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While working on a CTC-11 RCA color set I disconnected the plate cap from the 3A3, then wrapped two layers of black tape around it, being careful to not pull on the cap or the flyback connections. The sweep sections and the neck components remained in-circuit with the power supply only "up" by a few volts due to the CRT not drawing HV current. Did what I had to do, carefully removed the tape, and hooked it up again, and all was OK. Might not be the best method for all. I DO like the HV lead in plastic or glass, too.
All the best!!!
Kevin
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