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DT25 Head not responding

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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!

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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.

 

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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.

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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.

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