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Shuttle 9 - Preamp hiss...

Discussion in 'Amps and Cabs [BG]' started by Andysalt01, Nov 13, 2010.


  1. Andysalt01

    Andysalt01

    Apr 21, 2006
    London
    Hows it going,

    Just been doing a bit of home playing, not too loud, and all of a sudden there was a kind of a low background crackle/hiss/weirdness from my cab. :meh:

    I did a bit of investigation, changed the cab, the speakon, removed the effects from infront, muted the amp, disconnected the lead.....it was still there - even muted!!

    Playing with the controls on the front, turning the "Volume" right down on the preamp, it disappears. Does anyone know what this means?

    It kinda comes and goes for periods, but I'm a bit concerned about my amp!! thanks for any assists, and I know genz cruise round here so anything from agedhorse and the crew would be great.

    Thanks!! :help:
     
  2. JxBass

    JxBass Supporting Member

    Aug 5, 2008
    Could be the tube. A bad or loose tube often causes a popping sound versus a hiss (like mine did), but it could be a sign that it's starting to go or is perhaps defective.
     
  3. Andysalt01

    Andysalt01

    Apr 21, 2006
    London
    I thought the tube might be the reason, but then I thought that was controlled via the "Gain" on the preamp rather than the volume. Turning the gain down doesnt reduce the noise.......

    Hopefully not starting to go, as I've only had it for around a year or so, and not been used that heavily at all really.....
     
  4. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Sure sounds like a bad tube. The gain controls the drive to the tube and the volume controls the signal level from the tube.

    If you need more help troubleshooting, give Scott a call at the factory, he will walk you through it.
     
  5. hasbeen

    hasbeen Commercial User

    Sep 23, 2004
    Vice President, KMC Music. Warwick U.S. distribution, Ampeg distribution
    I agree with Andy.....sounds like a tube.
     
  6. Andysalt01

    Andysalt01

    Apr 21, 2006
    London
    Thanks guys, I'll get a new one in and see how thgat fairs! much appreciated, I'll drop a line once its resolved. Other than the tone and amp and looks, best thing is the customer support you guys provide.

    thank you
     
  7. JxBass

    JxBass Supporting Member

    Aug 5, 2008
    Mine was simply loose, right out of the box, most likely jarred loose during shipping. I reseated it and it's been perfect since. Yours may have come loose after a year of lugging it around, cab vibration, etc. Reseat it before buying a new tube, although having a spare is never a bad idea.
     
  8. Andysalt01

    Andysalt01

    Apr 21, 2006
    London
    Cool, I'll pop the lid later today and see if it has come loose at all. Havent moved it in a while so unlikely. Then roll on and get a new tube for the front end. Thanks again!
     
  9. JxBass

    JxBass Supporting Member

    Aug 5, 2008
    I'd be curious to know your findings on reseating and/or replacing the tube. The results could be helpful to others who encounter the same symptoms.
     
  10. Andysalt01

    Andysalt01

    Apr 21, 2006
    London
    Ok, so just got a new tube, popped the lid, removed the right hand bracket and.......stuck as to what the next step is!? :/

    Has anyone lese retubed the shuttle 9? the board on which the tube is mounted feels flimsy and I'm pretty shy in giving it a good yank as i reckon I'll ende up busting the board its on!! Technique, tips or howe to from this stage would be great!!!

    Thanks in anticipation, and I'll be sure to post results.

    Thanks again
    Andy
     
  11. Oldtimer

    Oldtimer Supporting Member

    May 4, 2002
    New Mexico
    Hold the circuit board with one hand, gently pull the tube out while slightly rocking the tube. When installing, line up the gap in the pins with the socket and reverse the procedure.
     
  12. Andysalt01

    Andysalt01

    Apr 21, 2006
    London
    Much obliged, thank you!! :)


     
  13. Andysalt01

    Andysalt01

    Apr 21, 2006
    London
    It appears it was the tube! No hiss having played the new one for a while, crystal clear, no hiss. I am a little surprised as I thought the average preamp tube lasted for ages, but its academic now as all in order.

    Thanks to all the replies and assistance, it is very much appreciated. Still on a learning curve with gear, and guess I will be forever and a day!! All part of the fun of it! :)
     
  14. jlepre

    jlepre Supporting Member

    Nov 12, 2007
    Cedar Knolls, NJ
    Is that tube covered under warranty?
     
  15. Oldtimer

    Oldtimer Supporting Member

    May 4, 2002
    New Mexico
    Still could have been a loose tube and just needed reseating. A good thing to have a spare anyway. Next time you're in there, try putting the original tube back in just in case it wasn't making good contact. The original tube may still be OK!
     
  16. JxBass

    JxBass Supporting Member

    Aug 5, 2008
    +1.
     
  17. Pilgrim

    Pilgrim Supporting Member

    Tubes normally last for years to decades, but one can always fail early - or as noted above, it may have been loose.
     
  18. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Tubes in general are lower reliability than transistors and because they are electromechanical, noises and variable performance is sadly not uncommon. It's not an amp problem, it's a tube problem and all manufacturers struggle (or should struggle) to obtain the highest possible reliability through forgiving designs, thorough testing and good tube manufacturer relations. Even then, some tubes will fail.
     
  19. Is it possible that the tube could be responsible for volume fluctuation? I have had a intermittent problem with that the last couple gigs.
     
  20. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Yeah, it's certainly possible. :bawl:
     

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