Hello everyone -

I purchase a used Aphex Channel to experiment with and am experiencing noise as the unit warms up. I tried uploading an mp3 of the noise, or lack thereof, right after powering on and then one and two hours later. The upload failed, so below is a dropbox link to the audio file.

https://www.dropbox.com/s/rtr9ln83sg...ex%20Noise.mp3

I've swapped cables and inserted a different mic pre-amp and the noise went away. At this point I'm confident the noise is coming from the Aphex Channel or some interaction between it and the other components. Any ideas on troubleshooting this? I'm planning to contact Aphex on Tuesday.

In case it helps, here is a diagram of the current wiring setup.
https://www.dropbox.com/s/fdikwyk1u2...o%20Wiring.pdf

Thanks for any help.
- Oliver