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Are there 4 wires to the ON/OFF switch? If so, you cut in a standby supply to the CRT when the main is cut off. Sony and Toshiba, along with most of the Korean sets did that in the 70s-80s, and many others did too. That's my guess, and a quick look at the schematic would tell all.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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