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Does the focus get good when you turn the brightness and contrast way down? If so, you either have poor high voltage (or poor B+ causing poor high voltage), or a weak CRT. It's very rare to see a focus problem on electrostatic focus black & white sets.
If it does focus nicely at low brightness, measure the high voltage and see if it drops off a lot at max brightness. A few hundred volts down is probably OK. Also, the picture will bloom or grow in size, as it dims, if the high voltage is falling off. If the high voltage is OK and the picture stays the same size, then unfortunately, you will need to suspect the CRT.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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