If you are preparing a problem solving kit I strongly suggest a couple of diecast boxes each containing an OEP Z3003E 10k:10k input transformer.
Not only will these break earths but have an interwinding screen that is very good proof against RFI. Use as close to the "recieving" kit as possible and connect via a hefty braid and foil screened cable.
Canford Audio stock them.
Dave.
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