curtlondon Posted August 24, 2017 Share Posted August 24, 2017 my DT25 head just cuts off and starts making a weird chirping sound. Almost like the sounds an old internet hookup/fax machine used to sound like. Makes the sounds even after I unplug the L6 XLR cable. It seemed to start failing when switching patches on my HD 500X. Got worse with my Helix. Help! Quote Link to comment Share on other sites More sharing options...
psarkissian Posted August 24, 2017 Share Posted August 24, 2017 Either vacuum tube (valve) microphonics, or a problem with the processor board (which will require servicing by a Line 6 authorized service center) on the amp. How old are the tubes in the amp? That is assuming that your L6 Link (110-Ohm) cable is an L6 Link cable and not a (50-Ohm) mic cable. Quote Link to comment Share on other sites More sharing options...
curtlondon Posted August 24, 2017 Author Share Posted August 24, 2017 Got the amp July 2016. There were a couple of instances at church when someone turned off power supply before I could properly shut it down. Hasn't worked 100% right in 6 months. I'll have to try the tubes first as shipping it to a dealer would be costly. I do use the recommended digital cable which I thought of replacing but the noises were still happening even after I pulled cable out and restarted amp. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted August 24, 2017 Share Posted August 24, 2017 If the tubes don't solve it, then it's more than likely what I suspect it is, and that requires an authorized service center who knows the product. Log a support ticket in your Line 6 account. If you replace the tubes, make certain they are the specified Electro-Harmonix versions. No JJ's, Mesas, Groove Tubes or Tung-Sols. These are hybrid (analog/digital) amps, and they are not forgiving of modifications. Use the specified Electro-Harmonix tubes. There should be something about that in the Knowledge Base. Quote Link to comment Share on other sites More sharing options...
curtlondon Posted August 24, 2017 Author Share Posted August 24, 2017 Greatly appreciate your help! Quote Link to comment Share on other sites More sharing options...
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