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Lytics typically were +100%/-50% tolerance on the capacitance so 75uF would be the lowest you can go on a 150uF. Papers typically have a 10% tolerance. Most sets don't mind some variance in the capacitance of lytics, but papers can be more critical especially in any stage of a TV other than audio or power. In some cases (usually paper caps) if I don't feel I can get a precise enough value for the circuit I'll put two capacitors in parallel to get the value I need (capacitances in parallel add).
The closer the better but 120 should be plenty close to 150...If you get excessive hum on the line it filters after the recap you can always tack a 33 or more on in parallel with the 120 after the fact.
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