Should my power supply buzz/hiss?

Soldato
Joined
11 Apr 2004
Posts
4,413
Got a Sony m2 and the power supply kept buzzing so took the power supply back and was given a supply from a z1 which worked fine. My earphones broke and I've been given a new phone but had to give the old one back along with the z1 power supply. On the new m2 the power supply is buzzing again. Is this normal or should I am for a new power supply?
 
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