Well,
I have finally sorted my little aluminium box around the Haufe T-7883 transformer capsules that someone said on another thread are the heart of the Auditorium 23. I have never heard the Auditorium, only having ever used my AT-650 on its 40 ohm setting with my 103Pro and after a tantalising but stuttering start (hum and radio breakthrough, now solved) all I can say is that with my 103Pro in my brass weighted Ittok LV111 it pisses all over my NOS AT. Cymbals shimmer like never before and vocals are much clearer, I dunno, but something like when you finally home in on a radio station after having been just a bit off the exact tuning frequency - you know, the same but different. Bass lines are much more agile yet easier to follow and the whole stage has also just widened up.
I have read on Vinyl Asylum that this sort (in my case) of DIY lash-up can take up to 200 hours to run in so at my rate I´ll let you know more in about 3 months´time.
Chris