[Elecraft] KPA100 SSB Distortion

[jferg977 at aol.com]

Once again, I throw myself on the mercy of the wizards of K2.

Just finished KPA100, did all of the sequential tests, got the right 
numbers, did the alignment routines, buttoned it up and now it works 
just like it did before - quite well until I enage the amplifier by 
going to 12 watts.  Then voice becomes distorted - almost unworkable.   
I checked rf lead from rf board to amplifier and it looks ok.

I used a possibly questionable wattmeter to do power callibration.  If 
this callibration is off, will the impact be to help me set the bias 
wrong?  I can borrow a known-to-be reliable wattmeter and redo the 
settings, but I suspect something more radical is wrong.  Toroid leads? 
 mine checked out when I built it and looked ok, but???

any ideas.

73   john ferguson KI4NGH