A local ham had the exact same problem. It was not a problem with his setup.  
Elecraft replaced the PA board and the problem went away.BruceKS4V
-------- Original message --------From: Jim Miller <[email protected]> Date: 
8/1/18  10:42 AM  (GMT-06:00) To: Ignacy <[email protected]> Cc: 
[email protected] Subject: Re: [Elecraft] K3s+KPA500 SSB audio 
distortion 
I ran my KPA500 for several years at 500w and often received unsolicited “great 
audio” reports. CM500 was my headset. 

Something is wrong with your setup. 

Jim ab3cv (have kpa1500 now)

On Aug 1, 2018, at 11:09 AM, Ignacy <[email protected]> wrote:

Could it be RF feedback? You can check it by transmitting into a dummy load
or lowering the drive power.
Ignacy, NO9E  



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