Originally Posted by
RothwellAudio
It's often accepted as irrefutable fact that a power supply in a separate box is automatically superior to a power supply in the main box. Not necessarily true. In fact, they're often inferior due to the regulators being located in the separate box rather than than close to the audio circuit where they should be.
However, with a phonostage it does make some sense to have the mains transformer well away from the audio circuit - possibly in a separate box - to minimise hum pickup from the transformer's magnetic field.