Have you grounded the phono preamp? Sometimes grounding will reduce hum.
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Hifimaniac had the solution. I knew enough to make sure the tone arm ground was secure, but since there's no obvious place to ground the phone pre chassis to the B&K, it just didn't occur to me to ground it. I also assumed that the phono chassis would be properly grounded through the RCA outputs to the B&K.
I connected a jumper from the ground pole on the phono to the ground sleeve on the B&K preamp input (ie the outer part of the RCA). It sounds great now, and much better than playing it through the Adcom.