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
skipper320
I am not familiar with SFL1 but a Valvo 6201 or 12at7wa will suit it nicely. 
Going sweeter a Mullard CV4024.

G
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I run a Genalex, Gold Lion in mine,... fabulous! GL with yours @skipper320; it's a terrific linestage that paired with the right amp will bring you pure sonic joy. I've run mine with TAD, Hibachi Monoblocks, a Cary 808R tuber, and soon a Sugden Bijou (Class A) "AmpMaster". It's a wonderful piece