Hmm, I'm sure I've got some Ei tubes somewhere. Just can't remember if I bought them for the LD or my DAC. It's still a lot of boxes that we haven't unpacked here so I'm sure I'll find them eventually but it might take a while. Anyway all the tube possibilities in addition to all the other settings you can change makes the Ember a real gem. The included Conn tube does also sound really great, I may actually like it better than the 6SN7 one (those are the only two I've tried so far).