Tube Preamp to go with Bryston SST2 amp and Magnepan 1.7i speakers

Good luck, it's a critical component with lots of options. Think about future flexibility.

I went Vintage, never been happier, both Phono and FM are the best I've ever had (I'm 72)

McIntosh mx110z

http://www.berners.ch/McIntosh/en/MX110.htm

https://www.positive-feedback.com/Issue77/vintage_mcintosh_experience.htm

My timing was good, they are going up in price.

Even if you don't go Vintage, look at the features that many current equipment have dropped. I wouldn't live without a balance control, and, if you listen to low volume, a properly engaged 'loudness' control keeps the music involving rather than just low level background music.

https://en.wikipedia.org/wiki/Equal-loudness_contour

mesch

I never owned anything using 6sn7. I had to replace 6sn7 in my Cayin amp, It was surprising how much difference in sound the replacements were. My first choice: bad. The Cayin went from wonderful to lifeless. Brent Jesse let me exchange them for ones I much prefer.

Just saying, it’s a tube to research, find reliable descriptions of differences, buy from a source that will allow return, if a new amp, ask OEM about options if any. ...

I imagine they would be very good in a preamp, especially with your preferred 6sn7