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In Reply to: RE: Capacitor real lifetime posted by tweaker456 on August 31, 2022 at 20:42:53
"The lifetime doubles for each 10°C reduction in temperature, so a capacitor rated at 5,000 hours at 105°C would have a service life of 10,000 hours at 95°C and 20,000 hours at 85°C."
So let us calculate the real lifetime of a cap rated at 1000 hrs at 85C which is 185F. Let's chose 90F as a realistic operating temperature for this example. 90F=32C. So here we go. 2000hr at 75c. 4000 hrs at 65C. 8000 hours at 55c. 16000 hrs at 45c. 32000hr at 35C. So there you have it folks. the Elna Silmic ll is rated at over 32000hr operating life at a rather warm 90F. That, in my book is a lot of listening time. Once you have listened for a bit more then 32000 hours to possibly the best sounding electro cap in the known universe I would suggest putting new ones in if if they are still around and you are still around. Tweaker456
EDIT: That comes out to be about 3.65296803653 years of continuous listening. So let's just say you listen 4 hours a day and shut your device off. Let us now take 24 and divide it by 4. 3.65296803653 x6= 21.9178082192 years those fab Elna Silmic lls will last ya based on their rating.
"Embrace the mundane"- Dan John
"Embrace the mundane"- Dan John
Follow Ups:
I appreciate accuracy in numbers.
But? .00000000003 of a year? At this point, it becomes important to note that a day is NOT 24 hours, but rather 86400 seconds....but that's just an average and does vary.
Less implied accuracy in your result.......1/1000 of a year is probably close enough? would be fine.
Reliability numbers are statistical and subject to a 'plus/minus' so giving it to the microsecond is a good exercise in 'calculator' but of little practical value.
Too much is never enough
For example, if the cap fails less than 5% of the time after 5,000 hours at 130c it passes that rating.
Caps can live a long time, it is not like a fresh salmon expiration date at room temp or something. You just don't want your car to crash, jet fighter to drop out of the sky or hospital equipment to fail more than 5% of the time.
That may be a good reason to use a fan on tube equipment. To keep other components from extreme temperatures. Place an electrolytic too close to a power tube and it can get pretty toasty.
Caps also heat from within, based on the level of ripple voltage they're exposed to.
I like your suggestion to use fans where possible.
~!
The Mind has No Firewall~ U.S. Army War College.
It's important to look at that spec when building power supplies ,mostly for 50/60hz. Switch mode power supply output caps have another set of parameters to consider.
there's been talk of counterfeit parts in components. It's hard to tell, the copies supposedly look identical.
And if the 105c rating is falsified and 5 years later it sounds like crap, what are you going to do? Warranty is expired, you have to recap, that's about it. We've heard the stories of recapping here on AA many times
I have Rubicon 'The Muse' in a tube preamp that I've had for almost 20 years. I never leave it on and it sounds just fine as always. I never leave a power amp on 24/7. I've run a few trials by leaving things on for a week and heard no difference from a few hours run time, at least none that were noticeable enough to warrant leaving anything on except for break-in
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