As in a previous response, I would strongly recommend a hybrid tube/solid state preamp. I was very fortunate to get this advice many years ago from a highly regarded hi-fi guy. I bought a New York Audio Mosfet Minuet in A hybrid preamp and paired it with a vintage Bryston 3 amp. I still have that rig and the sound is spectacular, The Minuet is considered by many a classic based upon clarity, definition, bass response and fabulous depth of "sound stage". As the other post said, the New York Audio Mosfet preamps were way ahead of their time and even today offer excellent performance when compared to today's gear in the same price range. A couple of audiophile friends bought the Minuet in A after hearing my setup. Unfortunately, it can now only be bought as used equipment and is extremely hard to find as people just don't want to part with them, like me. But if you look hard enough you'll find one. Even if you find one that needs a little work, George Kaye, the original designer of the Minuet can refurbish it and make it like new which he currently is doing to my Minuet for approximately $350-$400. Of course that depends on what is needed to be done. If you can't find a Minuet in A on the used market, I've heard very good things about Vincent's hybrid preamps also which seem to be great values based upon price / performance. Good luck.
