Hi Bakis,

> output is this hum so annoying that can prevent you
> from mounting the a199 inside the a100 frame the

I suspect duffnuff's experience with the spring unit is fairly
typical. When I had less modules in my second 6U case I tried moving
it around inside by hand to see if there was any position where the
hum would be acceptable, but in the end I concluded there wasn't. I
now have it sat loose on the top of the case, but there seems to be
only one particular position where the hum is not too bad. If I move
it in any direction by more than a few inches, or twist it around, the
hum makes itself known! I don't find this any real problem, but it is
not as convenient as having it permanently screwed down somewhere
where no harm can come to it (i.e. like knocking it off the case...).

Tim

[The views expressed above are entirely those of the writer and do not
represent the views, policy or understanding of any other person or
official body.]