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Thread: Re-Capping

  1. #1
    Join Date: Sep 2017

    Location: Northampton

    Posts: 177
    I'm Chris.

    Default Re-Capping

    Hi all

    When would you consider re-capping a power amp? Does it start sounding different, less dynamics perhaps? Maybe just after a certain length of time? Just wondering

    Chris

  2. #2
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 99,005
    I'm Grant.

    Default

    Most modern Amps of decent quality should last 20 years if not over used or abused before trouble occurs but that's just an estimate and every one will be different. Only way to be sure is to test the caps
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
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    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

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  3. #3
    Join Date: Sep 2017

    Location: Northampton

    Posts: 177
    I'm Chris.

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    Quote Originally Posted by struth View Post
    Most modern Amps of decent quality should last 20 years if not over used or abused before trouble occurs but that's just an estimate and every one will be different. Only way to be sure is to test the caps
    Do things just sound different?
    Last edited by Lerxst; 30-12-2017 at 22:21. Reason: Wording

  4. #4
    Join Date: Aug 2010

    Location: Torquay, Devon.

    Posts: 5,684
    I'm Shane.

    Default

    If it ain't broke, don't fix it!

    S.

  5. #5
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

    Default

    Quote Originally Posted by Lerxst View Post
    Do things just sound different?
    often yes.. lose a bit of drive and speed etc.. bass can drop, and its possible for hum to appear. Will often go for 30 years but can be a lot earlier. Different makes of Cap fail worse than others.
    If in doubt, take it to someone for a service.
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***SMILE, BE HAPPY***

  6. #6
    Join Date: Sep 2017

    Location: Northampton

    Posts: 177
    I'm Chris.

    Default

    Ok, cheers,

    I just wanted to know what the symptoms are really. Not going to interfere until then.

    Thanks
    Last edited by Lerxst; 30-12-2017 at 22:31. Reason: can't spell

  7. #7
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    Quote Originally Posted by Lerxst View Post
    I just wanted to know what the symptoms are really
    Loud bang, blinding flash and billowing smoke!



    I guess that's possible , but more likely you'll just hear anomalies in the sound. Electrolytic caps can show their age visually by leaking or swelling.

  8. #8
    Join Date: Aug 2008

    Location: Suffolk, UK

    Posts: 1,473
    I'm Paul.

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    Generally if a powersupply cap goes duff it either explodes, swell or it starts to leak DC current and eventually can cause a fuse to blow. There can be more subtle issues but you need a scope to see what may be going on.
    ~Paul~

  9. #9
    Join Date: Apr 2012

    Location: London

    Posts: 685
    I'm James.

    Default

    PSU caps can cause hum as they age. Coupling caps can fail and shunt large DC voltages into the circuit with sometimes catastrophic results to the amp and/or speakers. Any mid price Eastern amp from the mid nineties to the mid noughties could have faked 'branded' caps installed during manufacture and need a good look at. Before and after this time you should be pretty safe.

    Sent from my GT-I9195 using Tapatalk

  10. #10
    Audio Al is offline Pishanto Specialist & Super-Daftee
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 11,215
    I'm Allen.

    Default

    What amp is it and how old ?
    [

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