Question about NAD C350 2-Channel Amplifier

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NAD C350 stuck on "auxiliary" input

These are electronic switches - but any time I switch from AUX to one of the other inputs, it immediately switches back to AUX. If I hold the button down for one of the other inputs, sound is fine.

Complicating factor: this is a UK C350 that I have been using both in the US with a transformer and overseas. Just back from Europe again, this problem cropped up about 30 mins after reinstalling the amplifier with a transformer that I have used successfully in the past. None of the other 220v units that are running off of this transformer seem to have a problem.

Could this be a blown fuse or a broken connector?

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Re: NAD C350 stuck on "auxiliary" input


I have noticed that this nad c3xx series may have a general problem with the input switching chip. There are more post here on fixya where people have similar problems as you have.

For a few year ago, I repaired a fault that had close to the same symptoms, it was a cambridge azur xxx amplifier, in this cambridge it was a defect smd component that they used as a input multiplexer.

I look forward to repair this fault in the future. Nowadays i alway collect schematics and create repair e-books and/or repair movie guides in the fault finding process.

You can check out

;) /michael

Posted on Dec 21, 2007

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Hi There,

In a sound system there is an input selector switch which just connects the input socket you want to use to the "common" amplifier electronics inside...You say that the CD is fine so in this case it must be a faulty selector switch or broken copper tracks or wires inside the chassis electronics which connect those inputs.. through the selector switch to the amplifier circuitry.

The fault lies between the selector switch and the input sockets that dont work.....Not the CD one of course... thats fine..

Cheers From YUBEUT

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I have the same problem which started about a month ago and seems to be getting worse. I also noticed today, that 1 channel is significantly louder than the other - fault in the pre-amp stage, as feeding the power stage directly gives balanced, albeit extremely loud sound! Looking on eBay, I found someone else selling an amp with both problems. It would nice to think that NAD would acknowledge a design flaw, and fix for free, but my amp is 5 year old.

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