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Heading out to the hardware store now. I'll be posting a video soon where I experiment.
I just discovered that pushing on one of the filter cap bases has a minor effect on the distortion.
If I lift the CRT up off the chassis, the vertical distortion diminishes and disappear altogether at about 12 inches. The horizontal distortion is always present.
The two 500pF caps are ceramic doorknobs and I did not replace them. I did replace the 12SN7 inside the box and retuned the trimmer cap. Seems to be working OK now.
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