2. amps-preamps
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Strange ground loop...?

Hey,

I just hooked up a new amp and I'm having a strange noise issue. Only in my right channel, I get this high-pitched whine... maybe around 2khz. My left channel is dead silent.

The problem seems to be an interaction between my DAC and my amp. If the DAC is off, the amp is silent.

The amp is an 84' yamaha, so the cord has no ground. There is a ground screw, though, and I have connected that to my power conditioner, hoping this would solve it... nope.

I've tried plugging the amp straight into the same outlet that the power conditioner is plugged into (into which the DAC is plugged in). That actually did work... but I don't want to run my amp straight into the wall.

I suspect I just need to find a proper place to run that ground wire...

Any ideas?
djembeplay
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djembeplay OP
179 posts
 
Ya, in that early post I had thought that going straight into the wall had worked. It ended up that it repressed the noise quite a bit, but the distortion of lower frequencies was still there and the high-pitched whining had turned into a static 'fuzzy' background.

I'm going to go try some old cheap interconnects I have laying around real quick. I'll report back.
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kijanki's avatar
kijanki
4,433 posts
 
Bob - It makes sense, but why reversing interconnects makes difference? If it's BlueJeans then it's grounded on both ends and reversing it would not make any difference. He says that in one configuration of ICs noise is gone.

Why is it only in one channel - ground loop should affect both channels. Something is fishy here. Could it be defective cable? He mentioned that switching to Monster Cables eliminated noise completely.
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