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You should be able to inject your IF signal directly into pin 1 of the PIX 2nd detector and see something if it's strong enough to drive that point.
When injecting into the grid of each IF stage, did you pull the preceding stages' IF tubes (to make sure they are not driving some garbage in with your injected signal)?
Edit: have you checked for open coils in the detector circuit?
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Last edited by old_tv_nut; 04-27-2018 at 11:15 PM.
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