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I'm not entirely versed in Sylvania as it was not one of our house brands. But one of the resident gurus on here should know off the top of his head whether your set uses a horiz. AFC diode ('phasing diode') or not.
If it does, it's the very first thing to replace (after checking the horiz. oscillator tube).
It'll be located near that tube, and is a small rectangular block with three leads. You should be able to spot it easily if the set uses one.
Last edited by old_coot88; 05-06-2015 at 05:07 PM.
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