I notice that a simple ultra-low-noise regulator like this one (which eliminates virtually all traces of power supply noise) does not necessarily produce a super-stable output voltage without some form of negative feedback since the exact output voltage is highly dependent on the load. A larger load and the voltage drops. A smaller load and it rises. This means that if this regulator is regulating the supply of something like a preamp or other device sensitive to supply noise, nothing else should run of the same regulated supply, as that something else may not be a constant load and thereby produce noise in the power supply of the noise sensitive device.
