I'd be interested if others hear a positive difference with the Abbas vs a Mutec. I was impressed that it sounded as good as the Mutec and I never liked the Mutec interface so for me it is nice to have one cable in and one out and not worrying about a million settings and buttons on the Mutec...
I believe the EB91 and EAA91 are the same tube or interchangeable. I have the SE version and can confirm the tubes are as he described in the price list and that the DEM clock is part of the unit. I alsed Abbas about whether his new tube clock would bring anything to the table with my...
You might look at the Audioquest Niagara line of products. I use their 1200 model and it replaced a very good AC regeneration device with equal to or better sound from my rig.
I'll jump in that I have the DAC 2.2 (fantastic) and have both a Mutec MC3+ USB with separate LPS as well as the Abbas USB/SPDIF converter (the nicer of the two he makes). Considering the Abbas is cheaper even with his cable and it sounds at least as good (it is ruthlessly revealing), I would...