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Are you saying it's arcing in the base of the tube or under the chassis at the capacitors?
I had a brand new 7JP4 that had one of the wires in the base bent over when the bakelite base was installed, that is probably why it was never used.
It behaved very much like yours but I could see the arcing through the glass.
In that case I was able to remove the base and fix the problem, it was a nerve wracking job however trying to get all 12 wires back in without breaking any.
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