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I would isolate the anode cap (discharge it first, then carefully remove it from the CRT) in a plastic container above and away from anything (to prevent arcing). Leave the HV probe connected and the regulator tube connected. Watch the HV probe to see if you still have high voltage after the time it would take to fail. I had a 26KC20 a long time ago that developed CRT leakage and would do this trick after it warmed up and had a bright scene. I replaced the CRT after doing this test and it remedied the problem. It's the only time I ever saw that happen. I always wondered what happened in the CRT to cause that.
Hope my experience was very isolated but you are beginning to describe it......
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