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That is the "green halo" problem that is common on CRT's (especially Zenith's) of this era. Depending on how bad it is; it may not be as noticeable when the set is on. It can be removed. See the thread concerning cataract removal on the early color TV forum. My '68 Magnavox has this same green halo on it's currently installed '72 Zenith Chromacolor tube. I'll probably leave it alone unless it shows up really bad when I fix the set.
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