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OK Dudes,
I think I'm onto it: everything (cold) checked out A-OK on my ohmmeter, so I powered it up with my test pattern fed into the set: came up pretty damned nice linearity and within about 8-10 minutes it was squashing out. So on a hunch, I went after R97 and R98 which feed to the input side of the vertical amplifier (7F7 tube) which affect grid 1 and cathode 1 respectively and sprayed both with freeze. Within 5 or 6 seconds the vertical linearity returned to normal and within a few minutes or heating back up again it began to gradually squash down again. My guts telling me it is the 2.2 meg resistor feeding grid 1.... but they are both kinda buried deep in a tough spot, so if I'm going in, I'm gettin' them both.
Will swap them out tomorrow sometime and report back, but i'm feeling fairly confident here......... Stay tuned!
-George-
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