I have heard the artemis in two different systems with a number of different SUT's. The one thing i would warn against is going for more than say a 1:10 step up ratio unless you have a really low output MC (AN IO-J). We listened to some 1:20's and some 1:26's on both a Miyabe and an Olympos and moving to a 1:13 was a revelation and made a noted improvement in the sound independent of transformer brand. The conclusion I came away with was that the higher step up ratios were dynamically overloading the inputs of the artemis and lowering that gain caused more sonic improvement than the specific brand of transformer.
dave
dave