Destroyed filter caps

Discussion in 'Exclusively Sansui' started by jeromach, Apr 19, 2017.

  1. jeromach

    jeromach With sufficient thrust, ducks fly just fine

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    Anyone ever seen something like this?

    These filter caps come from a Sansui BA-2000, they should measure 12k uF, but all four actually are between 5 and 6k uF. It seemed to still have been working.

    Bizarre, never seen anything like it;

    [​IMG]
     

     

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  2. DougBrewster

    DougBrewster AK Subscriber Subscriber

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    me either..
     
  3. gslikker

    gslikker Super Member

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    Hi Jeroen, it is like they caught fire....Did you see a small mouse run away, its mouth full of plastic, when opening the unit? Bizarre indeed...
     
  4. The Fuxtor

    The Fuxtor AK Subscriber Subscriber

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    They sure look like they got quite toasty!
     
  5. larryderouin

    larryderouin Turn it UP, POP? PLLUUEEEZZZZZEE Subscriber

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    Disconnect an measure again. IIRC capacitors connected in seriesand tested connected, will show 1/2 of the total capacitance of one cap. Something cooked them. But it doesn't look acute. Looks like a typical but extreme example of temp and a very long time. Like 40 years. At least they didn't blow open. Then you'd have a REAL MESS!
     
  6. jeromach

    jeromach With sufficient thrust, ducks fly just fine

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    I did not measure them in print or in series. Doing that, one of the pairs comes to 2817 uF. By the way they look I am not surprised :)

    And they will not blow open, at most leaking through the vent hole, which none of these has been doing.

    Normally I see these old caps gaining in capacitance when they get older, but perhaps that is the stage before they start loosing capacitance and actually die.
     

     

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  7. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    I see this too, and think this is very likely, having bought a Peak capacitor tester - and now testing most of what I remove. I also measure new capacitors going in, the above picture is gradually emerging, but I am still undecided about it. As regards the picture - I believe there was another BA-2000 here on AK that exhibited the same capacitor destruction, and as others have commented, I too am surprised they didn't blow up. :)
     
    Last edited: Apr 20, 2017
  8. skippy124

    skippy124 Super Member

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    Had something similar with an AU-717 a while ago

     
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  9. jeromach

    jeromach With sufficient thrust, ducks fly just fine

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  10. Overundr1

    Overundr1 AK Subscriber Subscriber

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    I know, I know, its a plot by the Nichicon gold tune cap department to get you to buy new ones :)
    -Lee
     
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  11. jeromach

    jeromach With sufficient thrust, ducks fly just fine

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    Well, this looks better, or not?

    [​IMG]

    [​IMG]
     

     

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  12. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Yes better, but even better in the amp perhaps?

    NT Capacitors :idea:
     
  13. jeromach

    jeromach With sufficient thrust, ducks fly just fine

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    Only the best ingredients! :)

    [​IMG]
     
  14. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Mmmm nice. - yum.
     

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