Tony,
Thanks for the excellent deal on the DAC. I hooked it up to my Oppo 105 CD player and listened for a couple of nights and was fairly impressed. It was definitely better than the DAC in the Oppo. More detailed and I heard some background sounds that I never was able to clearly make out before. The bass was the most notable new development. In general a good investment/upgrade. Then I started reading some of the other posts on the Audiocircle regarding the the Modwright enhancement and other tubes to roll into the DAC. So last night I dropped a Mullard 5AR4 and a couple of Russian Rockets - 6N23P into the DAC and ..... Holy mother of god! The improvement was phenomenal. The entire frequency range became cleaner and clearer. The bass definition and control was amazing. Pianos and voices were ethereal with a huge sound stage. This is the closest to my vinyl turntable sound that I have ever heard from digital. The promise of digital is now within sight. I sat up til 2 AM grabbing CD after CD to see how it sounded now. And all this before any Modwright tweaking. Just wanted to say "thank you" for the deal. This is one of the best ever additions/revisions to my system and at a reasonable cost.