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Resistor values in the vertical output / driver stages are very critical. there are two resistors (r64 & r65) which are supposed to be 4.7 meg. from what i can see on the picture, they appear to be different values. they also appear to be not the originals. check those first as they will be the ones that will have a drastic effect on the linearity. they both have got to be the exact same values.
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