So I think this has been mentioned already here but it seems there's another revision to the power/transformer(?) module in the TUR-06. I met Shikada-san at the Fujiya show this past weekend and he mentioned to me about sending mine back in for the upgrade. (Un?)fortunately he's really busy so he won't be able take mine in till a few months later to do the upgrade.
I didn't get to try the difference in SQ to the power module between the old and new so I can't say what difference it makes but I absolutely love Shikada-san's post sales support. A true honest and pleasant man to deal with.