Capacitor help!!

Discussion in 'Marshall Amps' started by MichaelOBrien, Mar 28, 2020.

  1. MichaelOBrien

    MichaelOBrien New Member

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    Hello all,

    I am working an old Marshall Jubilee and it has a blown capacitor. For the life of me I can't seem to find the right capacitor. Its a 4700uF with 80WV and contains 4 pins. Does anyone know where I could find a capacitor like this? Attached is the photo.

    Thanks for your help!
     

    Attached Files:

  2. Kelia

    Kelia Well-Known Member

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    The great tone from the Jubilee doesn't come from the secret diodes but from this special
    secret capacitor !!..:thumb:


    Jokes aside ,...someone will chime some time soon !
     
  3. MichaelOBrien

    MichaelOBrien New Member

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    Haha im starting to think that actually. :)
     
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  4. ampmadscientist

    ampmadscientist Well-Known Member

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    This capacitor has 4 pins, but it's only a 2 terminal normal high current single filter capacitor.
    The other 2 pins are for mounting.
    80WV refers to the max "working voltage" voltage and ripple current allowed across the capacitor.

    Will he find an exact match that fits the footprint of the board?

    I rather doubt that but a regular filter cap can be substituted easily.
    It's just a regular filter cap.
     
    Last edited: Mar 28, 2020
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  5. MichaelOBrien

    MichaelOBrien New Member

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    Genius! thank you so much!
     
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  6. Matthews Guitars

    Matthews Guitars Well-Known Member

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  7. ampmadscientist

    ampmadscientist Well-Known Member

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    If you can, get 100 volt instead...(replace both 4700 uF can caps)
     
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  8. ampmadscientist

    ampmadscientist Well-Known Member

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  9. MichaelOBrien

    MichaelOBrien New Member

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    Oh wow! Thank you so much! Thats a huge help. :) :) :)
     
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  10. ampmadscientist

    ampmadscientist Well-Known Member

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  11. Matthews Guitars

    Matthews Guitars Well-Known Member

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    That is higher. 100 wv vs 85 wv. There's really no benefit to going to even higher voltage ratings. In fact, capacitors are rated by their capacitance AT their rated working voltage. If you were to pick a cap with a very different voltage rating, it may not function as well as one chosen for the actual circuit voltage.

    Just go to digikey and start searching in the aluminum electrolytics. Start with capacitance then pick your voltage ranges and then start weeding out the candidates.
     
  12. Matthews Guitars

    Matthews Guitars Well-Known Member

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    And, when you want to constrain yourself to a four-lug snap-in cap that is going to fit up to that PC board and is at or close to the specs listed, that's pretty much the only one that fits the bill.
     
  13. Matthews Guitars

    Matthews Guitars Well-Known Member

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    The life span of the cap would not be directly related to a higher voltage rating. But a cap like that might be available in a long life form. Rated for X hours at 105c, maybe.

    By preference, I'll spend the extra bucks for long life/high temp types. When I rebuilt my Krell power amps, I was able to find some caps that were 10,000 hours @ 125c. Those should be lifetime parts.

    This four lug snap-in canister type is going to have relatively few options. Whenever a company chooses somewhat unique parts it will cause parts supply issues in the future.
     
  14. mickeydg5

    mickeydg5 Well-Known Member

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    My question is why does a new(er) Jubilee require a capacitor replacement already?

    Please tell which model you have and the date for it.
     
  15. HOT TUBES 70

    HOT TUBES 70 Well-Known Member

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    Nichicon seem to be the " Go to " cap brand from what i know .
    Opinions may vary ...
     
  16. Sir Don

    Sir Don Well-Known Member

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    He did say it was an 'old' Marshall so, presumably, a 1987 year.
     
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  17. Matthews Guitars

    Matthews Guitars Well-Known Member

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    I think there's enough evidence to show that the blue Daly capacitors of the JMP era have a very long working lifespan.

    But when it comes to PC board mounted capacitors, I'd advocate being much more religious about a 15 to 20 year replacement cycle,
    and in many cases, even shorter cycles. I've seen equipment that wasn't 15 years old yet and the caps were leaking and corroding the traces off the board.

    Without a doubt, ANY amp made in the 80s is now quite ripe for capacitor replacement.
     
    Last edited: Mar 29, 2020
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  18. mickeydg5

    mickeydg5 Well-Known Member

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    If I recall correctly there is no 4700uF in a 1987 Jubilee.
     
  19. ampmadscientist

    ampmadscientist Well-Known Member

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    I doonoo.
    I never saw a cap like that from China, in a 1980s Jubilee.
    Maybe I wasn't paying attention.
    I was too broke to pay attention.
     
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  20. mickeydg5

    mickeydg5 Well-Known Member

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    It is not on the schematic either.
     

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