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On a couple of sets I worked on the horizontal would go out of sync after working fine for awhile. In both instances it turned out being mica caps that became leaky. In one set it was the cap coupling the sync separator to the hor. phase detector. This put a high voltage on the phase detector (something like 110V when it should have been a couple of volts). In the other case it was a capacitor in the horizontal oscillator circuit. Start checking your voltages in the horizontal section.
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Sean - WØKPX
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