error404I'm getting this for my home setup. Right now, I have ATH-M50X and a Behringer UCA202. I use the headphone port on the UCA202 which has an output impedance of 50 ohms. So swapping to this tube amp with a 10 ohm output impedance will be better.
Ideally, you want an output impedance that is less than 1/8 of your headphones impedance. So for the Beyerdynamic DT770s(250 ohm), these would be great. For the ATH-M50X (32 ohm), 10 ohm isn't ideal. But it's still an upgrade for me, so I'm doing it.
I also joined the AKG K7XX (63 ohm) drop. Those are mainly for work. I'm waiting for another ODAC+O2 drop for that, but in the meantime I'm going to drive it with my Fiio E10K. It might not be quite powerful enough to make it really loud, but the output impedance is < 4 ohms on that amp, so that's the plan.