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Most focus coils can not only be moved back and fourth, but also tilted to keep good focus and eliminate corner shadows.
If the Retrace lines consist of dashes come and go in the top to the screen and they don't run the full distance from side to side that it is porbably the copy protection signal from the tape or DVD that you are seeing. You can buy devices that will remove the offending copy protect signal if you want.
I'm not familiar with early admirals, but can offer that some vintage sets of some brands pick off the audio signal after the contrast control and may have their sound affected by it.
Hope this helps.
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