Office System Noise...???

[StereoNut]

I have a home office system comprised of the following:

Onkyo C-7030 CD player
Little Dot Mk.III Tube Headphone Amp as Pre-amp
BK ST-140 stereo amp
NHT Super One Bookshelf Speakers

I hear a really, really low "pip, pip, pip, pip..." sound out of the speakers.  It almost sounds like it's picking up some sort of a buffering noise from my Apple iMac computer, but I'm not sure.

How do I find it and then of course, how do I get rid of it!?!

Thanks!
Bill

[jimbones]

maybe the cd player? try a different source input to isolate it

[richidoo]

The preamp is probably picking up interference from some network device, cellphone or other appliance.

http://www.littledot.net/forum/viewtopic.php?t=597

It might be getting in on an unshielded cable?

[tmazz]

Start by disconnecting the pre from the B&K. If there is no noise then connect the pre with no inputs wired to it. If still no noise then re connect the source units one at a time until the nose returns. Once you figure out where the noise is coming from then we can talk about what can be done to get rid of it.

[sleepyguy24]

something like this happened with my office system too but it was a sizzling and crackling noise whenever my smartphone was near it. I handled it a couple of ways.

took a trip to ratchack and got some ferrite cores and put them around the wires power supplies of the preamp, turntable and the CDP.

Next up was preamp tubes. I put 2 orange ring dampers on each of the tubes.

After that was careful cable re-routing and migration of some isolation transformers.

A pain in the butt to do but it was worth it.