Salas SSLV1.3 UltraBiB shunt regulator

yes, not suitable for this case. It is also exists thread for "Salas low voltage shunt regulator" https://www.diyaudio.com/community/threads/the-simplistic-salas-low-voltage-shunt-regulator.143693/ . In sum: what you suggested for powering chips or R2R dac boards with such low voltage? May be it is important shunt with low impedance on wide range of frequencies.

I used Salas refektor for lower voltages on mine.
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Those are reg chips so its flat DC not raw DC they provide. Essentially you plan them as pre-regs.

No problem with the concept unless there's chance of some bad interaction with the CCSed shunt after-regs loaded. Oscillations we can't predict.

The pre-regs have feedback they are active. Objectively the rail lines in such a system should be checking calm on the oscilloscope.

Subjectively its interesting to try either (raw dc vs pre-reg dc) on one and decide. To see if less is more in this case.
 
Why I ask - Andrea Ciuffoli likes to use LDOs before shunt with low impedance http://www.audiodesignguide.com/DAC32/index2.html, LT1963. In next DAC he used LT1117 http://www.audiodesignguide.com/DACES9038PRO/index.html. His ES9018 DAC sounds marvelous.
Perhaps LDOs is not bad. Let's think positive and there are no oscillations issues. Maybe LDOs will do good job: stabalize DC power in rude way, but shunt regs after them will do it more precise, more accurate and LDOs will help because there will be not big gasp in voltage during power consumtion and then it will be easier work for shunt.
Then the question is which LDOs is best: more fast or more precise.
 
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