[Elecraft] KX1 Please need help with T/R thump

[Jerry W7ANM]

My KX1 has quite a noticeable and irritating "thump" or "plop" going back
from transmit to receive. 

This "thump" has a  soft nature but seems rather loud and obvious. I have
tried different headphones and it doesn't seem to help much. If I set the
T-R delay to very slow, the side-tone is fine with no artifacts but when the
delay times out and the rig switches back to receive there is the thump.
Faster delay just makes it thump the same at each changeover to receive. The
changeover from receive to transmit on the other hand is smooth and quiet.

I built this KX1 a while ago and the thump has always been there. I always
intended to ask the list about this but never got around to it and I thought
I could live with it. After using my other QSK rigs, K2 included, and I go
back to the KX1, I am reminded that the KX1 must have a problem and that
this is abnormal.

Has anyone seen a problem like this and found a solution? Any ideas on where
or what to check?

Any help is greatly appreciated.

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