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On early Admirals, the contrast control really is a signal strength control, a potentiometer on the front end circuits. I had one that would do the same thing as you turned the contrast down, until you had no signal, only snow. Turning the control up all the way produced overloaded video and blasting sound.
Depending on your video source, you may be viewing copyguard lines on your video, especially if they fade in and out periodically.
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