[Elecraft] K3 Spurious TX Spur

[Walter Miller, AJ6T]

My buddy K1VW, who is not on this reflector, asked me to look into a 
problem with his K3, and I am turning to the reflector for assistance.  
John received a report from another station (not a local) of a spurious 
emission while transmitting CW on 160 meters.  Evidently the spur was 
loud enough to attract some attention.  I searched the reflector 
archives for the past six months and did find anything on this topic.  
The other station mentioned that this is a known problem with the K3, 
and that the fix involves clipping a diode.  This is all second-hand 
information to me, and that is all I know about the situation.  Any 
suggestions?

Walt, AJ6T