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It's been my (somewhat limited) experience that connecting a true earth ground does make a small difference. First, these older radios were designed with the assumption that it would be connected to a ground, so there is also a safety factor involved.
It seems that the noise level drops a bit. The radio seems a little less "staticy" with the ground connected. I'm assuming the ground drains off some of the power line interference, etc.
Then again, maybe it's the coffee! Sandy G, chime in with your thoughts!
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