I use a vintage tube pre-amp (Audio Research LS2 MKII B) with vintage Sumo Andromeda behemoth amps in a bi-amp setup. I have used and both tried both tube and SS pre-amps before and since and the old king has has never loosened his grip on the throne. The thing to remember is that your sound will never be better than the tubes you are using, and vintage is generally much better quality and sound. Of course finding real new old stock tubes (NOS) can be a challenge, not all sellers are trust worthy. As an example a NOS Siemens and Halske Cca 6922 grey plate used to mean a brand new unused tube in the original box. Over time the meaning of NOS as it pertains to this tube changed to mean anything that still tested as OK regardless of how many hours it had been used. Every tube sound different.... have fun.