tube noise please help

I have Supratek Cortese (tube preamp) running a pair of mono block Krell (FPB- 250). The noise from the preamp was terible ( even with the cheater plug for preamp and remove the bypass cap inside the amp ( as Krell recommented for tube)). thanks for any advices.
ass: cd: Mark levinson 37 and 360s
speaker : B&W 802'S Nautilus
conditioner: Richard gray 400s
wire: interconnect: audience 24, spkeaker: van del hul(revelation)