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Hmmm. AGC set a tad too hot? Possibly a bad electrolytic (about 1uf) on the AGC line? Does it look OK with a real TV signal? It looks like you had a video game hooked up when you took the pictures. I remember sometimes TV's from the 70s and 80s would get a little fussy with games and VCRs, but looked just fine with a signal from the antenna or cable.
I'm just thinking out loud here.
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