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AM and FM uses the same IF tubes but for the last, the FM limiter, but I doubt that's it. Might be an alignment issue, esp on the last stage of the discriminator, but with out proper tools and know how you should not attempt to adjust. Unless a resistor is WAY out I can't see how this could be it, like 500% or more. Most tube designs work fine with out of spec resistors, unless the resistor is in a tuned circuit or is gold banded.
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