Question about NAD C370 2-Channel Amplifier

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NAD C370 Amplifier

When I switch the amp on it makes a loud buzzing sound that comes from within the amp itself and also comes though the speakers. It gradually fades away over a couple of minutes. What could be causing this? I have checked all my connections and everything seems fine.

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  • Anonymous Nov 22, 2008

    Hi I have had the same problem with my nad c370 a few times over the last eight years which was repaired under waranty the first two times, also on a second c370 I bought to bridge and use as a backup because Ive found the c370 so unreliable, It is the caps in the protection circuit. I was quoted £175 to have repaired through audio t. though I got it done for £60 in a local tv repair shop.

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  • 31 Answers

This sounds like a problem with the protection circuit, and/or the speaker relays. More specifically, a capacitor within those circuits that is not behaving properly. I strongly suggest having it looked at ASAP. 

Posted on Sep 17, 2008

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Posted on Jan 02, 2017

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IF YOU ARE NOT GETTING A LOUD POP WHEN THE MACHINE IS POWERED ON.......

1) Make sure that the wires on the terminals below are still connected to the screws. There is one ground and one each for left and right. The lower the tap the lower the (max) volume of the jukebox.If they are not connected there will be no sound.
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If you are getting the loud pop in the speakers when the power is turned on .....

Check the plug on the side of the mechanism, just below the back of the tone are.(looks like a little tube socket) Check to see that it is connected to the mech and the CORRECT PLACE on the amplifier. It mat be possible to have this end in the wrong place. bf77613e-82a3-4e37-b8fe-cc80f4d4dbcb.jpg

Check all all your connections against the pic.

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