I posted earlier about tracking down some hum with this amp. I also thought that the conversion to a 3 prong ground would be trivial. However, the Sunn 200S has a phase reverse switch and I remebered learning a while ago about fuse placement and safety. Now I could be wrong about some of this, my memory isn't the best. So here is the power section of the schematic with some added info about the wire colors: Initially I thought I could just swap out the cable and put the green to ground. But I came across this for 3 prong conversion on Fenders: This is all fine, but I thought I remembered that you are supposed to have the fuse and switch on the "white" wire for safety reasons. Can I get some clarification on this? Also, how do I deal with that Phase Reverse switch? I haven't run into that before.