Responses from toms

Air Tight ATM-2 mechanical hum.
FWIW my ATM-2 is basically silent, though you can hear a slight hum from the power transformer if you put your ear right next to it (careful around the KT88s). If you're on the West Coast and once you're beyond the warranty I would recommend Nick ... 
Air Tight ATM2 Direct Driven by CDP?
I've had a lot of success using an Air Tight ATC-1 Pre with my ATM-2. Great MM phono stage. Not the most transparent pre in the world, it tends to sweeten things a bit. But overall very pleased with it.