Rerurn to Romy the Cat's Site
In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: Again with the "Neutral" Explanation...Posted by Paul S on: 11/24/2011
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N-Set, why would you disconnect from the house neutral, unless you are using battery power??? This "neutral" is the "ground" leg of your circuit! The house neutral wire is typically white, and the house ground wire is typically green. The "extra", green, house "ground" wire is intended to be a safety leg, to ground any stray current or shorts. The problem for us is, the house "ground" is typically too noisy for audio, and it effectively winds up working more like an antenna than a real ground. Also, impedance, etc. tend to vary between the house neutral and ground, creating a reactive "noise generator".
I am not sure what I would do with all your shielding if I could not bleed/ground it separately (from the circuitry). Apartments and condos are typically the worst case scenerios, as far as ground noise. If you can trace your circuits back to a real, mechanical gound, try to find a quiet, separate, "un-broken" line to ground for your shields. It might be a quiet neutral leg of an un-used circuit that makes a "home run", such as a dedicated appliance circuit. This is sub-optimal, but it should help.
To damp mechanical vibration it actually sometimes helps to loosen very tight screws to a "critical" tightness.
BTW, are you telling me that a Gauss meter reads higher near a smaller transformer (vs, a larger one)?
Best regards,
Paul SRerurn to Romy the Cat's Site