I built this last night, using an Antek AS-1T300 power transformer, Hammond 156R choke, and James 6112HS outputs. The KT-88's are from EH, generic Russian 6SL7. Hundreds more amp pics at http://tmamps.com
I've never done an A/B comparison of James vs others, but they seem to have nice smoothness across the audio spectrum. The convenience of multiple impedances, good looks, and quick delivery make them appealing.