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Thread: Please Help ID This Little Cap

  1. #1
    Forum Member 5er Driver's Avatar
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    Please Help ID This Little Cap

    Can you tell the rating specs for this cap in the pic? Its in a '79 Fender Twin 135w UL. I can't tell anything from the print on it - 7843A 235. There are 5 others in it that are clearly marked 25UF-25VDC-85°C that are the same size as this one, 18mm long and 9mm diameter. I need to replace all 6 but can't ID this one.....




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    The 5er Driver

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  2. #2
    Forum Member Kap'n's Avatar
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    Re: Please Help ID This Little Cap

    If that runs to pin 8 of the tremolo tube (and it should), it's a 5uF, 50V capacitor.
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  3. #3
    Forum Member 5er Driver's Avatar
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    Re: Please Help ID This Little Cap

    Thanks Kap'n,

    It does run to pin 8 of V 5. Its leaking and is probably a contibutor to a faint ticking noise I hear when the Trem is on. I was able to locate it on a Fender/Rogers/Rhodes schematic that I just downloaded, I'm a noobie in electronics.........The schem isn't dated but is part number 013694 - 135 Watts RMS AMP W/REVERB and VIBRATO. It has a box that says: Used On
    Vibros.Rev.
    Sup.Six Rev.
    Quad Rev.
    D.S. Reverb
    Twin Rev.

    Let me know if you want it.


    Edit: I've surfed and surfed but can't find a cap rated at 5uF 50V. The closest I've found is 4.7uF 63V. Will this work?

    Thanks Again.
    Last edited by 5er Driver; 04-02-2007 at 03:25 AM.
    The 5er Driver

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  4. #4
    Forum Member Keystring's Avatar
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    Re: Please Help ID This Little Cap

    Close enough.

  5. #5
    Forum Member Plugger's Avatar
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    Re: Please Help ID This Little Cap

    Quote Originally Posted by Keystring View Post
    Close enough.
    Yep. Electrolytic cap values are normally rated with a 20% tolerance anyway. So a 4.7uF could be as high as 5.64uF or low as 3.76uF and still be within manufacturing limits.

    -Mark

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