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Up to Discussions in DT50/DT25
918 Views 7 Replies Latest reply: Aug 4, 2011 9:15 PM by goblush RSS
goblush Just Startin'
goblush
2 posts since
Jul 21, 2011
Currently Being Moderated

Jul 21, 2011 10:33 AM

DT50 appears to be defective

I just received my new DT50 112 and there appears to be only a hum coming from the speaker. 

 

Is there another switch somewhere on the unit that I need to set, or is there perhaps a master reset?

  • Nick_Mattocks Best of the Best
    Nick_Mattocks
    9,065 posts since
    Mar 26, 2007
    Currently Being Moderated
    Jul 21, 2011 1:15 PM (in response to goblush)
    Re: DT50 appears to be defective

    Check that all the tubes are correctly seated.  It may be something else of course, but after a long journey tubes can work loose and even fall out.  There should be two smaller 12AX7 tubes and two bigger EL34 tubes.

     

    Try that for starters.

  • Paoloadriani Just Startin'
    Paoloadriani
    3 posts since
    Jun 1, 2011
    Currently Being Moderated
    Jul 22, 2011 12:07 AM (in response to goblush)
    Re: DT50 appears to be defective

    Hi,

    I replaced the pre amp tubes, the 12xa7, I put two new tubes, always Electro Harmonix. Now the noise is gone.

    
    • Rowbi Expert Line 6 User
      Rowbi
      7,745 posts since
      Nov 25, 2006
      Currently Being Moderated
      Jul 22, 2011 12:52 AM (in response to Paoloadriani)
      Re: DT50 appears to be defective

      i think the OP is saying he only gets a hum and no guitar sound through the amp...  that's different to having a background hum behind the guitar tone, so initially replacing the tubes for EHX may not fix it.... unless of course the fault happens to be a defective preamp tube.

       

      for now I'd stick with the stock tubes and see if they need re-seating like Nick said...  but of course there's nothing wrong, once you're sure the amp is ok, with putting in new tubes.  I got a really good matched pair of Svetlana WInged C EL34's and then a couple of Harma 12AX7's from Watford valves...  having well matched power tubes, and a well balanced PI tube is essential for low noise.

  • merman_96 Just Startin'
    merman_96
    34 posts since
    Feb 12, 2007
    Currently Being Moderated
    Jul 22, 2011 6:42 AM (in response to goblush)
    Re: DT50 appears to be defective

    I have had issues with my DT-50, although it is perfect now. I assume you have checked that it is not on Standby? With tube amps, it is a good practice to have amp on standby when turning power on, and letting tubes warm up for a few minutes , making sure master volume is at lower level, before switching standby off.

     

    If that isnt the issue, is Master volume, up, channel volume up, guitar volume up ?

     

    If still no signal, are you able to switch between channels, switch topographies ?

     

    We have all made obvious mistakes, so dont feel embarrassed.

     

    Hope all is well.

  • Kneehow UberGuru
    Kneehow
    6,750 posts since
    Dec 26, 2007
    Currently Being Moderated
    Jul 22, 2011 2:08 PM (in response to goblush)
    Re: RE: DT50 appears to be defective

    Several of our Experts have already suggested checking the seating of the preamp and power tubes in your DT50.

     

    Were you able to try this to see if those suggestions corrected your issue?

     

    If this didn't you should get your amp back to the dealer so that a service technician there in Germany can diagnose the root cause of your amp's issue.

  • GibsonSG0005 Just Startin'
    GibsonSG0005
    31 posts since
    Nov 3, 2010
    Currently Being Moderated
    Jul 23, 2011 9:30 AM (in response to goblush)
    Re: DT50 appears to be defective

    I'm sure you've already done so, but as a precaution... Did you turn on both the Power Switch and the Standby Switch next to it?

  • goblush Just Startin'
    goblush
    2 posts since
    Jul 21, 2011
    Currently Being Moderated
    Aug 4, 2011 9:15 PM (in response to goblush)
    Re: DT50 appears to be defective

    Thanks for all the great responses!  I did not reseat the tubes, but just decided to return the amp to the dealer, who tested it and found no problems with it.  Here is the tchnician's responses:

     

    We just tried your Line 6 Amp, and is working perfectly, so we didn't understand your return. I'm just making a video to shwo you that all is working goodly. Can you phone us again. I'm just wondering, were you aware that on this sort of amp, you need to set the medium/high/bass volume high to have a sound, like on the fender amps. sincerly yann

    I had thought that I had set the other controls all the way up, but perhaps not.  In any case, it is being returned to me.  I am not so egotistical to deny that it may have been user error, as this is my first tube amp.

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