daddyopapa Posted April 27, 2013 Share Posted April 27, 2013 Trouble shooters listen up. I normally run my HD500 into a powered monitor via XLR cable. My home set up is in front of my laptop I use for recording. Always quiet with no interefernce. I also have tube amps that I play when the laptop is on. No interference. The other day I wanted to experiment with running the HD into a tube amp via 1/4" instrument cable. Got this weird interference like a UFO command centre. Didn't matter if the guitar was even plugged in so it's not the pickups. Turned off the computer and the sound went away. OK - it's the computer. Then I turned the computer back on - sound came back. Then I unpluuged the USB cable from the computer to the HD - sound went away. So the only time the interference happens is when I run 1'4 cable to a tube amp and have the computer on and the USB connected. Why? Quote Link to comment Share on other sites More sharing options...
silverhead Posted April 27, 2013 Share Posted April 27, 2013 I think this is caused by a ground loop between the HD and your computer when the usb is connected. This is quite common with a laptop. Just as a test, try running your laptop from the battery - disconnect its power supply from the wall. The noise should disappear. If so, a permanent solution would be to buy a hum-remover device. I forget exactly what they are called. Quote Link to comment Share on other sites More sharing options...
SiCantwell Posted April 28, 2013 Share Posted April 28, 2013 I get a pronounced hum when I'm connected to my desktop via USB and my tube amp via 1/4-inch. But Fender amps hum a lot, so it really doesn't bother me. I never hear it when I'm playing. Quote Link to comment Share on other sites More sharing options...
daddyopapa Posted April 28, 2013 Author Share Posted April 28, 2013 I get a pronounced hum when I'm connected to my desktop via USB and my tube amp via 1/4-inch. But Fender amps hum a lot, so it really doesn't bother me. I never hear it when I'm playing. It's not just a ground loop hum, it's the actual signals coming off the computer. Beeps, blips, morse code sounds, oscillations. Quote Link to comment Share on other sites More sharing options...
toneman2121 Posted April 29, 2013 Share Posted April 29, 2013 have you looked at this document? http://line6.com/support/community/support/computer_based/computer_audio_set_up_and_troubleshooting_ Quote Link to comment Share on other sites More sharing options...
Triryche Posted April 29, 2013 Share Posted April 29, 2013 Do you have a choke on your USB cable? Quote Link to comment Share on other sites More sharing options...
Akeron Posted May 2, 2013 Share Posted May 2, 2013 It's not just a ground loop hum, it's the actual signals coming off the computer. Beeps, blips, morse code sounds, oscillations. Talking about "morse code sounds" (mine were more like an old modem connecting but I think it's the same) I had the same problem and moving away from the monitor, with USB cable still connected to pc, solved that completely. Maybe this could be interesting http://www.fms-corp.com/resources_articles_computerservice.php4 Quote Link to comment Share on other sites More sharing options...
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