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I had a problem with an Admiral 26R12 that had a vertical linearity problem. Rotating the control didn't change the voltage (a clue that I missed!!!!!). Eventually, there was a pop and collapsed vertical sweep. Eventually, I found the problem to be simply tin whiskers on the control. A good scrubbing with the toothbrush was the quick, and inexpensive fix. Now, I am on the lookout for that issue.
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