> also, i'm curious if anyone has attempted to sheild the reverb unit
> perhaps covering it in tin foil, and attaching a ground from the
> transformer or bus board to the foil

We have built a shield (before the PSUII) made of 1 mm steel that covered
the spring system completely but it did not help very much. The problem is
the magnetic shielding not the electrical shielding. A simple foil will not
help from our experience. The only material I know that can be used for
magnetic shielding is u-metal (the greek u). I don't know if the same term
is used in English language. But this material is very expensive and hard to
find.

We show the A-199 in a suitcase with PSUII in Frankfurt. I will tell you the
results after the fair.

Best wishes
Dieter Doepfer