NAD 3020 buzzing noise

patrick_l · Feb 27, 2015

Suddenly when I turned this amp on, there were strange buzzing sound in speakers. It is there even with volume knob set to minimum.
I changed filter capacitors, but problem still exist. Some people say it is due to bad power switch, some say it is about two X2 capacitors at the main switch.
Anyone had same experience?

c.coyle · Feb 27, 2015

What's the frequency?

If it's the power switch arcing, bypassing it with a jumper will tell you.

Do you hear it through headphones? If not, your speaker wires could be acting as antennae and picking up some radiation from somewhere.

Is the unit closed up, or are the top and/or bottom covers off?

I had this problem with a triac power switch mod. Closing the unit up eliminated it.

patrick_l · Feb 27, 2015

c.coyle said:
What's the frequency?

If it's the power switch arcing, bypassing it with a jumper will tell you.

Do you hear it through headphones? If not, your speaker wires could be acting as antennae and picking up some radiation from somewhere.

Is the unit closed up, or are the top and/or bottom covers off?

I had this problem with a triac power switch mod. Closing the unit up eliminated it.

Problem solved! It was one of the reservoir capacitors in pre-amp section

NAD is back in business again :banana:

Thank you for assistance.

NAD 3020 buzzing noise

patrick_l

Active Member

c.coyle

Fighting the Dunning-Kruger effect.

patrick_l

Active Member

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