[Elecraft] K2 - Question on control board

[Don Wilhelm]

  John,

R7 is needed for the base K2 current sense.  You should have changed it 
to 1.78 k when you did the A to B upgrade.  OTOH, C44 is not used, if 
you have any capacitor (to ground) installed that connects to the 
emitter of Q11 and one end of R7, remove it, but leave the resistor in.

73,
Don W3FPR

On 12/30/2010 8:13 PM, John Wingard wrote:
> I'm in the process of upgrading my K2/10 (SN 1057) to a K2/100. I am also finishing up the KAT100 tuner and have a question. The tuner instructions state to remove C44 from the K2 control board. I have a Revision A control board without a C44. It also states that if this is the case, a capacitor may have been soldered directly across R7. On my board, a resistor is installed at R7 (no capacitor). Do I leave R7 in or take it out? Incidentally, I did all of the Rev A to B mods a number of years ago, so this looks like the only thing left to check on the control board before proceeding.
>
> Tnx de John, WB4GLJ
>