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Thanks, I cleaned up with rubbing alcohol and a toothbrush and didn't see any obvious traces, although the insides were covered with a uniform black dust, like everything else inside the h-v cage had been. Maybe the lazy-man solution would be to put it back together and see if that helped at all :-)
Yes, there's an ion trap, but adjusting that for best brightness, I still got the odd up-and-down response from the brightness control.
I attached photos with a snip from the schematic and a view of the 1B3GT socket. Resistor R235 (1 meg) tests normal on an ohmmeter, but note how it's assembled with its body resting against the terminal to which R233 (3.3 ohms) is connected. Maybe that was the arcing spot . . . ?
Which brings up my real question. In this photo, the upward end of R235 connects to one of those beautifully rounded-off solder joints. With things as they are -- i.e., hanging sideways with no way to turn the table any farther -- I doubt I could replicate that joint.
In other spots, I'd be content to snip the old resistor lead to the big rounded joint and do a J-hook connection to the new resistor. Just wondering if that's asking for trouble here, since lead dress looks important.
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