[Elecraft] [K2] AF Gain Control

[KBG Luxford]

Hi Everybody,

I am updating K2 S/N 01762 from A to B prior to installing options.  My 
questions regard the AF gain control.  The AF gain control has no effect 
whatever on the level of signal in my headphones.  No, I am listening to 
signals on the ham bands, not just the CW sidetone which I understand is 
at constant volume.  Was there a change to the AF gain control circuitry 
between the Rev A RF board and the post S/N 3000 B boards?  Will the 
change to the AF circuitry that I have yet to make fix this problem?

Thanks in advance,
Kevin
VK3DAP / ZL2DAP