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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: GND schemePosted by N-set on: 1/14/2021
Paul, what I mean by 'Drain GND' is your idea of a GND cable connected at one end only. I have no access to mother earth and cannot install a dedicated rod. To avoid confusion, below is my actual power line and GND scheme.
As for the noise, I think there are two types:
1. Obvious - one that can be heard when there is no music; mostly due to GND loops, inappropriate shielding etc
2. Hidden - one that manifests itself in a musical material via various colorations
In my setting there is none to very little obvious noise depending on the chosen source. An exception is the Decca cartridge which picks EMT strobo lamp and motor noise, but that disappears almost to zero when I ground the TT (I lifted it in the previous location before I got the Decca, but consider grounding again to the household GND). All that is verified with very efficient Stax headphones.
When it comes to the more malicious hidden noise, I have little to choose to experiment. My only possibilities are A) no GND, when I get more obvious noise due to the cart pickup or B) connect to the apartment GND in various combinations. The one I use now is below, with the dedicated system GND and PP GND meeting the household GND only in the utility box, where GND enters the apartment. This is the best approximation I can make to completely separate grounds.
Edit: Just grounded the TT + its metal frame to the existing household GND (meets the dedicated grounds only at one common point at the apartment power entrance). Removed some of the obvious noise from the Decca cart. The feeling is also slightly increased the clarity of the musical presentation. Enjoying a surprisingly good RCA/German Erato Vivaldi's Dixit Dominus under Corboz 
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