Yeah, I had the same buzz, ramdomly right or left side only.
I thought have solved the problem by separating the ground where I plug amp and my cd player. One on my purepower conditionner and the other directly in a wall outlet.
It worked until today where buzz appear once again :-( !
About 5 hours in total between last time buzz was audible.
Jason told me Mjolnir is very picky about current strangeness... Seems due to cyclotron topology.
Many customers must have written to the support.
Hope the team works on the problem and all concerned Mjolnor will be updated.
To be clear, it's not a lot of customers--out of several hundred Mjolnirs to date, we've had non-resolvable noise problems on 3 of them. They've all been AC-related, as far as we can tell, because they test fine when they come back to us. You could look into a hospital-grade isolation transformer.