Question about NAD C320 2-Channel Amplifier

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NAD spare parts

Hi I think the volume pot on my amp is faulty (lots of crackle when I turn it up or down, but not always in the same spot on the pot or all the time, prehaps it's something else??)

Where can I get a spare one?



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Hi steve,

i also looking for a potmeter alps 0651660-200kmn from kenwood 5010
hopefully you can help me

Posted on Mar 02, 2014

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Hi Steve,

Sometimes this soret of problem can be caused by a leaky coupling capacitor between stages. Check for a varying DC offset on the wiper pin of the vol control. A scope is best for seeing this, but a multimeter may also show you the problem, just compare one channel to the other to determine if there is actually a problem or not. Before replacement, try flooding the internals of the pot with CRC2-26 first. You can often resolve these issues in this manner. If it is a hermetically sealed type(ALPS), you may have to drill a small hole(I use a pin vice and a 1mm drill bit) to get access to the internals. Is always worth a try before replacement is done, and I have only had to actually replace a few Vol controls over the years as most are recoverable. Hope this helps. Any dramas dont hesitate to get back to me. A FixYa rating is a good reward for this tip to repair the unit. Cheers


Posted on Sep 19, 2008

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  • Graeme Ross
    Graeme Ross Sep 19, 2008

    Hi again Steve, just checking to see why you gave me a thanks for trying rating. I have a wealth of experience in repairing amps of all kinds. Can I answer any questions you may have is do you just wish to get a vol control.

    Best approach to spares always is to go to the distributor for NAD in your country. If you let me know the exact model of the Unit, and where you are in the world, I can follow up for you with part numbers and so on to get your spare part. I strongly suggest you follow the cleaning/relube procedure suggested in my first post. A fixya rating is a great reward for my time to offer you advice. Cheers mate.


  • Graeme Ross
    Graeme Ross Sep 20, 2008

    Hi steve, just following up with you.

    cheers mate


  • Graeme Ross
    Graeme Ross Sep 22, 2008

    Hi again steve, still waiting for any info back on that model number. I have a box of spares left over from when I was a NAD service agent. May even have the part you require.


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NAD spare parts

Hi....sounds like dirt or pitting on the carbon tracks in the pot.

The cheap solution is to USE it....often the carbon /graphite tracks will re-whet when rubbed by the wiper in the pot and hey it's ok until next year ....BUT............I mean do this....

Turn off the power and rotate the volume knob appx 100-200 times back and forth...........power up and check.
Use low continuous frequencies (synth music?) if possible as the lower the frequency is, the nearer it is to dc. and really exposes these faults easily.

Or spray WD40 (fix all graphite spray) into the pot while rotating.

OR get a genuine I guess

OR get an equivalent from your LHS is a good amp..........had one myself.......IT shook the Hi-Fi world by its' simplicity price and zero BS""t..........I knew the designer thru Dolby London where i was working man.


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Hi, i would try flooding trhe switch with CRC 2-26 for a start. Itr may recover some contact integrity. A jerry rig solution would be to bridge the switch contacts and leave it on all the time(i leave my amps running all the time) or if as in Australia you have a switch on the wall socket use that,

OR purchase a new switch from here. Not sure how you would go through NAD, probably dont have any in stock as a spare these days.

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best regards

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