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Well this morning I had a bit of time to start looking things over, and I did find that someone had eliminated resistor R96 (150K) which runs from the height control to ground with a wire - in other words going from the pot straight to ground. Replacing that resistor improved things slightly, however there's more work to do. I'm noting that when the set first comes on cold linearity is fairly decent but gets worse over some minutes as components warm up.
So firstly I'm going to go thru every resistor in the vertical section and replace anything more than 10% off. If that doesn't cure it, next I'll leet it warm up and go shoot each resistor with freeze spray to see if I can nail down any offenders and see where it goes from there...............
-George-
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