I've clearly done something wrong.
There is a constant hum/buzz that is loud, almost as loud as signal. I have isolated the ouputs from both phono amp, and the line amp and both have the same noise.
In the instructions for the power supply, it says " a pair of wires about 6" long connected to the two holes marked 120vac" I'm assuming that this means one of these wires connects to one prong of the plug and the other wire connects to the other prong via the power switch? In the supplied diagram of old and new wiring i see two wires going through a hole, one for each side of the outlet. Are those the wires mentioned above?
any other advice would be helpful. It seems to be an issue with grounding or the power supply...