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Quick update. I reconnected the primary and disconnected the scan coils and can now get a vertical line on the screen. The brightness had to be turned down quite a bit as to not risking a screen burn. Boost voltage is now about 650v.
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Hi Dom,
That's an encouraging result! Presumably, you now have a normal looking glow from the U26 heater? I imagine you will have as the boost volts have come up.
Have you changed the capacitor in series with the scan coils yet? If you have, I can only conclude that the scan coils are faulty. Not an item that usually fails but not impossible.
Having said that, do you know what the boost volts should be?
Cheers
Nick