Thanks Jim, no I don't have any immediate need of the specs to match a different preamp to my AVA amp, or the other way around, but at some future point perhaps in years I might want to, and it would be nice to know. As for the other types of specs that's purely from an Audiophile interest point of view, which for myself at least is part of the fun of the hobby. I'm especially interested in the SN numbers, because listening to my gear the noise seems vanishingly low compared with previous brands I've owned, so naturally I'd like to see if what I hear bares any resemblance to what the numbers might be. In any event I'll take a look at the link you left, and hope AVA will consider adding specs in the future, possibly with educational explanations of what they do, or do not tell us, on this site, or maybe even in your literature. Thanks for the response.