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Yes, check the focus pin. If this is good, check the focus control and the parts associated with it. If this is good, the focus divider inside the tripler is likely bad (triplers were a common failure in these).
Regarding the chassis number, that one looks more like an E21; but, I'm pretty sure the ones in those hospital sets were E08 and I know they were a 3-board modular chassis, with a delta gun CRT.
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