Old electrolytic capacitors

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  • eccerr0r
    Solder Sloth
    • Nov 2012
    • 8701
    • USA

    #1

    Old electrolytic capacitors

    for the heck of it here's some old capacitors that I had lying around. I didn't measure their capacitances yet as I'd have to use my Sencore but I'm too lazy to get to it right now. However my ESR meter is right here (60KHz analog)



    Some of these are probably still serviceable... I guess it should be fairly easy to tell which are NOS and which are pulls. The 150V 100uF CDE is the bad cap I pulled from my radio in the ghetto mods thread.

    Actually I think that 1958 Audiovox may be a 1968 but the lettering is in such poor shape I can't tell. The 1962 Audiovox is bad or at best "marginal".

    I think other than the Rubycon and STM all were made in the USA. I don't know where the STM was made.
    Attached Files

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  • RetroComputingGrotto
    Opinions/Advice on Do/Should I replace ALL Electrolytic Capacitors on old equipment?
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    I've just been repairing some (very) old speakers with a loud hum that occurred as soon as you powered them on regardless if any actual audio is played through them. I work in a School so it's 99% likey that the Teachers have hardly ever turned the power off on them for well over 10+ years.



    As you can see the top large capacitor on the right has a bulge on the top so defincately needs replacing. As the one next to it is exactly the same capacity and voltage I planned to replace them both.


    What is your advice/opinion on whether or not on old(er)...
    04-03-2024, 08:30 AM
  • alfredo2j90
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    by alfredo2j90
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    I have a few questions regarding these issues.

    1. Does using an electrolytic cap stop it from drying out or is it natural process that happens regardless?

    2. With the breakdown of the oxide layer the ESR will increase as well as DC leakage. Say the cap has remained unused on a motherboard, psu or games console for many years, if the cap does not physically pop when power is applied what other damage could occur to the system if it was...
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    it has inside:
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    12-24-2023, 04:41 AM
  • proxneo
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    I am performing a repair on a Sony ICF-SW55, which includes recapping (some) of the SMD capacitors on the mainboard. I am looking for verification of their values. At the moment, I'm 95% sure I've got the right values, but it is hard to find some official, credible or multiple independant sources on this.

    At the moment, I have selected replacements based on the following list of values:

    3 x 470uF 10VDC
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    06-21-2023, 12:38 AM
  • sam_sam_sam
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    07-13-2024, 08:14 PM
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