Yes,
There are some. The factory provided me with a free upgrade kit which
eliminated a "swishing" sound in the received audio which occured when
QRN modulated the AGC. This was especially a problem in CW mode, on
lower bands.
Also there was a mod kit which lowered receiver audio hiss--I installed
both at the same time on the kitchen table. They had 'names' but I can't
remember them any longer. The factory should recognize these updates by
description. They are a MUST--performance was greatly improved.
73, Roy K6XK/0
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