I just switched out my B & K M200's to Rogue M120's. I had the same problem "the 60HZ" hum. I tried everything, and it was driving me crazy. I had the amps going through an Adcom Ace 515, took out it's ground still nothing, then as a last resort, I eliminated the Ace and went direct to the outlet with no gound (Took it off in the box and insulated it)I have the Pre and CDP on another line... the hum is almost gone, all but some very minor residual amp/tube noise. Good luck I know what your going through.
Hum or buzz through speakers
I just turned over my system from all B&K to Audio research and McCormack. I was running the Audio Research through the B&K until Monday when I put the McCormack DNA-1 in place. I am hearing a hum or buzz through my Vandersteen's audible from three feet away. Preamp is ARC SP9MK2. Tubes are 6922 Golden Dragons which I am going to change over to some Amperex 7308 USN-CEP. Would this be tube noise that perhaps the McCormack is picking up where the B&K did not or is there something in the McCormack amp that would cause this.
Eagleman
Eagleman