Planning on pulling out my old Cal Audio Alpha DAC, and using it thru my Sennheiser HDV 820’s unbalanced analog inputs (RCA). The source will be a TASCAM SS-CDR250N media player, connected to the Cal Audio via it’s coax connection.
What 12AX7 tubes would you use in the Cal Audio? I have a pretty wide variety to try, including vintage Brimar, Mullard, and Yugo’s. I’m sure any will give that tube warm midrange, but also looking for some smooth brightness. Appreciate your thoughts before I start rolling tubes. Thanks!