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 The new mic works fine without the pre-amp ( it could be a bit louder though )  and so does the original hand mic I have been using with this radio, but I only hear the noise when the radio is keyed whether its through just the head phones or through a monitor radio on the same frequency with the pre-amp. So I got to figure if it is the RF energy getting into my audio lines while the pre-amp is inline or is it the wall brick for the pre-amp...



T23