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My TV Consultant 1955 Edition lists this as a "Barkhausen" oscillation. The cause is listed as "interference due to oscillations set up in the horizontal output tube and picked up by the tuner".
Possible fixes are interesting. One is listed as of course swapping tubes but the instuctions go on to say to try a specially designed anti-Barkhausen tube made by several tube manufacturers. I've never heard of these tubes. Also it says to reduce horizontal drive and check linearity adjustment.
Heres another neat idea. Probably the most interesting. Fasten a magnet such as an ion trap to the horizontal output tube and move it around until the line goes away.
Maybe my old book will help you! I hope so. The only other possibility I saw was yoke ringing which someone else mentioned.
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