[Elecraft] [K2] AF Gain Control

[KBG Luxford]

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