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Well, thank you to all who replied and if I had a live TV feed to videokarma, you'd see me knocking my head with my fist for not checking this first: it was the PCB grounds as Dave and others suggested. I had put a tight ground bond on the IF board several days ago and only checked the Video/Color and sound/sweep boards with an ohm meter at that time. But the moment I bonded the grounds to chassis on those two boards the problem was solved. What a relief! Now on to getting rid of the nasty cataract and getting the color setup spruced up. MANY THANKS AGAIN!!!
(PS: I'll try to get some pictures out tomorrow!)
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