Hum from amp and CD player

Posted by: Rotifer217 on 04 September 2017

I am curious to find out why I get transformer hum at a much higher volume at night compared with during the day.  During the day my Nait5i and CDX2 have minimal hum (you have to put your ear close to each to hear it).  However, at night, particularly later in the evening and the early hours of the morning it is a lot louder.  By morning the hum is back to it's low level.  This is a consistent pattern on a nightly basis.  There is never any hum through the speakers.  I'm not concerned about this as it doesn't have an audible effect when I'm listening to music, however I would be interested to hear views on why this occurs?

Posted on: 05 September 2017 by Ravenswood10
Timo posted:

Have a look at Isol-8's Powerline Axis -- fixed my evening transformer blues. Quite expensive though... It's without the mains conditioning that is so heavily disapproved here -- just fixes the DC offset. And once the hum is gone for a while, you forget about the price of the Isol-8... 

I went for the Axis a year of so back and no DC hum. Even if there is a marginal negative impact on SQ (and I've not detected anything) it's worth it just to banish the hum - it wasn't even in time with the music

Posted on: 05 September 2017 by David Hendon

Seeing all of this talk of electronic spider repellers reminds me of our next door neighbour who put an electronic cat repeller in her flower bed and was quite cross when she found one of our very large cats asleep just in front of it. She rang up the manufacturer who said that if it was a big cat, she had to set it to "dog".

(But that didn't work either..  

best

David

Posted on: 05 September 2017 by Ravenswood10

I'd heard that conckers work with spiders not sure how many you need and how fresh they need to be though

Posted on: 05 September 2017 by james n
Ravenswood10 posted:

I'd heard that conckers work with spiders not sure how many you need and how fresh they need to be though

Tried that. Didn't work 

Posted on: 05 September 2017 by Got Hi-Fi?

Emotiva CMX-2 will kill that hum, and doesn't affect your sound.

 

Posted on: 05 September 2017 by Huge
Got Hi-Fi? posted:

Emotiva CMX-2 will kill that hum, and doesn't affect your sound.

Not in the UK it won't.

Posted on: 05 September 2017 by Got Hi-Fi?

Doh! .. you would think they would have done something about that by now. 

Posted on: 05 September 2017 by Stephen Tate

Hi,

I have found that hair straighteners can be quite problematic as regards to causing the transformers to hum on my Si series combo, not that  I use them of course (the straighteners that is)

Still, at least they're on for only brief periods and not really a problem and trying to suggest to my wife into having a perm will be extremely frowned upon, so i'll leave it there.

 

Posted on: 05 September 2017 by joerand

@Rotifer217,

All this talk of spiders. Bigger question for me being that it is summer and you're using an electric blanket. Are you in Arctic clines or the Southern Hemisphere?

Posted on: 05 September 2017 by winkyincanada
Huge posted:
Hungryhalibut posted:

Hilary hates spiders. Can you recommend a spider deterrent that works? As it's September they will be getting ready to invade...

Hanging a big hairy plastic one inside the front door is usually a good deterrent to arachnophobes.

Oh, hang on a minute, you actually want to deter the spiders not the arachnophobe!  .

I don't know about spiders, but our tiger-repelling rock in the front garden has been 100% effective. Highly recommended.

Posted on: 05 September 2017 by joerand

While I wouldn't call the hose attachment on my vacuum cleaner a deterrent to spiders, it's a 100% effective means of elimination.