[Elecraft] K3: Rough audio with amp even using voice recorder

[Ignacy]

Someone played recording of my audio and it sounded a bit harsh. This is K3
serial number 22xx with Expert 2k-fa. Same harshness with either the
microphone or the voice recorder. No harshness without the amp.

Similar harshness with power limited to 500W. I suspected the amp's
nonlinearity. But KX3 with the same amp (400W out) sounds smooth. 

So it seems to be a feedback but not via a microphone.  Any idea of what is
going on?

Ignacy, NO9E



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