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It doesn't look to me like your CRT has any aquadag coating on it - not all do. I bet there's a high voltage capacitor next the the rectifier tube that does the filtering.
The arcing could be caused by component leads or wires coming too close to the base. I recently worked on a Motoorla that had bad arcing caused my a wire coming too close to the rectifier. All I had to do was move it out of the way.
Did you do any work around that area ?
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