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That looks promising to me - you just need some horizontal sync. It should fade to snow as you drop the level. Have you tried flipping the polarity switch on the B&K ? Do the horizontal clipper, amp, discriminator, etc. circuits check out OK ?
Yeah, I'd use a coupling cap so as not to damage the video source. Maybe a few 100 pF. You don't need a diode if you're feeding in a composite signal.
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