http://www.elecraft.com/K3/k3_app_notes.htm
Approximate shipping date - Approximately April 23-24, 2008
Serial numbers 660 through 782. (As early as S/N 654 may demonstrate
this problem, but we think the problem starts with S/N 660.)
I put the front panel on last night. Should have read emai
I'm posting an alert with details on this by end of day today. (Both on
the web page and to the Elecraft list.) We're just finalizing the docs
right now.
This will include the serial number range and instructions on adding the
ground wire to correct it. We only became aware of this late last w
Fred,
The front panel ground patch has fixed all of the problems associated with
using biased element microphones that I am aware of. The original three K3s
affected were SN 690, 728 and 729. Since then several others have complained
about the same problems, although I haven't heard if the pat
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