I guess my big question was why a PS1 needed to be upgraded. :-)
As a hobbyist though you may have a lot more fun/success if you built your own linear power supplies. A good pi filter and regulators can do marvels for noise.
How to Modify SMPS Output Voltage
I’ve got a number of iFi iPower and iPowerX power supplies with factory set voltages of 5V, 12, and 15V. I’m tying to power two devices that require 3.6V and 7.6V. Currently I am using some cheap store bought voltage regulators to take the iFi 12V power supplies down to the desired voltages. I got to thinking that if I could modify the iFi output voltages to the desired voltages, then I wouldn’t need the cheap voltage regulators - fewer lower quality devices in the power chain should improve sound quality. Does anyone know how to do this? I contacted iFi and they said their devices aren’t adjustable nor will they sell me custom voltage units. On some power supplies, it’s as easy as opening the device and adjusting a pot. In other cases, you can switch out a resistor to modify the voltage. I’m okay with voiding the warranty. Does anyone know if this can be done and if so, how to do it? Thank you.