Hi folks, I have two A-199's. One new, which is perfect, and the other
used, which has an audible buzz at mix levels above about 40%. The
same buzz exists in both modules (and sounds like
excessive "emphasis"), but to a far lesser extent in the new one. The
old one tends to bang the springs around more too, as though the
default gain is much higher. So the question is, is this normal Has
the A-199 been improved so that it is now quieter than it used to be
Has the gain level been changed If not, any suggestions on repairing
(or possible grounding issue)

Oh, it occurs to me now that I had intended to swap the tanks to see
if the problem is there, but I haven't done that yet.

Thanks,
Doug