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If the horizontal is still running fine, and the HV isn't being loaded down, I wonder if that 1.5K @1-watt resistor (R106?; can't quite read the middle digit) is going up in value as it heats up? It's the only thing I see that could do that; assuming that it's NOT a load-down problem and that the horizontal oscillator and output are running, and that you've swapped out the rectifier.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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