1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  
    TalkBass.com has been uniting the low end since 1998.  Join us! :)

My GenzBenz is eating tubes!

Discussion in 'Amps and Cabs [BG]' started by wvbass, Jan 27, 2013.

  1. wvbass


    Mar 1, 2004
    I bought a new Shuttle 9.0 in May. Very quickly, (first gig, actually) I started hearing some noise in the amp. GB helped me diagnose this as a faulty preamp tube. I replaced the tube with a nearly-new tube (1-2 hours of previous use) and all was well. A month or two ago, the amp started doing the same thing. I replaced the tube again. Tonight, I started hearing the noise coming back. So...

    * Am I just unlucky? I haven't use the same brand or supplier when replacing tubes.

    * Are tubes just that crappy now? And I should expect to use 4-6 tubes per year?

    * Is something wrong with my amp?

    * Could a power issue be the culprit? My amp spends most of its time plugged into the same place.
  2. SirMjac28

    SirMjac28 Patiently Waiting For The Next British Invasion

    Aug 25, 2010
    The Great Midwest
    Sounds like the amp preamp tubes can last the lifetime of the amp
  3. Jim C

    Jim C Spector#496:More curves than Sophia + better sound Supporting Member

    Nov 29, 2008
    something is wrong with your amp
  4. wvbass


    Mar 1, 2004
    I am thinking that, too. I could be victim of bad luck with tubes, but it seems unlikely.

    I have a backup head or two, so it is not a crisis. I will give it a little time to see if I can get help here before I call Fender for support.
  5. vernhillbass


    May 11, 2012
    I've had a Shuttle 9.0 for a couple of years and never had a problem. if you registered it with Genz they carry a 3 year warranty. Check their website. Plan on it taking a couple of weeks unless you want to pay about $50 for an expedited service call. Good luck!
  6. Dave W

    Dave W Supporting Member

    Mar 1, 2007
    White Plains
    I'd definitely bring the amp in to have it checked, that's not normal at all.
  7. nostatic

    nostatic Supporting Member

    Jun 18, 2004
    los angeles, CA
    Endorsing Artist: FEA Labs
    It's Fender's fault

  8. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    This is not normal and there's nothing in the amp's circuitry that could possibly cause this (premature tube failure) but I would like to check your amp over to be sure it's not something simple like a bad tube socket or even something not tube related but in that area of the amp. It's also possible (but unlikely) that you have been extremely unlucky with bad tubes, be sure to send them all back with the amp so that we can test them as well.

    PM me and one of us in R&D will take care of it ourselves. Should take only a couple of days, and under warranty.
  9. bluesbass99


    Jun 14, 2006
    Atlanta, GA
    This is why I love this company.
  10. wvbass


    Mar 1, 2004
    Will do. Thanks!
  11. Texan

    Texan 667 Neighbor of the Beast.

    Aug 15, 2004
    Houston, TX

    I just hope that Fender does not kill the customer service that Genz is known for.
  12. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    I had a MesaBoogie amp that ate pre-amp tubes for lunch. The amp had a fault in the power supply and the plate voltage was higher than it should have been. It was an easy fix.
  13. I bought the same amp in April - never had a problem with the tube. Utilize that warranty, son!
  14. wvbass


    Mar 1, 2004
    There is a thread for this type of comment. Please do not post this stuff here; I opened this thread so I could get some help - and if it is a simple problem, maybe others can benefit from information regarding the solution.
  15. SHardin


    Aug 9, 2012
    Norhern Indiana
    Yep, sounds like the heater curcuit is fouled up and putting too much voltage on tubes. Could also be the high voltage, but I would guess heaters first. Not right for a new amp.
  16. SirMjac28

    SirMjac28 Patiently Waiting For The Next British Invasion

    Aug 25, 2010
    The Great Midwest
    Very cool good to see that kind of help and customer service.