mizioaTry a Schiit Freya for a trial period, it’s got all the flavours, passive, solid state, and tube switchable while your listening, your bound to find the right combo for your system.
Which preamp for a pass labs?
It also has SE or XLR inputs and outputs, the best volume pot there is, a 128 relay switched, even has a remote.
It’s not a glitzy show piece, but it’s got what counts, under the hood, at a very reasonable cost. $699 it's a steal.
http://www.schiit.com/products/freya
Cheers George