33175Re: [midatlanticretro] buying NOS caps?
- Nov 11, 2013-------- Original Message --------
> From: "David Gesswein" <djg@...>enough
> Sent: Monday, November 11, 2013 9:32 PM
> To: email@example.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.old
> > 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 hadluck
> > withe unused but old Caps like these.be
> 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 itsold
> or if your wanting it to last another 40 years a new cap would be better.rate
> 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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