Thanks to Matthieu (Malefoda) for the heads up on this. It looks distinctly like a DAC inspired by the DAC-AH - note not only the 8 DAC chips but also the PCB layout closely follows that design's. The price on Taobao is about half the AH (368rmb) so I shall be ordering up one or more to have a play. Matthieu found it on another website with prices in USD, here - http://www.cart100.com/Product/42124644877/.
Note there are two options here (blue, black) - the cheaper one is a kit of parts I believe, the more expensive ($84) the finished unit. Going on the translation of the Taobao page, the kit does not include the transformers, mains switch or the case.
Update : here's the summary of the mods so far, for details go to Malefoda's thread linked in the comments.
1) Re-route the output ground so the opamp filtering caps aren't subject to injected CM noise from the destination component (amp or pre).
2) Reduce the supply voltage to the output opamps...