In article ,
N Cook wrote:
If the user-accessible part of the chassis is metal then that has to be
bonded to mains earth.
2 core is only allowed for double insulated kit in the UK.
Its not a quality of sound issue but a health and safety issue first and
foremost.

Not so. If the power supply and mains wiring etc within the amp conforms
to the standard there is no need to earth the metal chassis. Otherwise
every single metal cased amp etc would have the casing earthed and hum
loops would abound.

--
*Born free - taxed to death *

Dave Plowman London SW
To e-mail, change noise into sound.