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Not sure what you mean by "brum" noise--are you sure it's from the preamp and not the amp's transformer? If you're talking just about noisy tubes in the preamp, maybe changing the tubes will eliminate the noise. If you really want a balanced preamp, Jadis is a tough one to beat, another possibility would be BAT, which is a true balanced preamp.
i agree with ralph.
i am amazingly happy owner of atma-sphere mp-3mkiii pre coupled with m-60 mono-blocks. fully balanced. and amazingly happy means i am done trying to improve components--and am back to spending money on just collecting music (well, as soon as i complete my synergistic research power cable, interconnect, speaker cable, tesla powercell campaign).
and ralph gives great advice. and amazing customer support, too.
and made in usa.