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One thing that's advisable on HV discharge is to put a 1M in series with the lead to ground and hold it there for about 20 seconds.
Most CRTs will experience dielectric bounce back (they'll recover most of their previous HV) a few seconds to a minute after a dead short discharge...the resistor and patience minimizes bounce back.
I've lost count of the times I've been bit by bounce back, and I've forgotten to discharge and been bit by that too..... It's downright pleasant (the voltage and charge are roughly equivalent to a really good static zap from your houses doorknob in winter) compared to touching a yoke winding or the top cap of a horizontal output in a color set with it running (those will burn a small hole in your skin).
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