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I've had luck with both my 466 and 467 hitting the K/G1 remove shorts multiple times and not blowing the tube, I've modified the 466 to use the 467 style plugs and both show the same readings after the remove shorts hits. The 467 keeps the heaters on during the remove shorts so I don't think it's going to kill the tube. If you have a good high voltage power supply and 10uf 450v cap you can basically emulate the removal by heating up the tube and throwing the charged cap across the cathode and grid by hand to bust the short open. I've done this with the little Sony 5" direct heat Trinitron tubes only I used a 1uf cap given their delicacy.
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