Okay, the set's operational
Turns out that the resistor WAS too close to the chassis, and it arced over. Had to end up putting a vertical blocking transformer in it as well, but everything seems fine now....except for a couple things.
The set's got inadequate width, but only by about 3/8" on either side, so I'm not so worried about that right this second. What DOES worry me is that the resistor network in the back cover is getting hot. I mean HOT. As in, I was watching the set, and I *believe* the solder on one of the resistors just melted off and POP.....the resistor dropped from the wire and I lost picture.
The contrast/AGC control also barely does anything to the picture, which is somewhat on the weak side. My other 8TS30 has full range in that department.
I don't remember any of the other 630 chassis sets I've done run so bloody hot....but then again I can't remember how much heat's back there because I've never had an issue like this.....