I have received a reply from him. He says that the website needs updating, as he does updates to all the Museatex dacs including the IDAT/M and IDAT-44.

Great to know, now the hard thing is to find one.

I had an upgraded Museatex Bitstream DAC and an original Museatex Bitstream DAC. The upgraded unit is gone, as I liked the original better, go figure. Just my five cents. Maybe it's because I don't like how blackgates sound I also like my custom made NOS CS1412/TDA1451A with ECC83/ECC88 class A output stage DAC a lot better.

Hahaha then, if you decide to sell it I call first dibs.

I had an upgraded Museatex Bitstream DAC and an original Museatex Bitstream DAC. The upgraded unit is gone, as I liked the original better, go figure. Just my five cents. Maybe it's because I don't like how blackgates sound I also like my custom made NOS CS1412/TDA1451A with ECC83/ECC88 class A output stage DAC a lot better.

Do you have the schematic for your tube DAC?

I have it somewhere, it's a very simple DAC. Here some pics: