[Elecraft] K1 Mute problem... located the problem

[David L DuPuy]

Thanks to all three of you who responded.  Don, you put your finger on the
problem.  Soldering a wire across the differential inputs of U3 produced a
clean sidetone.  The voltage on the Q10 gate was only 2 volts during
transmit.  After pulling Q10, I am now getting 6 volts on that solder
point, and have requested a replacement 2N7000 from Elecraft.  Many thanks
for your help!  and I believe this is the last of a couple of
build-problems!  73,  David  AC4BN