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OK, I went back through the whole thread from the beginning, and I see you are not using the RC network from figure 6, and have the sweep generator output termination set to 75 ohms.
Try this - keep the sweep generator output termination set to 75 ohms, but add onto it the RC network from Figure 6. My guess is that the 75 ohm impedance is loading whatever grid circuit you connect to and that is causing the incorrect responses.
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