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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Pure Power Internal Ground FaultPosted by drdna on: 6/8/2014
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 Paul S wrote:
Perhaps the PP in the circuit raised the residual current on the neutral and/or ground line(s)? ...shielding might still help with "hum" if the shielding was grounded in a way that dropped ground resistance/residual current on the problematic line. This notion still supposes it's a "ground loop" problem; but it also "explains" the roles of the PP and the shielding in "causing" and "solving" a hum problem. 

Paul S
This is an interesting thought. It still comes back to there being a flaw in the construction of the PP units (but not the design, apparently since some units like Romy's did not have a problem).
 miab wrote:
Adrian, can you confirm whether you were using cable with shielding or without? Like you I had the buzzing go away when on battery or without PP2000 in system. It became dead silent. Then with PP2000 back in system there was buzzing. I went to all shielded cabling with PP2000 in system and it went silent again. I attributed it to ground loops not EMI.
Honestly, I cannot remember, because it has been a while since my PP2000 was "sent back for repairs." I make my own cables and wiring, and I avoid shielding unless it is needed for a specific purpose, then I add it. If I ever get the PP company to deliver on their many promises to ship me a replacement unit, I can certainly try this experiment.

Adrian

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