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It's the black one.
After watching it for about an hour the picture started getting intermittently jittery with horizontal lines in it. At first I thought dirty tuner - but after messing with the tuner for a while didn't fix it, I pulled out the tv analyst. The problem remains when I put an IF frequency signal prior to the 1st IF amplifier and after the tuner, but it is gone if I put a video signal after the IFs and directly before the video output transistor, limiting the problem to somewhere in the IF circuits.
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The quality goes in, before the cat goes on!!
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