I guess I was lucky with mine from the first batch it ran nice and quiet even with sensitive phones. I should point out that I never tested the stock front tubes as fitted JAN-GE 5654W in the first week.
I use it mainly with HD800 Sdr modded headphones and feed it from the from the single ended side of the Chord Hugo TT DAC, the balanced side goes to a Sennheiser HDVA600, depending on the music and my mood I enjoy the differing presentation the tube and the solid state give me. I do tend to listen more to the tubes finding it compliments a wider range of music being slightly more relaxing yet still very precise.
Other headphones that sound good and benefit from the ZDT Jr I have found are HD 600 and 6XX HD 700 and surprisingly to me the Focal Clears from the low z output.
A bonus in this setup is it sits near to my powered desk speakers and the pass through works even when the amp is switched off
Though it's tiny, it manages to power even high ohm headsets with amazing accuracy. It works great with the drop usb-c to usb-c and my Phillips shp-9600. Soon enough I'll be using the Akoustyx...
I have an external amplifier with no integrated DAC and I only have an xduo xa10 as a dac/amp can I use the xduo xa10 as a dac only with an external amplifier?
So I bought the HD6xx a few weeks back and when I finally got the packages i got some Noir 99. ever happened to any of u guys and how did it get resolved