High voltage stabilized PSU

[goneXC]

I know that the switch mode chips used here don't need a stabilized power supply (though in the AMp32 instructions it is stated that there are advantages to them). While there are high voltage LM317 chips available I cannot find an equivalent for the negative rail. How is this done?

[V-bro]

They are very rare indeed, you can solve this very easy by simply taking two isolated rectified voltages and place them in series and then use two positive regulators. I love the LM1084....(pin compatible with LM317 and will also fit on PSU1-VR)