And look at that, he’s still going and using I think an R2R d/a conversion still, the one AMR also uses in their DP-777 dac the TDA1305 which was originally made by Philips for Discman use!!!! for it’s low power consumption I believe.
https://www.ebay.com/itm/DAC-kit-TDA1305-TDA1315-Multi-input-USB-Optical-Coaxial/322891865956?hash=i...
Cheers George