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I recommend clipping the CRT anode button to ground, after discharging with a jumpered screwdriver and removing the HV wire from the tube. Or inserting a high value resistor in series with the jumpered screwdriver. Otherwise the CRT anode can 'recover' it's charge and bite you again in a few moments after it has been discharged.
I learned this the hard way on a Silvertone with a 21GUP22 CRT several years ago.
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