[Elecraft] K2 Problem

[VR2BrettGraham]

W3FPR replied to K0ARO, who noticed nasties on transmit when
K2 switches to KPA100:

>You could be correct that rectification in the TR switch in the KPA100 is at
>fault, BUT that should not take place under normal conditions.
>
>Check the bias voltage to the TR switch (junction of R11 and R12) if it is
>lower than 90 volts, that is your problem - trace it back to the origin.  A
>non-functioning Q6 or Q7 could also cause similar problems.
>
>The diodes themselves are likely OK unless they have suffered abuse
>resulting from some other problem.

What perfect timing - I put my K2 into service after about a year
& it does same thing, as well as now making other undesirable
noises when I plug in SO2R mic switching system that is same
as when K2 was last used - right down to the cable that plugs
into the radio itself or the radio the K2 was to replace.

Hopefully some similarities here - cheers!

73, VR2BrettGraham