Quote:
Originally Posted by Beardyman
... He won't entertain things like ... shielded mains leads ...
|
Outside the equipment's case I'm with him there. But I've dropped the 50Hz background hum in a customer's equipment by more than 10dB by replacing the mains lead
inside the box with a length of the screened stuff. It ran too close to the audio input wiring and the E-field pickup by the latter from the mains live conductor was what seemed to be causing the problem. It was a US piece of kit with the mains transformer primary split so it could be wired for 115V or 230V. I fear the manufacturer hadn't spent much time testing it at 230V.
Cheers,
GJ