Interest has developed lately for the ECP Audio/Beezar Walnut X DAC. My intent, if you will all allow, is to start this as a detailed build thread, similar to what I did with the T4 Headphone Amplifier. Posts with photos and detailed descriptions will be posted almost daily, once the actual build begins. Of course, I've sold all of my remaining stock - including one that I had intended to keep as my personal DAC. So, I was sort of forced into building more if I wanted to have one ... and I definitely do. So, I received further inquiries about more Walnut X DACs and asked the interested parties if they'd be willing to help with the initial investment by pre-ordering at 50% of the sales price. They did, so here we are. I'll be building 5 DACs, counting the personal one for me. Of course, the first thing I did was contact Doug Savitsky, the DAC's designer. Maybe some of you have heard of the DSHA-3F or T4? (Tongue in cheek, of course) Those of you who've invested in those amplifiers are well aware of Doug's achievement as probably one of the most pre-eminent headphone amplifier designers in our headphone culture. I personally think he's the best, but I'm obviously biased. Anyway, I contacted Doug because I needed more PCBs. Of course, the first thing Doug asked was whether I needed any changes. I said yes, because the RCA jacks were a tad too far back on the PCB, but that was it. Needless to say, I was very surprised to find out Doug included pads on the PCB for not only the sterling Lundahl line-level output transformers used before, but he also included pads for the top-of-the-line Lundahl, amorphous core transformers. So, prospective customers can choose either option. Remember, however, the amorphous core Lundahls are very much more expensive than the regular Lundahls, by over 3 times. Multiplied twice for stereo, that's quite a bit more money, or $1375 vs $1000 standard. I'll go into a bit more detail on the basics of the Walnut DAC as things go along, but suffice to say it incorporates an excellent Wolfson balanced DAC chip, asynchronous USB at 24-bit, 192kHz, beginning with a genuine Amanero USB board, and outputs through Doug's proprietary DSHA-like, fully differential amplification section, to the Lundahl line-level output transformers. The DAC itself is single-ended on the output, mainly because it was designed as the perfect complement to the T4. However, we understand that some have used it with the 3F with excellent results. Of course, it's perfectly suited for almost any other headphone amplifier or music source in a component stereo system. Here's some pics of the Walnut X.1 DAC: Details on the innards are as follows: The pic shows an Amanero clone board with which I had a dubious flirtation. We only use genuine Amanero boards anymore. More to come!