Diagnosing Deluxe Reverb Frequency Ringing and Distortion - Audio Clips

Discussion in 'Amp Tech Center' started by jondom22, May 13, 2019.

  1. jondom22

    jondom22 TDPRI Member

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    I've noticed recently that my ears have been very fatigued playing my deluxe reverb. After some investigation, I realized there is an upper midrange frequency ring around 2-3kHz. I poked around my tubes to test for microphonic tubes and performed the test with and without reverb, and on both channels.

    Additionally, when using a load box (suhr reactive load), I can hear what I assume might be subtle tube distortion even when playing the amp on "clean" levels (2 on the volume dial).

    Here's a clip of just ringing out some chords so you can hear. Any insights and tips are appreciated.

    Soundcloud Link
     
  2. gianluigi

    gianluigi TDPRI Member

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    Check and clean tube sockets if needed retension. It worked with my amp.

    Inviato dal mio LLD-L31 utilizzando Tapatalk
     
  3. robrob

    robrob Poster Extraordinaire Ad Free Member

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    Have you tried different tubes? A bad tube can cause your symptom.

    If it's not a bad tube then try chopsticking your socket leads around.
     
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  4. Axis29

    Axis29 Poster Extraordinaire Ad Free Member

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    Always start with the simplest test first... Which you did, by tapping the tubes. Next would be replacing the tubes one by one with known good ones, as Rob states.
     
  5. jondom22

    jondom22 TDPRI Member

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    Just experimented a bit more with rolling preamp tubes, taking the reverb tank out of the combo, tapping away at the tubes chassis, and sparying some E-Line tech spray on the tube pins to clean the sockets, and haven’t been successful at sourcing the high frequency ringing/resonance.
     
  6. robrob

    robrob Poster Extraordinaire Ad Free Member

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    Did you try other power tubes?
     
  7. jondom22

    jondom22 TDPRI Member

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    I did not as I didn't have any spares and I'm not experienced with biasing an amp. Takin it into the shop tmrw.
     
  8. robrob

    robrob Poster Extraordinaire Ad Free Member

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    The distortion could be caused by a bad power tube. Have the tech start with trying different power tubes.
     
    jondom22 likes this.
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