The Vali tubes aren't replaceable so it's not a concern. You take what they give you. The Vali sounds clear and detailed. It has a little bit of warmth to it, but it's not a syrupy/tubey sounding amp. I went from an Asgard 1 to a Vali and, for these particular headphones, it was a step up. The Asgard 2 may be a different case, but it also costs significantly more.
12/22/14 at 10:23pm