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Sputtering noise in mics

Discussion in 'Pro Audio Equipment' started by John Stafford, Apr 1, 2005.

  1. John Stafford

    John Stafford Well-Known Member

    Hi all
    I have a tube mic that intermittently makes a sputtering noise. I've had that before on other mics, but it was caused by condensation and easily fixed. I know a faulty tube can cause this as well.

    If the above causes can be ruled out, is there another reason why this should happen?

    Thanks
    John Stafford
     
  2. Sebatron

    Sebatron Well-Known Member

    It's almost definately moisture in the capsual/element.

    You could try this.....
    Short out the element by bridging a wire across the two terminals of it.
    Listen to the noise of the electronics only.

    If the spluttering is still there that confirms it ain't in the element.

    Re-solder solder joints using fresh solder....
    Clean out the tube/valve socket.
    Maybe replace valve...
    Clean the pins on the valve with emery/sand paper etc. so they are shiney and not looking corroded...
    Examine any electrolytics for leakage....replace if required .... ( though this is unlikely).....

    If the noise disappears when you short out the element ,, then it must be the element....
    In which case i suggest you leaving it outside in the sun between 5 and 10 minutes ........
    Don't cook your gear. :lol:

    Hope this helps.

    8)
     
  3. John Stafford

    John Stafford Well-Known Member

    That's a brilliant idea! This sounds the same as the sputtering caused by moisture, but I've tried everything and the sputtering had gone away, but it just returned and i can't imagine how. Having said all that, this capsule is hyper sensitive to humidity (if I breath near the mic it starts to misbehave).

    I'll try that shorting idea first.

    I really appreciate your help :cool:

    John
     
  4. John Stafford

    John Stafford Well-Known Member

    The capsule has three wires coming from it. There's one from the centre of each diaphragm, and another from the body of the capsule itself. Should I connect the capsule wires to the one from the capsule body?

    BTW when I remove the grilles the hum is very high, so I hope that won't stop me listening to the electronics.


    I really appreciate your help :D

    Thanks
    John
     
  5. John Stafford

    John Stafford Well-Known Member

    I've connected the centre of each capsule to the body. All I can hear is valve hiss, with a very mild hum. Actually, there's less hum than when the capsule is working!

    This is very reassuring. I was certain that I had done everything possible to get rid of capsule moisture, but I'll just have to try harder!

    Thanks again :D

    John
     

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