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Years ago someone (no names mentioned - but a purveyor of tweaky treats) added a grounding socket (linked to PE) to a 6 socket extension so that a length of wire could be attached to the casing of an amp or other piece of equipment. Would this have done anything?
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How are these 'grounding boxes' connected to the equipment whose performance they are supposed to improve? Are they connected to the metal casing, or are they connected to the outer signal-return of an RCA phono socket?
Barry
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They are connected to the return of an RCA connector and you are supposed to plug them into an unused socket on the back of your amp etc. They are supposed to be for signal ground, not mains ground/earth. Having said that, signal and mains ground are often connected within components - at least, in the UK they are...
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Does anyone here (Simon? Alan?) have a signal generator/analyser and oscilloscope that could be used to replicate the tests used in the article linked to earlier in this thread?
For example I have a Russ Andrews power purifier with its claritymains and zapparator modules that could be tested. There modules claim to purify mains, reject RFI etc.
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So if these boxes (and their connecting cables) act as inefficient antennae to RFI, the RFI will be injected into the audio circuitry on its way to the mains earth. The impedance will be low (not necessarily zero) so too will the injected currents. It is hard to see how these devices could have any effect.
Barry