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Thanks jr. I had hooked the O-scope up to the cathode and saw video there, I just wasn't sure because I don't know enough of the theory.
I suppose the issue I'm experiencing is likely not even a AC/DC problem. Because the cathode is negative, and more negative voltage would be more white on the screen. So what I'm having is the zero point not being clamped to 0v, but fluctuating. (Right?)
Now that I think about it, then, a diode would be entirely useless. I probably need some much more complicated circuit. Unless I go before the video amp and correct the issue there, or further back. Hmm...
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