I like the idea of tube pre-amps with solid state amps. Tube pre-amps require little maintainance, tubes are generally reasonably priced. You can really get a great sound with this combination. However, I've listened to the Bryston preamp and have not found it to be congested in the mids. So I'm not sure that your switch will get you where you want to go. Have you listened to other pre-amps and did it make the mids sound better? Speakers, cabling, and the listening room (including speaker placement) can have a huge effect on the midrange. Since I don't now what you have it's hard to comment.
Tube preamp for Bryston 7B-ST
I'm thinking about switching out my Bryston BP-25 preamp to a tube preamp. While my bass is solid, the midrange can sound congested with dense musical material. There are a number of choices with great reviews. Please help! I'd love to hear about your experiences combining tubes with SS amps, especially the 7B-ST's. Thanks in advance.