I concur that the Adcom 565 is a very nice preamp with tone controls. If you prefer a remote ( I can't live without one) the 750 is probably better still and is newer. Have not heard it, but I've found Adcom preamps very good sounding and I think better than their power amps.
The other option are the Quad units, can't comment personally but they are reputed to be quite good - check out a recent Absolute Sound for more.
The other option are the Quad units, can't comment personally but they are reputed to be quite good - check out a recent Absolute Sound for more.