Yep, that's the point I don't have a DAC unless my Fiio X3 does count as a DAC with the Mjolnir...? But I doubt it'd be a viable combination. So I just go for the Lyr+Bydrost combo instead of Mjolnir alone.
Thanks for the tube suggestions kothganesh and NinjaHamster, I have yet to dig deeper in that issue. By the by, the factory tubes of the Lyr are that..."minimal" to those what you listed above? But I don't want to get off topic.