Always good to get the dust out.
If it has arced before, it may have developed a carbon track someplace that keeps it arcing. Investigate the crunchy looking wire for sure.
It may be arcing in more than one place.
Arcing somewhere on the CRT could be a bad / dirty ground contact, which may be the purpose of that spring.
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Old TV literature, New York World's Fair, and other miscellany
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