Pass Labs Aleph Amps and Tube Preamps


Is anyone out there using a tubed preamp with the Aleph amps? I have a pair of 1.2's and am looking for a new preamp. Thought I might give tubes a try. Thanks.
rsfphil
I used a Blue Circle BC21. Very nice but I preferred a Placette Remote Volume Control.
I am using Aleph 2 with Audio Research Reference II. The combination is excellent. I don't see any impedence issue. The sound is so warm and sweet.