Problem solved (I think)
I believe that the front panel PCB underwent a change somewhere along
the line - incorporating the changes recommended to the AF gain control.
The K2 I am working on has a low serial number - 01762. However, the
original owner who was building it struck trouble with the front panel.
When I got it, I tried repairing it, but gave it up as a bad job and
got a new front panel kit from Elecraft. On plugging in this (new)
front panel, I found I could not vary the AF gain. I swapped the front
panel for another from my other, post S/N3000 K2, with exactly the same
result - no variation in AF gain.
I have proceeded with the A to B mods and have completed the AF gain
changes on the control board and also the RF board. When I came to the
front panel, it appeared as if the recommended mods had already been
applied. So I buttoned up the K2, applied power, and voila, the AF gain
control worked perfectly.
Thanks, David, for your explanation of what was going on.
73
Kevin
VK3DAP / ZL2DAP
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