Occasional hum

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.

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Originally Posted by CageyH

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.

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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.

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.