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This is exactly how one of mine failed.
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Same here, the set was working perfectly with an excellent picture, it then just faded away after running for 1.5 hours
I have had 3 LOPT failures over the years, all due to shorted primary windings.
I am sure it is due to the paper in the primary going conductive, as this has happened to a LOPT that had been dried out on a bench PSU for several days.
I am pretty certain that previous storage conditions can cause this issue, my first TV22 was stored in a warm bedroom for decades, and has had no issues since I restored it around 10 years ago.
Mark