I had bad hum/rfi problems. It was due to an unshielded interconnect between the turntable and the transformer. Are you using an unshielded interconnect between the preamp and the mono amps? You can test whether it is the interconnects by using some freebie interconnects, which are all shielded. This is a technique recommended on the VPI website and it worked for me. Also, if the BAT uses tubes for the phono stage, it may help to replace the tubes in the phono stage with some low noise tubes. Also, make sure everything is grounded properly to reduce RFI. I feel for you, since I lived with the hum for almost a year before figuring out the cause.
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