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new SVP-Pro thread "bell noise"

Discussion in 'Amps and Cabs [BG]' started by chalie, Mar 9, 2006.


  1. Hey,
    I just have this baby a week ago and last night it was my first time to go for a big ride. I noticed that there is a bell like noise coming out the cab time to time and as well when you knock the case of the preamp.
    I wonder if you experienced this as well and what is the cause.
    I remember that kind of sound may come from the tube if you hit the tube while is on but my case it happens already when it is vibrate from outside.
    I was asking the Ampeg but no reply yet.

    Thanks
     
  2. possible microphonic tube? how significant is this bell noise?
     
  3. Eric Cioe

    Eric Cioe Supporting Member

    Jun 4, 2001
    Missoula, MT
    Sounds like a microphonic tube. Try pulling each tube, one at a time, until you isolate the culprit.
     
  4. Well... as soon as a it gets to the right frequencies you will hear that noise clearly
    more like .. ringing
     
  5. I will do that to fine out but I hope the factory agree with me to do so and not violate the warrantee
    Thanks