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The distant variable air capacitor does seem problematic. It is connected by a grounded cable from behind the tint dial on the front of the TV. So that grounded cable is itself a capacitor between the cable and the grounding around it. I bet the total capacitance of the grounded cable is a sizable amount of the capacitance of the variable air capacitor.
I will redo chroma AFC alignment, oscope the range of phase shift of the oscillator and then hopefully that sheds light on why tint control lacks range.
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