tubes for CAL Alpha

I've had the best success, by a wide margin, using Sylvania 5751 blackplates in my Alpha. Female vocals are amazing with these tubes, as are vibes, piano and strings. On the other end of the scale, Mullard CV4004s and Telefunken 12ax7s didn't do much for my ears--distinctly grainy sounding. For current production tubes, I haven't tried the Ei 12ax7s that Newbee recommends, but have popped in a pair of cryo'd Electro-Harmonix, which were pretty good.

I second the Sylvania 5751's. I've only put them into my DAC recently but I can clearly say right now that it's the best my Alpha has ever sounded.

For a second-choice budget tube, I'd recommend either a JJ 12AX7 or Sovtek 5751. The JJ is a little more transparent, the Sovtek has more richness.

I also found the famed Mullards to be rather dull sounding.

Good luck!

Michael

Another vote for the Sylvania 5751. In particular, I heard the Sylvania Gold Brand grey 5751 and it sounded amazing - musically balanced, detailed, nuanced, wonderful.