Try a used Audible Illusions Modulus 3 or Conrad Johnson tube preamp.
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Krell (obviously not tube) mate beautifully with B&W speakers.
There is a Krell KBL listed on ebay for $999. It says that the unit has new capacitors. Item number is: 2581740693
Unfortunately it is the weekend, and Krell is closed and there is only 24 more hours till the end of the auction. If it is true (and you don't need a remote) it is one fabulous deal. If it were me, I would contact the seller, and say you will bid, but only follow thru if Krell says the work was done fairly recently.
If you don't like the sound, you can always sell it and make money.