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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.

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

    Eric Cioe

    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