No, afraid the ZBOX doesn't use the 6DJ8/6922 type of tube. It uses 12AU7 and variants. . . 12AU7, 5963, 6189 and others (and these have European names as well). Steve will send you a really nice, well-tested and balanced and matched in all sections tube with the ZBOX. (I've learned to treasure all the tubes that Steve sends with his components, they are truly "all that they can be" through his attention to testing detail and careful selection).
Here's a good page with info about the different 12AU7 types:
http://www.audiotubes.com/12au7.htmI haven't bought tubes from Brent Jesse (I mostly buy from eBay) but there's interesting info here about the differing types.