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7. With all connections restored, on switch on, the line whistle comes up, the boost voltage starts to rise to beyond 300v and the line whistle is loud, the line whistle then goes quieter but still audible and the boost voltage falls back to about 230V, no light on the screen and the PL81 start to red plate.
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Hi Dom,
Glad to see you are having another battle with this thing!
I wonder if the above statement occurs as the U26 starts to conduct? Have you tried running it with the top cap of the U26 disconnected and monitored the boost? Does it still die?
This is certainly proving to be a tough one to solve.
Cheers
Nick