Easiest way to get rid of hum in MK-IV?

[phrygiandom]

Ever since moving to Italy I've noticed a "hum" on channels 2 and 3 of my Mark-IV. What would be the best way to get rid of it. I also hear it in my Peavey Windsor, so I'm pretty certain it's not the amp or pedalboard. I use a 1000w stepdown transformer to power my Furman strip. Everything is grounded. I've tried different grounding positions on the MK-IV as well with no luck.

What's the best way to get rid of the hum? I've read that the Decimators won't get rid of hum. Any advice would be greatly appreciated.

Dave

 

[Boogiebabies]

http://www.ebtechaudio.com/products.html