Get a 1/8" Phono Jack or 1/4" or rca jack mount in back of radio get yourself a small piece of coax or shielded audio cable cable Center to Positive of the Phono Jack etc.. cable Shield or Braid to Negative of the Phono Jack etc..
other end of that cable Find capacitor c119 center conductor of audio cable to positive side where c119 was ground shield of audio cable to a nearby ground pretty much the same as 148 injection
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