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#1
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Per Sams have you tried injecting your test signal direct to the mixer grid? With the oscillator tube removed and signal connected to the mixer grid there should be no reliance on channel selection, because the mixer is post any channel tuning. You could also inject the signal to the shield of the mixer, keeping the shield insulated from contacting the chassis.
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#2
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If your rf generator is not perfectly calibrated to your sets IF you should be able to rock the generator tuning and find out where the signal gets through to the detector. You know the IF is working at some frequency or you wouldn't have been able to watch channels 3-4.
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