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The line is there because the vertical deflection unit - the one that spreads that line across the entire screen to form the image - has failed. Replacing it is a job for a professional, or at least an experienced amateur, and the parts will be quite difficult to find for such an old tv .
The problem is sometimes caused by the vertical output integrated circuit (IC) failing, but usually it's bad solder connections. If you or someone you know is comfortable with electronic soldering, a few minutes spent resoldering the IC pins to the circuit board will often solve the problem. Failure of these connections is common because the IC gets quite hot (and it's mounted on a metal heat sink). The heating and cooling cycles cause the solder joints on the circuit board to crack. You can usually see the trouble with light and a magnifying glass; gray grainy joints instead of shiny connections, and often visible ring cracks around the pins.
Sounds like a failed vertical amplifier circuit. This is normally primarily contained in an integrated circuit mounted on a heatsink.
There are other possibilities along the line but the one above is the most likely.
Now all you need is a TV repair shop that is still in buisness.
This is what is known as frame collapse - which means there is no vertical deflection applied to the tube.
Please do not continue to watch the set in this condition as it may burn a horizontal line in the middle of the screen.
The most likely cause is either bad solder connections to or failure of the frame vertical output IC.
Please rate the assistance I have given - I hope it is useful. If you call a serviceman and tell him its frame collapse as this type of repair is not for amateurs - voltages in television receivers can kill.