Getting emails on who to buy tubes from for the TubeDAC-11, we don't sell them. I get mine either from 'wolfbane' who posts here or our tech Greg 'The Radio Guy'
http://www.theradioguy.ca/index.php . They both seem to have a decent but limited supply, wolfbane does this for fun, but as you can tell from his posts knows what is sounding good in the TubeDAC-11.
There are lots of reputable NOS/UOS tube sellers out there, if you see them dumping on Chinese tubes, then I suggest they don't have a clue/ears/experience etc
and move on. We see lots of these tubes that customers have brought in for testing, generally they test as described, but not always.
Personally I'll only spend pocket change for a tube on eBay and have had good results that way, looking for used 'lots' can also be fun as you get a variety to choose from, but hey don't bid too much, I might be bidding on it too
Feel welcome to post links in this thread to where you got your TubeDAC-11 6922, 6DJ8, ECC88, CCa, 6N23 tubes from and if it was a good experience or not, if not please don't dump, just say not recommended.
Cheers,
Ian