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dear sir,
try checking/replacing the very small (in value, not physical size) capacitors around the oscillator tube, tuning gang, and in the oscillator circuit.
i had the same experience with a very nice Zenith 1950's radio years ago. it gave me fits until i replaced a tiny capacitor in the oscillator circuit. it received around 99 to 108 megs. below 99 megs, i could not get anything and there were strong locals down there. no matter how i adjusted the oscillator coils for the low part of the band (92.5) and the high part of the band (106.5), <99 megs was not received.
hope this helps.
steve
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