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33175Re: [midatlanticretro] buying NOS caps?

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  • B. Degnan
    Nov 11, 2013
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      -------- Original Message --------
      > From: "David Gesswein" <djg@...>
      > Sent: Monday, November 11, 2013 9:32 PM
      > To: midatlanticretro@yahoogroups.com
      > Subject: Re: [midatlanticretro] buying NOS caps?
      > On Mon, Nov 11, 2013 at 08:12:33PM -0500, B. Degnan wrote:
      > > How well do unused caps work, say 20 years old?
      > >
      > From my using ones in my bags of spare caps I've picked up they normally
      > are fine. There have been batches of bad caps were made which will
      > fail too soon no mater what but most are ok. I probably haven't used
      > to have good statistics though.
      > > Here is an ebay.com auction - 261326117022
      > >
      > > These look correct (to replace in an Altair disk drive) but they're new
      > > stock, no idea how old. Just curious if anyone here (Corey) has had
      > > withe unused but old Caps like these.
      > >
      > If your replacing it because its failed I would do a quick test (ESR,
      > leakage at rated voltage, C) of the replacement NOS cap but expect it to
      > fine and last a reasonable time. If your replacing it just because its
      > or if your wanting it to last another 40 years a new cap would be better.

      > If I have a suitable cap in my pile I use it. If I have to order and can

      > find a reasonable match and price I'll get new otherwise NOS.
      > > Basically my question is - do old caps "keep"?
      > >
      > > I thought not.
      > >
      > Heat is the number one killer. That's why ones in power supplies tend to
      > be the biggest problem. Caps will fail with time but at a much slower
      > at room temperature (exponential increase).

      Thanks Dave. This explains it all very nicely.

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