Predicta vertical ghost line

[old_coot88]

Originally Posted by ShartZenith

By adjusting the horizontal dial the line moves both directions almost off the screen. What does this mean?

It means the line is not originating in the H sweep section (ie., horiz osc or output) but somewhere in the video chain (or possibly in the phase detector).
You might try this.. Put a cap of say, .1 mf/600V from the cathode of the CRT to ground, which will kill the video signal. If the line remains, this will tell you it's not originating in the video chain.
(This is assuming video goes in the CRT via the cathode which is standard practice, rather than G1.)