Hey man, I've got more words for you. Now, I've used my Primo 8s for the last 2-3 days with the following rigs:
1. iPhone 7 USB, Schiit Wyrd, Chord Hugo (DAC/AMP)
2. iPhone 7 USB, Schiit Wyrd, Chord Hugo (DAC), Schiit Lyr 2 (AMP; stock tubes)
3. iPhone 4s, Pure i20 (SPDIF out), Chord Hugo (DAC/AMP)
I also have a Schiit Bimby, but have not tried it with as the Hugo is just a jem. But shout out...