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

Hello all,
I just acquired a SF SFL-1 preamp. What’s the sweetest tube any of you SF fans have used in this preamp?
Thanks

skipper32002-13-2021 10:35pm

joecasey Details Discussions Posts This discussion Message User 484 posts 02-28-2021 at 05:24pm Copy Comment URL Report Comment Edit Delete SFL 1 lean side of neutral so my favorite was Amperex / Phillip Holland.