Phil and Old_coot88, thanks for the info! The socket looks to be a substantial one, made out of ceramic, and there is no scorching around the terminal lugs at the bottom. It looks like the lack of that fish paper at the top of the 1B3GT might have caused the arcing in mine. I've just repaired the curling veneer on the top where someone must have doused it with water when it was sparking. I'm definitely itching to get to the electronics, and will as soon as I finish with a Hammarlund 129x I'm struggling to align (the IF curves look as they should but the sensitivity is poor).
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