My shuttle 6 is acting up

Discussion in 'Amps [BG]' started by Etienned, Feb 17, 2013.


  1. Etienned

    Etienned

    Joined:
    Jul 16, 2010
    Location:
    Montréal
    Every once in a while, when I turn the power switch on on my shuttle 6, I get a very strange crackling noise accompanied with "a fm-radio off tune'' noiselike distortion. Today it happened again and I even noticed a large displacement of the speaker like I never saw it move before while playing through it.

    I tried different kettle cords, with or without aux in, tuner out ; also with both of my 112 cabs (one has a speakon connector genz benz built in and the other has a speakon cable) . My luthier tried cleaning the jack inputs (all of them, including the fx loop) with a special tool. But the problem still persist.

    Now I'm reading here that it could be a faulty tube in the preamp section... I have no idea on how to check and replace the tube, I don't know where to look for them inside the amp, I don't know which screws I have to remove to access or whatever, and I'm not sure on which tube to buy. I wrote to Genz Benz a few month ago, but I haven't heard of them. Could anyone guide me in the procedure ? I suppose I could bring the amp to a technician but I would prefer to learn how to do it in case it is needed again in the future.
  2. agedhorse

    agedhorse Development Engineer-Mesa, Product Support-Genz Supporting Member

    Joined:
    Feb 12, 2006
    I haven't seen anything from you. Perhaps you could PM me and I will walk you through a few troubleshooting steps to identify the problem. It may be nothing more than a defective tube, if so I will walk you through replacing that as well.
  3. Etienned

    Etienned

    Joined:
    Jul 16, 2010
    Location:
    Montréal
    Yeah, some spam filters classify my email addy as spam. You, Sir, have a pm coming your way...
  4. ezstep

    ezstep

    Joined:
    Nov 25, 2004
    Location:
    north Louisiana
    Good to see someone knowledgeable jump on this so quickly. Good deal, Andy!
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  6. Sav'nBass

    Sav'nBass Supporting Member

    Joined:
    Jan 18, 2009
    Location:
    Northern Va.
  7. JimmyM

    JimmyM Supporting Member

    Joined:
    Apr 11, 2005
    Location:
    Apopka, FL
    Disclosures:
    Endorsing: Ampeg Amps, EMG Pickups
    Tubes are easy. Unbolt the lid, spot the tube, pop it out, pop the new one in the socket, done.
  8. agedhorse

    agedhorse Development Engineer-Mesa, Product Support-Genz Supporting Member

    Joined:
    Feb 12, 2006
    Responded. We have some pretty agressive spam filters in place, otherwise life would be pretty miserable and my delete button would get worn out in a hurry ;)


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