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Implications of imperfect grounds?

It's my understanding--never made the measurement, which isn't easy--that even a reasonably effective earth ground can have several ohms or more between it and true, ideal earth ground. So noise on the ground line isn't necessarily immediately sucked right down into the ground where it can't do any harm.

Also, it has been my experience--which admittedly is limited--that there are lots of houses out there with lots of receptacles that are not properly grounded. It seems to me that you would want your equipment to function reasonably (and be safe) even in such installations.

I wonder if someone (Dan? Charles?) can help me understand what, if any, are the implications of these two facts for designing audio electronics.

Any takers?

Thanks,
Jim

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