I have NOS Mullard 6201 (12AT7) in my Sonic Frontiers SFL-1 and it sounds incredible. That preamp can be jumpered to use 6922 which i have grown tired of so I picked up a Kevin's Stash 6201 from upscale and it was worth every penny. When I got this pre it had a "NOS" Brimar 12at7 in it that sounded dark and lifeless. The Mullard tube transformed it. I just took my CJ Classic 2SE out of my system , I replaced it with a Zesto Leto and am struggling which to keep. The 12at7 SFL or the 6922 CJ. I think I'm going to sell the CJ and keep the SFL, it sounds that good.
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