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Cap Polarity

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by devbro, Sep 22, 2006.

  1. devbro

    devbro Member

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    I just got my bias supply cap from Hoffman and I can't determine the polarity. It's a Xicon brand and one side is silver foil and the other is black paper with a dot. Which is positive?

    [​IMG]

    I seem to remember reading something about this..............:jo
     
  2. Tuberattler

    Tuberattler Member

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    The black (insulated) end is Positive + and the silver end goes to ground. If you'll notice the lead for the ground goes right to the body of the cap.
     
  3. brad347

    brad347 Member

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    you will notice that there are little arrows with a minus sign inside them. They point to the negative lead.

    American caps generally have the + lead marked. Imported caps usually have the - lead marked.

    Also, the end with the 'ridge' near it is usually the positive side.
     
  4. devbro

    devbro Member

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    Bingo...!
    You guys rock....:AOK
     
  5. VaughnC

    VaughnC Supporting Member

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    If that cap is going into the bias supply, the positive (notched) end of the cap connects to ground. The bias supply puts out a negative voltage and the cap will likely explode if it's installed backwards.
     
  6. devbro

    devbro Member

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    Well.......it worked and no fireworks but I didn't really notice any reduction in hum like l was hoping for............Anyone know where to get a clear legible schematic for a Bassman 6G6-B? Every one that I've seen is so blurry I can't read the values. I even bought Dave Funk's book because supposedly, the schematics were "computer enhanced" :BITCH
     
  7. Dave C

    Dave C Gold Supporting Member

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  8. devbro

    devbro Member

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    Thanks Dave. Yup, it's the same blurry version schematic everyone has. Maybe Fender sells clean copies.
     

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