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drdna wrote :

"...What was more concerning is today some 60 Hz hum also re-emerged in the system... As everything is plugged into the PP2000, I am not sure how to deal with it..."

Before opening up AC outlets and breaker boxes, here's a way of disconnecting the "ground" wire, and doing a quick test.

This is one of the big old power cords from PS Audio, which used to have a nice feature allowing a quick disconnect of the "ground" wire.

Unplugging the connector disconnects the cable and whatever component it supplies from "ground". You can then of course connect a test cable at one end to that same connector, and at the other end to the nearest water or drain pipe.

If you are even remotely capable with a pair of wire strippers and a soldering iron, its a very simple matter to make a test cable with this same feature. Just modify one of the common cheapo power cords that come with most audio components (you can also buy them at computer supply shops, as they are used for the power supply of computers). Use one with the fattest section you can find.

In your case, because everything is going through the PP2000, you have only one AC outlet to consider ; the one supplying the PP2000.

BTW, here's the way PS Audio now do it... Looks a lot more slick, but not as handy for connecting to the nearest water pipe :



Best of luck.

jd*

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