What’s the best tube for a Sonic Frontiers SFL-1 preamp

Mullard 6201 I believe is what I used to run when I had a SFL 1, but that was sometime ago. Very nice preamp with the right tube and for the money. Sold the SFL 1 and moved to a ModWright SWL 9.0 SE which I liked much better. I recall the Mullards were what everyone was using and UpScale Audio recommended too which is where I think I purchased from. I remember the Mullard was much better than the stock tube if that helps.

oddiofyl

The SF SFL-1 is a nice preamp, well made but I would strongly suggest to leave it as is and just enjoy it. No doubt Chris can improve upon his earlier work but at what cost? Before I would spend the money, I’d buy a used ModWright SWL 9.0 SE and compare the two and sell the one you feel is the lesser of the two. I did this and kept the MW. The ModWright is in another level and will cost you less than modding your SFL-1. I also ran the Mullard 6201 in my SFL-1. Been awhile since I looked up what a SWL 9.0 SE go for but I’d guess around $1200. The ModWright is built equally as well and Dan can mod it I’m guessing for less if you later get the itch.