P2201 : thinking PS Recap

Discussion in 'Yamaha' started by dondoucette, Jan 18, 2015.

  1. dondoucette

    dondoucette AK Subscriber Subscriber

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    P2201 : thinking PS Recap Some Help/Info needed.

    So I was thinking of picking up 4 22,000uf 100v capacitors to recap my two P2201's
    At this very moment I can't open either one to measure the physical dimensions of the originals. I don't think mistakenly buying a replacement capacitor that is physically bigger than the originals is likely however I don't want to make that mistake.

    Also I was thinking if I find 27,000uf that will more closely match the dimensions of the originals I might opt for the slightly larger capacitor.

    So it might be a stretch but has anyone here done a recap and can share the measurements of the OE capacitors.

    Thanks in advance.
    Don


    Ahem... Hey mister, could you spare a pc5002m?
     
    Last edited: Jan 18, 2015

     

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  2. dondoucette

    dondoucette AK Subscriber Subscriber

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    Well I opened one of my amplifiers up.
    Physical size of those capacitors is 2.5" diameter by 4.5" tall

    Should be able to find a suitable replacement to fit in that space.
     
  3. tyeeslayer

    tyeeslayer Super Member

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    Probably a good idea especially if they were ever "used hard and put away wet".
    Or spent time in a rack.
     
  4. dondoucette

    dondoucette AK Subscriber Subscriber

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    Yeah the newest addition to the collection looks like it had a rough life and probably seen more than one drink spilled on it.

    [​IMG]

    [​IMG]
     
  5. dondoucette

    dondoucette AK Subscriber Subscriber

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    Has anybody ever heard of EPCOS Capacitors
    Supposed to be good for 12,000 hrs @ 85c and I can get them for $50 each plus shipping.
     
  6. belgianbrain

    belgianbrain Super Member

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    I think that's what I used in my M2.

    If memory serves, it was on the only brand readily available.
     

     

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  7. tyeeslayer

    tyeeslayer Super Member

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    Looks good, should be an easy swap-out too.
     
  8. dondoucette

    dondoucette AK Subscriber Subscriber

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  9. dondoucette

    dondoucette AK Subscriber Subscriber

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    Guess I'll order the EPCOS capacitors.
     
  10. ConradH

    ConradH Addicted Member

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    This is a case where measurements make sense, unless you're made of money. There's an excellent chance that there's nothing wrong with those caps. The Epcos "12,000" hour part is also a 2000 hour part by the standard tests everybody normally uses. Or, to put it another way, all caps that don't have some initial manufacturing defect will go way more than 12,000 hours when derated. The odds of other caps being "tired" are probably higher than the PS.
     
  11. dondoucette

    dondoucette AK Subscriber Subscriber

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    No doubt. A future endeavour to be sure.
     

     

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  12. dondoucette

    dondoucette AK Subscriber Subscriber

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    Caps are ordered.
    Pics of swap out when they arrive.
    Then I will go through the amps and make a list of all the other capacitors needed.

    Also I'm working on a project with a buddy of mine to improve the appearance of the old Yammies. Stay tuned.
     
  13. dondoucette

    dondoucette AK Subscriber Subscriber

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    Gave one of my P2201's some TLC today.

    [​IMG]

    [​IMG]

    [​IMG]

    So while I was rooting around inside I saw this...

    [​IMG]

    [​IMG]

    I don't recall seeing anything like this except around a flyback transformer in old CRT TV's. What the heck?

    Left channel was 17mv and right was 19mv, both adjusted to 10mv and done.
    Hooked it back up and it sounds a bit better but I still have a little hum on the left channel.
    Next up are all the other electrolytics in the amp then I'll move on to the rest of the capacitors.

    But first I need to track down the source of this hum...

    So just for interests sake I tested the old caps on my Sencore LC77 and the were not in good shape. ESR was 9ish ohms on one and over 6 on the other, dielectric absorbtion and leakage current were also bad, it was time.
     
  14. avionic

    avionic " Black Knights " Subscriber

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    Most likely tar and nicotine with a side of dust.
     
  15. dondoucette

    dondoucette AK Subscriber Subscriber

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    Yeah probably
     
  16. EvanF

    EvanF AK Member

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    Ever track down the source of hum? I have a P2200 that has had a full recap as well with no solution to the hum. I checked the solder joints too.
     

     

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  17. miklemke

    miklemke AK Subscriber Subscriber

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    Is it a grounding problem?
     

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