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Old 14th February 2005, 11:27 PM   #1
OMNIFEX is offline OMNIFEX  Jamaica
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Question Dried Capacitors

Whats the symptoms of having capacitors dried?

Is age only the factor?

Could they dry up faster having the amplifier plugged in
the receptacle for years, but never being powered up?
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Old 14th February 2005, 11:52 PM   #2
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Hi,

Electrolytic capacitors can dry with time, because they have
liquid inside.
If they are not in use, they will dry slower.
As electrolytic capacitor dries it's value will go down a bit.
In my opinion, aged electrolytics sound better, just like
old wine. (of course there is good wine and bad wine)

Udi.
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Old 15th February 2005, 12:46 AM   #3
Stocker is offline Stocker  United States
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Temperature (higher) is also a contributing factor. Ambient temperature as well as ripple current. Also excessive voltage in service. Basically anything that makes the cap. get hotter will shorten its life.
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Old 15th February 2005, 01:11 AM   #4
Enzo is offline Enzo  United States
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If the amp is not powered up, it has no way of knowing if it is plugged in or not.
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Old 15th February 2005, 02:33 AM   #5
Stocker is offline Stocker  United States
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The possibility exists that the power supply may be powered all the time. Switched rails, vs. switched mains.
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Old 15th February 2005, 03:53 AM   #6
d3imlay is offline d3imlay  United States
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There is a predicatable curve that shows the life expectancy of a cap at various temperatures and ripple current. That assumes continuous operation at some level which audio amps don't run. The only caps that actually see and ripple current is the main filters. Board mounted stuff doesn't usually see much ripple.
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Old 15th February 2005, 03:29 PM   #7
OMNIFEX is offline OMNIFEX  Jamaica
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Thanks



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Old 15th February 2005, 03:55 PM   #8
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you should search for " capacitor forming " on the net you will fin usefull information.....

according to me in an equipement in storage ( no voltage applied ) capacitor will degrade because theere is no electric effect on aluminium oxide regenerate the insulation...
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