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An interesting development: I replaced a 120uH inductor in the IF stage with a 100uH inductor available at Radio Shack. I now get a very decent picture via the tuner! I don't think it's perfectly aligned, though, as I still get a fair amount of 'fuzz' from a directly connected RF source.
And, unfortunately, the picture still smears in areas of sharp contrast, even over the tuner. There must be some other problem in the video circuit that's causing this, rather than a simple impedance mismatch.
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