Totally by mistake I figured out how to do this mod without even opening the radio case.
I live at about 140 above sea level on the coast and my radio picks up everything. So I was up Turkey hunting last week, and in the late afternoon I jumped in the truck and turned the radio on. The elevation was around 3500', but I was in a bad location. I was surrounded by mountains on every side.
Anyway's to make a long story endless, I tuned to 38 LSB, and heard some guys from Australia talking back and forth, and there was absolutely no background noise. I thought my radio was broke. I checked a few more channels up and down, and made 2 contacts to Those guys in Australia. At this point I really did think the radio fixed itself. I mean every frequency was quiet. Stupid me. I was hoping it fixed itself, but when I was leaving and slowly losing elevation and getting closer to civilization I realized the elevation, lack of electrical infrastructure, almost 0 people was the reason for no overload. Damm! Oh well now I know how a radio should sound.