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Update #4:
Replaced all the tubes with the old ones....got the same white screen, but a bit dimmer and smaller with a black area at the bottom. Wavy, unstable illumination as well. Contact cleaned the tube sockets and service switch too. Replaced the new tubes again and back to stable white screen.
I also remember as the set was failing, when I changed VHF channels, the screen would go completely black for a split second before illuminating the channel. That only happened for about a day before it went totally kaput. No idea if that's a telltale clue...!
Thanks, as always!
Carl
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