Not a good thing to put your sensitive preamp circuitry in close proximity to the power supplies for both the preamp and power amp.
One of my preamps has a separate power supply that is connected to the rest of the circuitry by special umbilical line - they recommend separating the two by at least a shelf or two in a normal stereo rack. The power supply also functions to provide power to other components.
Certainly an over the top approach, but that reflects thinking at that time on the topic.
https://www.youtube.com/watch?v=-cXCFfec5mI
The power amp it plugs into is also pretty extreme
https://www.youtube.com/watch?v=RE5nlQ9LPYY
One of my preamps has a separate power supply that is connected to the rest of the circuitry by special umbilical line - they recommend separating the two by at least a shelf or two in a normal stereo rack. The power supply also functions to provide power to other components.
Certainly an over the top approach, but that reflects thinking at that time on the topic.
https://www.youtube.com/watch?v=-cXCFfec5mI
The power amp it plugs into is also pretty extreme
https://www.youtube.com/watch?v=RE5nlQ9LPYY