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I don't think discharging the anode to the chassis will magnetize anything, but any steel components like the chassis and brackets can pick up stray magnetism on their own.
With color CRTs, the brackets that hold the tube down are just as culpable for purity errors as the shadow mask is.
I've never degaussed a B&W TV but I would in your case given your symptoms.
You can make a degausser or buy one, but I don't think a small magnetic tape degausser or electric motor tool can reliably and cleanly demagnetize a large area.
John
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