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If there is a slight red cast flagging off sharply contrasted outlines, it is likely a weak CRT. A sanyo of that vintage likely has a screen and focus control on the side of the flyback, try adjusting the screen control a little and take note of the picture.....if turning the screen control down improves it and turning it up makes it worse, then you probably have a weak CRT.
Turning the brightness and contrast down may make it watchable.
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