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With all of the posts, I still say it's caused by a bad delay line. Most likely it has a turn of wire inside the delay line that is shorted causing the ringing. You can do a real simple check. The delay line as you probably know is a long hollow cardboard tube soldered on the back side of the chassis, kind of towards the upper middle. It has 3 leads on it. One of them goes to ground. The other 2 is the video signal in and out. Back out the chassis far enough to keep it connected, and throw a clip lead across the input and output leads (wires) on the delay line. No need to disconnect them. The leads will be on opposite ends. Don't worry about disconnecting anything. Leave the ground wire alone. I can almost bet that the ghosting (ringing) problem will be gone, but you will notice the color will be displaced from the Y (black and white) signal. Attached is a picture of the underside of a CTC9. The long yellow tube (stick) is the delay line.
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