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Sometimes the maker offered the same basic chassis in a variety of cabinets with several different screen/CRT sizes...You would be surprised the extent to which different monochrome CRTs of the ~first decade after WWII were electrically compatible with each other.
What matters is that the signal tube compliment and layout jibes with the schematic...That will be the best way to tell if the literature is applicable to your set.
A word of note sam's is known to have had typos (I know first hand) and not always had complete or sometimes any documentation of production changes so always watch for differences between chassis wiring and schematic, and when in doubt (provided a previous tech has not hacked up an area) always err towards the way it was rather than the way the literature says.
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