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Is this an overheated voice coil?

Discussion in 'Amps and Cabs [BG]' started by ficelles, May 16, 2018.


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  1. ficelles

    ficelles

    Feb 28, 2010
    Devon, England
    Is this the sign of an overheated voice coil, or just some weird corrosion?

    7A38AEB1-97CF-49FB-8189-876576C5CE90.
     
  2. rufus.K

    rufus.K

    Oct 18, 2015
    SoCal
    wow. if that a Vifa ?
     
  3. tadawson

    tadawson

    Aug 24, 2005
    Lewisville, TX
    Looks like nothing more that a bit of corrosion on some manufacturing swarf to me . . . The vc isn't close enough to the backplate to transmit that much heat there if it tried . . .

    - Tim
     
  4. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    You should carefully clean that stuff off.
     
  5. ficelles

    ficelles

    Feb 28, 2010
    Devon, England
    Toxic? I wiped it off into the trash with a paper towel, came away as a powder.
     
  6. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    Truthfully I don’t know. My dad would have - he was a Metallurgical Chemist. I followed Electrical Engineering. :)
     
  7. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    It's likely zinc oxide, harmless corrosion unless it ends up in the gap due to storing the speaker in damp places.
     
    Tom Bomb, ficelles and Stumbo like this.

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