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I pulled out a Sams 836-9 to check the first RF stage in the Mag, listed as "AM-FM RF amp"
It shows a germanium PNP "61P1D" the base voltage is -0.9 v, emitter -0.7 v, collector -13.9 v.
What is possibly affecting only FM is the balun and bandswitch. Measure from each antenna terminal to ground to verify continuity. The one antenna terminal then runs thru the band selector wafer to the dual-tuned (AM and FM) network feeding the base of the subject transistor.
Of course, the transistor could be crapping out on higher frequency, which may be what you are already on to.
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"When resistors increase in value, they're worthless"
-Dave G
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