I saw my isotek reviewed elsewhere (Not allowed to post it here)
But it made clear improvements to a Musical Fidelity 500 amp (very VERY good amp with monoblocks inside)
As for mains leads ~ the braided type have been 'measured' to lessen RFI (Same as a conditioner)
Armoured and braided will also prevent some EMI from entering them
RFI AND EMI have been 'measured' to effect amps
But it made clear improvements to a Musical Fidelity 500 amp (very VERY good amp with monoblocks inside)
As for mains leads ~ the braided type have been 'measured' to lessen RFI (Same as a conditioner)
Armoured and braided will also prevent some EMI from entering them
RFI AND EMI have been 'measured' to effect amps