Phono mains hum

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ecosse_011172

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Equipment:
Origin Live Aurora Turntable
Tom Evans MicroGroove+ Phono Amp
MF A3CR Pre Amp
2 x MF A3CR Power Amp (bi-amping)
ProAc Response D15

I hear intermittent RFI hum when listening to the turntable, the flat seems to have lots of RFI (always clicks and stuff when lights are switched off) and I'm struggling to eliminate it.
I've played around with the earh wires on the phono amp and pre amp to no avail.

Any suggestions?
Are the IsoTek or Russ Andrews silencers worth a go?

Thanks
 
I remember a friend in a similar situation with his system. The RA silencers did nothing, but changing the lighting switches to new ones helped with the clicks along with putting some suppression caps across the L & N.

You need to find out what is causing the HUM first, then tackle it.

1. when did it start? when you first moved in?
2. could it be that the evans stage is too close to the motor supply etc.
 
robM said:
I remember a friend in a similar situation with his system. The RA silencers did nothing, but changing the lighting switches to new ones helped with the clicks along with putting some suppression caps across the L & N.

You need to find out what is causing the HUM first, then tackle it.

1. when did it start? when you first moved in?
2. could it be that the evans stage is too close to the motor supply etc.
Click to expand...

It has been since I moved in, it's a rented flat that the whole building was rewired and refitted just before I moved in.
 
After no joy whatsoever I sent the phono amp back to the manufacturer for test as unplugging every appliance in the house and changing cables, inputs etc. made no difference. Using the phono stage in my pre amp removed the hum using the same setup, cables etc.

The manufacturer has found no problems and cannot reproduce the problem but suggests replacing the voltage regulators with newer improved ones at a cost of over 400 quid which I can't afford at the moment.
I don't think I have any option but to get it back and sell it...:-(
 
I bought and tried one of the Partridge step up transformers being sold as the "Martha"by a fellow ZG/Wammer, as a potential replacement for my Denon AU-300LC.

I tried with numerous interconnects of varying length, tried to position it as far away from other kit as was possible within my set up, but I just could not stop the bugger from humming.

Sent it back and it worked perfectly in Laurance`s system with no discernable hum. Which is also backed up by the number of other successfull sales that have been acheived with this step up.

It seems to me that sometimes there is just no sane reason why a peice of kit interacts with other equipment. Although I am sure the electronics experts amongst us might have a different opinion. Maybe its just the SYNERGY thing coming into play again

My advise would be sell it and try something else from a different manufacturer
 
Andy 831 said:
I bought and tried one of the Partridge step up transformers being sold as the "Martha"by a fellow ZG/Wammer, as a potential replacement for my Denon AU-300LC.

I tried with numerous interconnects of varying length, tried to position it as far away from other kit as was possible within my set up, but I just could not stop the bugger from humming.

Sent it back and it worked perfectly in Laurance`s system with no discernable hum. Which is also backed up by the number of other successfull sales that have been acheived with this step up.

It seems to me that sometimes there is just no sane reason why a peice of kit interacts with other equipment. Although I am sure the electronics experts amongst us might have a different opinion. Maybe its just the SYNERGY thing coming into play again

My advise would be sell it and try something else from a different manufacturer
Click to expand...


Thanks, I think I'll def try to sell it, put soem cash to it and try one of the WHEST Phono amps...
 
If it is a ground loop then try attaching the ground wire from your turntable to different components and the use more cable to further the ground path. Connect from amp to other electronics in different patterns. It's trial end error to see which resolves the issue but you should get there in the end.

However, a ground loop is seldom evidenced by noise generated from external switches. If this is the case you may be better oiff with a mains conditioner.
 
henley said:
If it is a ground loop then try attaching the ground wire from your turntable to different components and the use more cable to further the ground path. Connect from amp to other electronics in different patterns. It's trial end error to see which resolves the issue but you should get there in the end.

However, a ground loop is seldom evidenced by noise generated from external switches. If this is the case you may be better oiff with a mains conditioner.
Click to expand...

Thanks a lot.
I'll see how I get on when I eventually get my amp back.
 
You can try moving your motor power supply as far from your phono as lead length will allow, or get your phono stage away from all other toroidal power supplies.
 

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