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The arcing sound is in the vicinity of the anode connectors, not in the neck and the sound, although hard to describe is distinctly inside the tube. There is no blue glow at all and no signs of gas. Emission of all guns is at 100%. The CRT and metal shield are well grounded throughout. All copper strips are clean and tight. The arc was audible but muffled until the metal CRT cover is removed and then becomes quite audible but not visible.
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