ProtoDAC TDA1387 X8 project

[hifinet]

Continuing off topic. The following is my two cent opinion. Looking at a clearer CAT SL1 schematic, it is using LM317 voltage regulation and constant current sources. You can first try a Maida LM317 regulator on the mu follower, and see what you think. I think you could probably run the mu follower stage and 6DJ8 cathode follower stage for both channels with one Maida regulator. CCS could be added later.

If the source of the line stage is a DAC and Moode, I think you can omit the 12AU7, because I think it is only there so that the line stage is noninverting. With Moode it is easy to digitally invert polarity if needed (thank you, Tim). The 12AU7 is not a very good sounding tube. Some of the mods substitute and redesign for a 6CG7, which is much better sounding. I think just get rid of the 12AU7 stage.