I think there is some sort of suppressor you can get to plug your fridge into but I don't know what they are called.
Better to do it that way and fix at source rather than put a band aid on the system.
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I think there is some sort of suppressor you can get to plug your fridge into but I don't know what they are called.
Better to do it that way and fix at source rather than put a band aid on the system.
fridges etc usually give a click, not a hum
It could be the heat pump then. I will found out when summer comes, and the heating goes off.
Good point.Quote:
Originally Posted by struth
Do you think something like this https://www.atlhifi.com/shop/fully-a...mbled-in-case/ would do the trick?
looks well enough made and might work, but it is hit and miss as you still haven't isolated the issue yet kevin, and its not cheap.
your probably as well waiting until the heating is not getting much use and see if the hm is not as often. if thats case then you at least have to culprit. its always better treating the source rather than trying to block it after
There is no way I can change the heating. ;)
I am going to go and turn it off now the family has gone to bed and see if that is the culprit.
It is not the heating, so I have noise on the mains. It is not DC. It is not the power line network adapters.
I don’t think I will ever find out what it is.
Ground loop? Faulty equipment?
More than likely - easily achieved with the usual (un-balanced) connectivity.Quote:
Originally Posted by Macca
So how does the AG1500 fix the ground loop/faulty equipment?
The system is silent with the mains regenerator in place, which is more than can be said for the AG1500.
from what I can gather (and I don't really understand this) the transformer will suppress the mains components causing the hum but does not actually eliminate the ground loop.Quote:
Originally Posted by CageyH
you could try a band-stop filter...
https://en.wikipedia.org/wiki/Band-stop_filter
Thanks Grant. That looks interesting.
I think I have a temporary fix. I connect just the BB3 to the AG1500, so it is silent when I listen to vinyl.
This removes the occasional hum/buzz.
Edited to add:
I have a temporary fix, as what ever is causing the noise is not something I can turn off.
So my system is plugged in to the mains, with the exception of the phono stage.
The system is now silent, but I want to get rid of the AG1500 power regenerator, as I know this is throwing noise back into the mains
Can a ground loop be intermittent?
yup they can, especially if some big electrical unit is kicking in and altering the earth system. transformers will mask the issue but wont solve it obviously. being a french power system too may make it more difficult to track for non french if you know what i mean.
maybe a better mains tx system might be your best bet?
I have ordered an iFi AC Purifier to see what that does, and if it has a negative effect, I will send it back.
An isolation transformer could be a solution, but if this is a ground issue, I need to find it.
My concern is that this is due to all the smart meters that send data to EDF on the power network. Filters do exist, but they are relatively expensive.
I guess I need to trawl some French Hifi fora.
The only leads I have not swapped out in my system are TT to Phono.
I may try these tonight, but I still think it is mains related.
phono leads especially and phono stages can produce hum, often fields from power cables etc.
I think I may have cracked this. At long last, I hear you say.
My system has been on for an hour since I changed something. Before the change, I heard the buzz. Since the change, so far so good.
The culprit? A while ago I plugged a generic USB lead from my PC to my DAC, so I could do a direct comparison with and with out my Audio-GD DI2014 in the system. I left it plugged in, as I was lazy, and what harm could it do? I have removed that USB lead, and all I can hear now is a bit of valve hiss. No more Buzz every now and again….
I am (really) hoping this is my last post on this subject, but thought it may be useful to share my findings.
I guess I don’t need the iFi purifier now.
That is why I made some using a good quality coax cable, as advised by a respected phono stage designer.Quote:
Originally Posted by struth
you do get current spikes in the USB cable. The USB cable has resistance, a small voltage is induced between the USB audio device and ground at the other end of the USB cable. This isnt much, but devices like phonos only generate a few thousandths of a volt, so it's plenty of signal to cause havoc if it gets back into the preamps.
good youve got culprit...
I was just reading the other day about USB creating ground loops but I didn't think you were using one.
I forgot it was still plugged in, to be honest. I do have one going from my PC to the DI, but that is fine.
It turns out that the USB cable was not the culprit, even though I thought it was.
So, I bought an iFi iPurifier for the mains. It did nothing so I sent it back.
Next up are some ferrite chokes on the SE cables. So far, so good, but I need some more time listening.
It may still be there, but at a much lower level, which may be acceptable.
You need one of these Kevin, it will probably cure all your noise problems. I heard one here the other day it was totally gobsmacking but so is the price!:eek:
https://www.futureshop.co.uk/chord-p...caAnk-EALw_wcB
I'd bet money it wouldn't.Quote:
Originally Posted by Jimbo
:lol:Quote:
Originally Posted by Jimbo
For 7k, I could rewire my house, and if you change the cable on the Chord, you can add another 1.5k :rfl:
:lol:
Last night, and so far this morning, there is a very faint buzz. Almost like the RFI is trying to break through, but can’t quite manage.
It would seem that the culprit is RFI on the aerials, I mean interconnects, on the turntable leads, quite possibly just the earth wire.
Apart from a ferrite, how can I make it less susceptible to RFI?
It is a really thin cable and I have wrapped it round a ferrite I bought for my mains cable.
I am thinking of replacing it with a thicker wire, where I can clip a ferrite on properly. If I do this, I could also shield the cable, or use some RG306(?) coax for the Tt ground and leave the shield floating?
Faraday cage ? Not sure how you'd implement it but it would certainly work.
Worst case, I could have a fly lead going to mains earth, but the idea of a shielded grounding cable - :mental:
I think there is a mobile phone mast about 1km away. This could be the source, but I think I need to stop have an aerial between my TT and Phono-stage.
just get rid of the bloody TT altogether, more trouble than it's worth in more ways than one.
:lol:
That would certainly fix the issue.
It is a bit extreme though.
you're a die-hard mate, I will get you a bloodstained undershirt for Christmas.
Funny enough been reading of this same situation with newly-found hum on a few forums lately. All involving turntables. 5G roll-out to blame? Maybe.
It could well be.
I have just built a TT grounding cable with a floating shield. So far, so good, but it has only been plugged in for 10 minutes.
fingers crossed.
How will a completely floating shield help? It won't act as a Faraday cage.
If you want to use a screened cable, connect the screen at the source: the TT metalwork and leave it floating at the other end.
From a quick Google.
I had this argument with Richard Dunn, but I was arguing that a Faraday cage needed to be grounded. Apparently, it does not.Quote:
Does a faraday cage need to be grounded? Grounding a faraday cage — that is, providing a way for the electric charge from its exterior to exit — is important in terms of safety, but it is not necessary for a Faraday cage to operate. Without grounding, electric charge will remain in the exterior of a Faraday cage.
well it does electrocute if it isnt:lol:
An aircraft does not electrocute you, and that is an ungrounded faraday cage.
However, sometimes the simplest solutions are the best, and I don’t know why I did not think of this yesterday.
Just disconnect the grounding cable from the phono-stage….
difference potential i guess. cannot flow inward if there is no potential differenceQuote:
Originally Posted by CageyH
There is a podcast on noise and hub in this attached link, might be worth a listen?
https://parttimeaudiophile.com/2023/...n-your-system/
Did you listen to it?Quote:
Originally Posted by Jimbo
NahQuote:
Originally Posted by Macca
It's just some bloke from Audioquest flogging their tat. Infomercial. No real knowledge to be gained regrettably,Quote:
Originally Posted by Jimbo
To be honest I did start to listen but only got through first 5 mins. Just thought there might have been something in it for Kev?Quote:
Originally Posted by Macca
No the bloke's just a salesman not a technical expert.Quote:
Originally Posted by Jimbo