Retube SFL 3 with Amperex JAN (Joint Army Navy) 7308 "white letter". Detailed, better bass, deeper soundstage, to my ears the "Best". NOTE: Only 2 tubes are needed, no matter if you are using SFL 1, 2 or 3.
Re-Tubing A Sonic Frontiers Pre Amp
Has anybody had any experience re-tubing a Line One, Two or Three? If so, what kind of tubes did you use and what results did you get?