The most recent mod to the KSYN3 board(s) is the third mod to that board. The second mod potentially undoes and redoes the first mod (unless you chose to do the first mod via SMD change).
First mod, applicable to all K3s shipped before 12/22/08:
http://www.elecraft.com/K3/mods/ELECRAFT_Application_Note_KSYN3_ALC_Rev_A.pdfSecond mod, applicable to any synthesizer without a metal plate glued to it:
http://www.elecraft.com/manual/ELECRAFT%20KSYN3%20Stiffener%20Mod%20Rev%20D.pdfThird mod, applicable to S/N 3922 and later:
http://www.elecraft.com/K3/mods/KSYN3%20DDS%20Gain%20Modification.pdfI have done the first mod, but would have to undo it and redo it if I did the the second mod. And the third mod would then await.
Fortunately, I have only one KSYN3 board--not having bought a second receiver (which includes a second KSYN3).
73, Paul W8TM
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