[Elecraft] K3 Popping noise in headphones??

[N4CW at aol.com]

I can verify that I get the popping (more like a click) and it's  loudest 
between 150 and 100 Hz transition. It doesn't bother me. My K3 is S/N  1326 
and I have the new synth installed.
 
Bert, N4CW