I spied your Eastern Electric Dac in one of the pics how do you find it with the Stereomour or tubes in general? I have nearly pushed the buy button on one a couple of times over the last 12 months.
Love it, and I've had it since 2010.
The op-amps are socketed and there are a variety to try, kinda fun, but I like the 12AU7 output better. The single tube is accessed from a port on the back panel, so you can roll away without removing the case, and you can hear differences between tubes -- I've been able to put those old Foreplay 12AU7 purchases back to work.
As you know it has a Sabre DAC and a variety of digital inputs. I only wish the input switch had a remote control sometimes so I could switch between TV, BluRay, and the Laptop easily, but that is pure laziness and not a reason to not buy the thing. And they may have fixed this by now, but my version will not accept hi-def PCM via USB so I'm using a USB-SPDIF converter from the MacBook for music as a workaround since all the other inputs *will* accept hi-def files.
I've A-B'd it against an Altman DAC with battery power and much preferred the EE.
And it works fine standing on it's side!
Sheesh, 2010 digital, that's ancient.
/pRC