[Drakelist] R4C static after Sherwood 3d mixer mod

[K4GM- George]

I have obtained an R4C with many of the Sherwood mods installed 
including the solid state 3d mixer which is supposed to eliminate the 
dreaded frying crackle.   Unfortunately occasionally I hear a bit of 
static sounding to me like what a brief solar flare might sound. It is 
not really a hiss but more like a strong static crash.  It is definitely 
not simply QRN!  It is infrequent and I can still copy over it.  Before 
I open it up and start reviewing the wiring on the mixer mod, has anyone 
else had experience with this type of problem?  Is there a known culprit 
such as one of the tubes going bad??  Any and all suggestions appreciated. 

George K4GM
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