Ajusting focus on a monochrome CRT?

Hi all, I have a 1970's black and white CRT tv and I powered it on and the picture is not very sharp, I barely make out the scanlines, It is still blurry when the brightness is down. I picked up a flat head screwdriver and went to the flyback to find the focus dial/pot and there isnt a single dial/pot on it. No... show more Hi all, I have a 1970's black and white CRT tv and I powered it on and the picture is not very sharp, I barely make out the scanlines, It is still blurry when the brightness is down. I picked up a flat head screwdriver and went to the flyback to find the focus dial/pot and there isnt a single dial/pot on it. No other pot/dials on the board change the focus, Most of them make the flyback squeal and the picture looses H-sync.
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