[Elecraft] K3 VFO Tuning Noise

[Dave Hachadorian]

Yesterday afternoon, I installed new KSYN3A Synthesizer Boards in 
my two K3's.  This morning, tuning one of the rigs across a dead 
6 Meter band, I can hear a weak increase in white noise whenever 
I turn the VFO knob.  I didn't notice that yesterday morning. 
Perhaps the new synthesizer board has reduced the Rx noise 
threshold such that I can now hear that noise?  This particular 
K3 is s/n 059, and I know there is a VFO Noise Reduction Mod 
available, but that mod describes the noise as "ticks."  The 
noise I'm hearing is a small increase in white noise, even with 
the 6 meter beam connected.

The noise increase is obvious, but subtle, and I wouldn't 
consider it a hindrance to operation, but it has raised my 
curiosity as to why I am just now hearing it.

Ideas would be appreciated.  Thanks in advance.

Dave Hachadorian, K6LL
Yuma, AZ