I think you have a very good idea re pairing a tube pre with the A-45.
I chose a couple of Conrad Johnson tube pres (ART and ACT 2.2) to go with my Pass XA.5 ss amps. You didn't mention budget (always important when someone asks for recs). Less $ than the ART or ACT 2.2, I'd feel safe in recommending the Premiere 16, maybe the 17.
Find the right tube pre and I think you will be real happy. Good luck.
I chose a couple of Conrad Johnson tube pres (ART and ACT 2.2) to go with my Pass XA.5 ss amps. You didn't mention budget (always important when someone asks for recs). Less $ than the ART or ACT 2.2, I'd feel safe in recommending the Premiere 16, maybe the 17.
Find the right tube pre and I think you will be real happy. Good luck.