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Arcam A65 with EMI driving me nuts…

Greetings Forumites, I am looking for ideas how I can defeat right channel EMI in my integrated Arcam A65. It seems to only be in the right channel. The left channel is dead quiet. The EMI does not get louder as I turn up the volume which leads me to believe EMI is coming in after the power stage.

I do not think it is an issue with my speakers as the EMI is present whichever speaker I plug into to the right channel. Also, same problem when I plug in headphones. The right channel has the EMI.

Removing the CD, or other sound sources has no effect. The EMI is still there. It does seem to decrease if I touch the chassis, but not completely. Maybe, there is some grounding problem involved, but the grounding (green wire) and wiring looks tight to me inside the chassis.

I love the amp and don’t want to get rid of it, but this EMI is ruining my sound. I have the service manual and I am handy with a soldering iron. I can easily replace a few caps etc. if need be.

Many thanks.

busk
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cleeds
5,655 posts
 

Something like EMI typically would affect both channels, so it's likely something else is the problem.

busk OP
2 posts
 

I really appreciate these responses. It is strange that the noise is in one channel only. I am clearly pulling in some FM radio broadcast as well as noise. I do have a dehummer plug between the outlet and the unit and a ferrite bead on the power cable to no avail. 

 

best.

fiesta75
1,378 posts
 

Have you determined if the noise is in the power amplifier section? I would agree that EMI would be in both channels.

busk OP
2 posts
 

I am guessing the interference is coming in in the power stage

at some point because the noise and radio signal does not get louder when I turn up the volume. Something appears to be acting as an antenna and pulling in that radio signal. Still strange it’s only in the right channel, headphones and also the SP2 right channel.

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