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Adam, I bought a NOS rebuilt 7JP4 that arced inside the base (but outside the glass), you could actually see it by looking down through the back of the neck.
I was able to remove the base and repair it, one of the wires got bent over when it was originally installed causing it to arc.
I wouldn't wish the job on my worst enemy though, getting 12 wires back into the pins was a nightmare, terrified the whole time of breaking one off!
Anyway, just wanted to let you know there's hope for it.
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