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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: More options...Posted by Romy the Cat on: 2/21/2009
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 drdna wrote:
No, when the PP2000 is totally unplugged from the wall (and hence the neutral path which is also grounded is removed), the hum disappears. Then the whole stereo is functioning like some giant battery operated device. This is odd, since it seems to be the AC mains connection that is leading to hum. There is only one path to ground at that point, the neutral path through the AC plug. Is it possible that there is a ground loop problem within the PP2000 creating the hum, which is eliminated when there is no external reference to ground? Or what do you suggest?
I still have no idea what the isolation transformer that you mention does in your system. What I would do next is to lift ground ay the 2000PP input – and then ground the PP2000 to your own ground. Make sure that no other devises on your playback use the main’s ground. When you do so let me know how much AC voltage you have between neutral and ground. BTW, do not open the 2000PP in search of grounds – the unit has other “grounds” internally that are under voltage.
 drdna wrote:
There is only one path to ground at that point, the neutral path through the AC plug.
 
But if you lift the PP2000 output then the path is not thereanymore!!!

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