R2R is not the most important spec for a dac, I have found out.
Agree, SD DACs can be very good as well
but it can’t match a well designed tube output stage
This could be if you don’t have any other tube equipment in your chain, I personally think a tube has no business whatsoever within a DAC but that’s just my personal non professional opinion (tubes are a source of incoming RFI / EMI something you would like to avoid if possible inside a DAC)
My specific chain has a tube preamp and tube amps, I don’t really need a tube DAC but a good well implemented DAC
Many designers I respect have build these tube DACs, I know if fulfills a need but I don’t personally like it.
but I totally respect your opinion @redwoodaudio
EDIT: R2R's can be good as well and even tube DACs, it is all about the implementation