I don't have anything to add about the amp itself beyond what I wrote earlier. I use it every day and really enjoy it, have had zero problems. The 6P14P-EV tubes and re-issue TungSol 12AX7's have become the default setup, very quiet and good sounding.
I did replace the Nuforce uDAC between the FX10 and the iMac with an Aune Mini DAC SE and that was a tremendous improvement for not much more money than the uDAC.
I did replace the Nuforce uDAC between the FX10 and the iMac with an Aune Mini DAC SE and that was a tremendous improvement for not much more money than the uDAC.