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I'm not sure I'm familiar with the Crosley you're working on. The one I restored that I got out of a barn back in the mid '70s when I was fresh out of high school was a monster with barn doors over the 17 inch screen, and had 4 pix IFs. If yours has at least 3 of those, and it has a keyed AGC, I'd start looking for any resistors that have drifted out of tolerance (those in the set are very likely carbon constipation types that--despite this perhaps unfairly applied name--are apt to be of rather loose tolerance....) such is a good start--assuming, of course, that you have made sure that your power supply voltages are where they should be.
Also when dealing with sync instability in some of these old dinosaurs you need to remember to check that the outer auquadag skin on the back bell of the CRT is properly grounded. A stray pulse otherwise can rain on circuitry down below and wreak havoc on the delicate signals they work with....
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