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Be warned that the flyback transformers are high failure parts in these sets. They'll either short and take the HOT with it, will arc out the side, or literally blow their guts out the side of the transformer.
A weak CRT can cause poor focus; but, I'd adjust the focus pot on the inside of the set. If the best focus is obtained at the end of the control range and if this focus still isn't right, the trouble is likely either a bad flyback (internal focus divider inside the flyback) or faulty CRT socket. I've also seen a good many weak CRT's in these; so, I wouldn't at all be surprised if yours is weak.
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