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To the OP:


How do you think the PA transistors in your radio are biased?  If you understand that taking clean RF from a clean radio and inputting it into an improperly design amp will result in a dirty signal, why would it make any difference if you inserted an additional PA stage in the middle? 


I can hear it on a $0.99 speaker if that amplifier is putting out a ridiculous amount of harmonics on a band that I happened to be tuned to...which is where the problem is.  Avistar23 nailed this one.  I have experienced this and it's really easy to reproduce / demonstrate the problem.