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Might want to check for wandering resistors. I've had a few sets that had vertical problems similar to yours, I've also had some that creep in as the set warms up. Use some freeze spray on suspect resistors and caps after the 90 min. warm-up, watch for a fast change in the picture where your dots are. Good luck with her, you have a great set!
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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