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With those 60 year old potentiometers, tin whiskers may have formed causing a short around the terminals of the control or even inside. If you can get access and scrub the outside of the control, if it is tin whiskers, it may fix it. That was the problem with my Admiral 26R12 set. Adjusting the vertical linearity did nothing and the clue (which I missed!) was that adjusting the control made no difference on the voltage.
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