Question about NAD S300 Amplifier

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NAD S300 Amplifer humming

I just bought a used NAD S300 Amplifer.When It was power on,it was humming itself.The humming can be heard in 3m.Is the humming normal for the amp? or the amp got something wrong.The amp works order but humming.
Thanks.
Leo

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  • NAD Master
  • 5,056 Answers

You have either got a bad earth connection, or possibily there's a capacitor failed.
If you can't find a dodgy conection, I would replace the large Electrolytic Capacitors in the power section, they are used to take out 50hz hum in the mains electric, when they go you get that hum coming into your system.

Posted on Nov 18, 2009

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