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Ordinal Woes

Discussion in 'd.i.y.' started by Lancastrian, Aug 21, 2017.

  1. Lancastrian

    Lancastrian Well-Known Member

    Having had my PT Ordinal DAC since late 1993, the capacitors finally succumbed from 24 years of use. It was only due to an inspection ahead of a HDCD filter chipset arriving, that I saw some signs of something awry.

    Twenty-two 2200uf/16v LXF capacitors
    [​IMG] by Ian Allen, on Flickr

    Signs of leakage
    [​IMG] by Ian Allen, on Flickr

    The mess after removal
    [​IMG] by Ian Allen, on Flickr

    Post clean up
    [​IMG]by Ian Allen, on Flickr

    Populated with new Nichicon KA type 2200uf/16v capacitors.
    [​IMG]by Ian Allen, on Flickr

    Thanks to Nick Lucas at HiFi Collective as I was able to pop round and pick up the capacitors and complete the repair in an afternoon.

    Ian
     
  2. sq225917

    sq225917 situation engineer

    Good catch and save...
     
  3. snowman_al

    snowman_al pfm Member

    +1.

    Also interesting how the electrolyte has only attacked and 'etched' the negative poles.
     
  4. Pete MB&D

    Pete MB&D Pete Maddex, the one and only!

    Electroplating?

    Pete
     
  5. davidjt

    davidjt pfm Member

    Is this a common failure?

    I'd always assumed that a cursory glance at the top of electrolytics was sufficient: i.e. the triangulated top is designed to burst and that's where any leak will be. This is clearly wrong, although it does seem to apply to those in the MDAC.
     
  6. df_genius

    df_genius Solder slinger

    Sometimes they bulge out at the top, others they leak out of the bottom. Good job but have you checked the voltages they are seeing before replacing with 16V parts? it could be close to their voltage rating, this will shorten their life
     
  7. Lancastrian

    Lancastrian Well-Known Member

    One of the issues is physical can size restriction, and with the 105 degree requirement, there is a limit to what is out there, of good enough quality that is. Nichicon do have a 25v version with the same diameter, and doing some research last night, they even have a 3300uF 25v version with the same 12.5mm diameter, so at a later stage I could move to these.

    Ian
     

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