quick observation/question...
I have found the BP26 power supply relatively "evil" in terms of inducing hum when close to my BDA.
Hence I have banished it from being near my BP26 or BDA (or anything else for that matter!!!)
And I am XLR all the way with all my components (including cartridge leads and phono preamp) so it wasnt (or highly unlikely) that it was induced via cable interference.
Have you experimented with this at all?
Peter