OK, the 75 Ohm setting of the B&K termination is closest to the Zenith drawing, and has a capacitor of reasonable size in series.
At this point, I'm not sure if the difference is enough to cause a problem, but the best way to find out is to use a direct cable with the Zenith RC network and see.
Another thought: is it obvious which of the B&K clip leads is ground and which is the 750 pF? Could they be reversed?
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