[Elecraft] Re K3: 4th Harmonic of AM Station

[Jay]

Found the problem:  Seems the "key out" line to the linear was causing 
it..... Don't use the linear anyway so I just unplugged that line.  
Thanks for the help.
As a note, the "radio room" is upstairs so I do not use a ground since 
it causes all kinds of ugly things to happen with tuning.  From up here 
the nearest dirt is about 25 to 30 feet away.

Jay,  W6JDB   Bend, OR