1) Pretty sure you'd find it cheaper to buy from here, they can build the kits for you on request:
Audio Note Kits - Welcome
2) I bought and built a Dac 2.1 Level B last year and was thoroughly unimpressed for the following reasons:
WRT the product as a kit:
- The circuit diagrams were out of date and the baggies contents were all jumbled (made life harder than it had to be).
WRT the product if you bought it constructed for you:
- I had terrible hum from my DAC when it was completed. None of my other hifi gear hums at all (including some cheap & $$$ stuff). I showed my work to a friend whose been an electronics and audio engineer for the past 30 years, and he said the design was pretty poor. Transformers lined up with their winding parallel to each other (instead of perpendicular), the tubes were microphonic and needed replacing (one to a lesser degree than the other so they weren't even matched), the REPLACEMENT tubes were also faulty (so the person who picked them was an idiot). My friend said I built it as good as it could be built according to the design, and even made a few hacks of his own which decreased the hum, but it was still more than ZERO which is what I expected from a product costing that much.
In the end I got a refund (but it took a long time of phone calls and me repeatedly stating that it was the design at fault), and parts of my DAC were sent onto someone else to use (hope they had better luck than me, I never heard back), but the fact remains that nothing else I have made the complete racket that DAC 2.1 did. I know ppl say tubes aren't as quiet as solid state, but this was a whole other level of noise it should't have made. It turned me off tubes completely.
It really made me wonder what the reviewers who love AN gear are listening to. From all the comments my engineering friend made, and the fact that he said all the parts were operating properly, combined with the horrible hum we heard, I wouldn't touch them with a 10 foot pole - especially considering the price! m2c