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Possible heater to cathode leakage or short? A heater to cathode short will cause the brightness control to have little to no effect but usually in such a case the picture will be washed out or have retrace lines that cannot be removed. I wish someone could manufacture a replacement CRT for these sets. It is essentially a scope tube so it shouldn't be that difficult or costly.
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Just look at those channels whiz on by. - Fred Sanford
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