Dear @billwojo : Yes, Tamura transformers are second to none. Today SUTs using Tamura transformers comes with an over 1K price tag.
The ones used in the AU-1000 were customer made and exclusively for Denon. The 1000 has a FR: 5hz-200khz and weigths over 12 kg. I still own it, this is really the State of the Art in SUTs. Nothing less.
R.