... a 3ft length of 12mm copper pipe which we bury in the ground outside. ... quality earthing....
What is the impedance to earth of that part of the circuit? Ten ohms? Thirty? More? What is the impedance of the mains earth provided by the electricity supply?
Give those new cables and sockets a few more days to burn in before making a final judgement axis....
I would have thought the real gain would be to get the hifi onto its own RING main, without any other kit on it like refrigerators.
Don't go for a ring, a dedicated circuit with bigger gauge cable is better IME.
Good to know Rob
Sounds like a worthwhile upgrade
Would there be some degredation over time with tarnishing of the copper pipe??
Might it be worthwhile to replace the pipe every few years?
Probably a bit extreme, just curious