Your purity is off. RCA jugs used a glued on yoke & usually a strip
of magnetic tape on the neck so things are not done as usual.
1) be sure nothing magnetic is near the set such as a speaker.
2) the degauss may have stopped working. Usually its just a thermister that
fell apart. Most of time you can solder back together.
3) They use correction magnets that are glued to the CRT bell.
One may have fallen off. They are brown & chevron shapped.
Post the chassis number also ( CTC###- ) and maybe a chassis pix
to help us point things out.
BTW DO NOT mess with that magnetic tape on the neck of the CRT !
It will not help you.
73 Zeno
LFOD !