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the jumping when scene changes occur could be agc is too high ?
as a test you could put a brightener on it and if you get less retrace lines then you will know it is the crt , those don't remind me of retrace lines from a broadcast but more of the type you see with a weak crt , so add a brightener , if you get enough brighteness when turning the control for less retrace then you will have the answer.
mike
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