Would it be possible to use the Monoprice THX AAA portable as a Portable DAC, then connect an Oriolus BA300S tube amp to it, for tubes on the go?
About the Oriolus review, I found it on head-fi, share it with you,
Yes, you can run a 3.5mm to a 4.4mm cable into the BA300S. The BA300S doesn’t have a volume control. I’m not sure about the Monolith portable being able to control volume through its line out but if you can’t you can just jack it into your headphone out (not ideal).