60Hz hum


Hello,

I have a 60Hz hum and I don't know what to do. I must admit that I am dumber than dumb and I know nothing about nothing so my knowledge is very limited here but I did read about It and tried a few things to, alas, no avail.

A bit of context: My system have been playing for a good 7-8 years without any problem but a few days ago I moved furnitures around and did a bit of cleaning and before disconnecting everything I heard a hum in my speakers that I never heard before. How long is/was the hum present I don't know but my room is fairly small and the system is always on yet not always playing because It is my living/audio/TV room all on one. I am pretty sure I would have heard It by now but I didn't so... Bottom line, not sure since when the hum is there.

Once I cleaned up everything and connect everything back on to exactly the same set up as before the hum is still there. What I did so far is connect/disconnect one component at the time and tried to isolate everything. 

In the end I'd say the hum is coming from the integrated. I disconnected from the power bar, I tried direct to outlet, I changed outlet, I changed outlet with and without the power bar, I even changed room and outlet with the integrated and speakers. I tried left speaker, I tried right speaker, I did tried 2 different speaker cables. Hum hum hum... So I don't think Its neither the speakers nor the speakers cable. My logic tells me that It has to be the integrated. 

Where do I go from here? Is my integrated broken? What do I do now?

Any help would be appreciated.

Thanks!

NAD C315BEE integrated
Totem Arro speakers
Blue Jeans Cable BJC Ten White speakers cable
Monster Cable power bar







simon45
@ simon45

Look at the plug on the end of the power cord of the NAD C315BEE. I believe it is a 2 wire 2 blade plug. Correct? No equipment ground pin. The unit has double insulated AC mains power wiring. Class II wiring.
https://www.crutchfield.com/S-OVXHs39hsLQ/p_745C315BEE/NAD-C-315BEE.html#&gid=1&pid=2

Just a guess the hum you are hearing is not a 60Hz hum. It is not a ground loop hum.


Does the hum sound like this?
https://www.youtube.com/watch?v=pf-vULfjYK8

Jim

@jea48

Oh man...

When googling it, I came across the PS Audio website and the 120Hz test there is much higher pitched... Mine sounded more like the 60Hz...

https://www.psaudio.com/ps_how/how-to-find-and-fix-hum/

But now your youtube link sounds like the hum I am getting and similar to the 60Hz of the PS Audio link...

So yes, based on your link, my hum sounds like that.

And yes, the NAD has a 2 blade plug.

I don’t know what all this means but... thanks to you, I was most probably wrong with the correct hum in the first place.

Are the troubleshooting the same for 120Hz?

Thank you Monsieur!


@jea48 

From the same youtube link you gave me I looked up 60 Hz test tone and my hum is definitely a 120 Hz hum...

Apologies to all.

Or a bad diode jea
Simon, I think you are absolutely right. Your integrated needs to be sent in for service. I would send it in to NAD. Or, you can dump it and get something new. 

Mike