Power supply noise - standby & when turned off

[knud0]

Hi,

just got my new Devialet 120 and found the following problem:

When not playing, or in standby or even if turned off the amp makes a permanent noise that
one can hear standing up to two meters away.

Is comparable to the noise of a mini hardisk running (e.g. in IPods classic) or the noise of
a cooling fan of a notebook.

Of course, neither a harddisk nor a cooling fan in built in! If a remove the amp from power, the
noise stops. So this has certainly to do with the power supply.

Is this normal? Do I have to worry about this? What can I do to minimize this noise?

Kind regards,

Knud