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Does that set have a CRT Bias switch or pot? Make sure its at minimum. (dimmest picture)
Follow the grey scale setup instructions in the sams exactly. If the bias, screens and drives are not set up right you will get the bouncing you speak of.
Try the HV adjustment at minimum brightness, does it do anything?
Horizontal blanking issues can cause the crt to 'overload' the high voltage below the threshold of the regulator kicking in. The Bias effects the blanking on that chassis.
I have a ctc11 on the bench and the HV is rock solid.
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