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  3. 1140008369

Eliminating RFI

Dear All
I am experiencing problems for the first time with RFI through my Singlepower headphone tube amp. I have concluded that it is due to an unclean power supply as I do not pick up this interference using a wall plug in another room in the apartment and as I have also swapped out power cables and interconnects in the room to no effect. Most of my equipment is UK 240 volts and I run the mains (Brazil 110 volts) through the transformer to the equipment - however, I have never experienced any problems with this equipment - but as the headphone amp is 110 volts I am running it directly through the Brazilian mains (without the transformer) and I am now having problems.
Does anyone have any suggestions for me to eliminate this interference? I need to keep all my gear in this room so moving it all to another room is not an option unfortunately.
Many thanks
James
vicks7

Showing 4 responses by vicks7

vicks7 OP
182 posts
 
Thanks - just what I have been looking for!!
vicks7 OP
182 posts
 
Thanks Bill.

The amp runs on 110 volts and my transformer is a step up transformer which I use with my UK 240 volt equipment so I cannor run the amp through this transformer.

I presume my step up transformer is also cleaning up the power as I have never experienced RFI with this gear, only when going through the Brazilian mains.

I may try this ERS material - where would be the best place to use it on the amp? By outlet box, do you mean where the mains is located at the wall socket? Would you just stick it around/over this wall socket?

As suggested I will also contact Singlepower.

Thanks again

James
vicks7 OP
182 posts
 
I have checked each and every outlet in this room and the same problem occurs. The problem also occurs in all the outlets in the room next door. I have tried unplugging all other devices, swapping interconnects and powerchords but to no avail. I am no expert on these things so what do I look for to determine if the outlet ground is connected?
vicks7 OP
182 posts
 
Unfortunately not, although I am starting to think it is also airborne. When I was adjustimg my speaker cable by taping it to the floor (to stop it hanging in the air) the RFI seemed to reduce in strength. So, with a CD, Amp and Speakers I get the RFI through the speakers and if I plug a headphone amp straight into the mains with nothing else other than a headphone cable I still get RFI. Very frustrating. I am auditioning some Audiopax gear at the weekend and I have asked the dealer to bring some power conditioners as well to see if this helps.
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