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Bill,
I never want to speak for Dave Wronski... :) , but I think what he
is saying is that if you have a ground plug on your tank AND on your
amp, you have the potential (pun intended) for a ground loop. This
could happen if you plug your amp into one outlet and your tank into
another, and the two outlets were not using the same physical ground
path.
I am not an electrician, nor do I play one on TV, so I won't comment
on the merits of removing the ground (third) plug from your tank.
But I think Dave is right, since you never use the tank by itself
(!) you will be grounded by virtue of your amp. If you have an old
Fender amp, like your Super, you could plug your tank into it (but
then again your amp probably has a 2 prong outlet) to keep
everything on the same path.
It looks like one would need to remove the ground plug on the tank.
But don't quote me on that, please consult an electrician to be
safe. Either that, or always plug your reverb unit into the same
outlet that you plug your amp into to get the same ground.
Another source of hum with the reissue reverb units is the
footswitch cable. Bruce from the Cocktail Preachers posted a
document in the file area which explains how to fix that.
(Unfortunately its a MS-WORD document, but I can convert it if there
is interest). Or simply disconnect the footswitch.
BN