillator? Maybe if you could drive the set with RF with no video modulation you could see the noise on the video stages on an oscilloscope and see if it is the same frequency as the HV supply oscillator. You could also try grounding the grid of the first video amp to see if it is in the video stages or before the first video amp.
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