Cambridge CXA80 humming sound?

[AudioJosh]

Hi, I have just found out my CXA80 is making a humming sound. I've isolated the unit (disconnected everything) and still getting the same issue. Tried different power leads and sockets but still getting the noise. I'm assuming it's the toroidal transformer as from what I understand it's common for them to hum but if I put my ear up against the top of the unit the sound is coming from the front with the transformer being in the middle. Hmm.

I can still just about hear it from a few feet away, a gentle hum nothing too annoying, but my girlfriend can hear it from 10 feet away! She was the first to notice. I don't have the best hearing but a bit concerning if my girfriend can hear it from that far away. Either that or she has the hearing of a cat.

Do any other CXA80 owners here experience the same issue?

Is it anything to worry about if it's audible from 10ft away? Not that I can hear it from that distance but I don't want to end up with a smokey! I was wondering if something might be loose inside the amp and if it's something I can fix, like tightening the transformer.

 

[terrys999]

Yes I had an hum on my cxa 80.

I could hear the hum from 10 feet away, it drove me crazy.
What I did was turn everything off , turn on the amp see if it’s still there.

My cxa 60 had an hum, I found out it was small night light on the oven in the kitchen.

Now with the cxa 80 it slid the tiny switch next to usb input ob cxa 80.
It removed ground. Cured mine.
You will find it’s an appliance in your house that causing it.

 

[AudioJosh]

Yes I had an hum on my cxa 80.

That's good to know Terry cheers. I've had no joy with the ground switch but I'll investigate further with any interferring household appliances. Failing that I'll take the amp round to another house and see if that changes anything I guess.

p.s., thought I'd say I've come across some of your posts about the CXA80. I also pair mine with an Arcam irDac II. A fabulous combo! I find the richer midrange of the DAC really helps. Good to know there is someone else out there enjoying it.

 

[terrys999]

You will find the hum is caused by something silly.
Sometimes the hum would vanish, that’s when I knew it’s an appliance causing it.
I love my irdac 2 the headphones sound very good, actually i compared it to my adi 2 dac fs, I can’t hear much difference .
Hope you find the culprit of the hum.

 

[3rdignis]

DC trap blocker filter for toroidal transformers - assembled in case - v.3 | eBay

Proposed DC trap (blocker, filter) will remove or at least lower the buzzing. - Ability for mounting 6 high current diodes 10A4 which rises theability for DC blocking to approx. 2.4V or standard high-current bridge rectifier with ability of DC blocking to approx.

www.ebay.co.uk

My offending appliance was the tv, which wasn't going anywhere.
So above unit solved 100%