Hi all, I have that U87 mic for repair. The customer told me that it stops sounding when record voices but not with instruments. It sounds to me the "typical" problem with moisture that makes dust conductive with humidity... I think that, normally, it can be solved cleaning the gold free pvc/mylar area. The problem came when I opened the mic. There are dust, yes, but I see also that dark area arround central terminals, front and back. I don't know what exactly is that dark coloration, seems like oxidation? it needs to be reskined or it can still be ok only cleaning the pvc gold free area? I'm not sure what to do with that.
If someone knows what's it or how to proceed I woluld be bery grateful.
Thanks!
Arnau
If someone knows what's it or how to proceed I woluld be bery grateful.
Thanks!
Arnau