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Old 27th March 2013, 04:44 PM   #1
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Default Fake capacitors?

Are these fake? I can not seem to find their datasheet anywhere. They are purchased from local stores.

First capacitor, please ignore the ceramic cap soldered across its leads. I can not find a Rubycon USP series, nor a 10000uF 35V with a 105 deg rating.

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Second capacitor. (I can not find any datasheet for Samsung branded capacitor)

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Last edited by Navyblue; 28th March 2013 at 05:51 AM.
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Old 27th March 2013, 04:50 PM   #2
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I'd say if you suspect them of being fakes cut one open and post pics. Without some hard numerical data or actually seeing what is inside, we would have virtually no way of knowing. Just because you can't find a retailer that sells that exact brand, value and style of cap does not always mean it is a fake. What has got you feeling suspicious?
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Old 27th March 2013, 05:09 PM   #3
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If I am sure that they are fake, I'll definitely rip it apart and take some pictures.

They look real to me, that's why I got them. What got me suspicious is I can't find any info on them.

Then after looking at the fake photos where they encase a cheap cap with known make, they seem to have one thing in common, which is the black plastic top. With my limited experience, I have never came across a cap with the black plastic top. But as I said, my experience are limited.
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Old 28th March 2013, 01:42 AM   #4
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I think they are fake.
The USP series are discontinued and existed only in 85 Deg,
see ( scroll to the bottom, Large Can Type Aluminum Electrolytic Capacitors ) :
RUBYCON CORPORATION
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Old 28th March 2013, 03:59 AM   #5
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For the first one, I think so too, thanks.

For the second one, it was from a different store. As said I can't find anything on it, I have no clear reason to suspect it is one or the other. But my feeling is they are fake too.
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Old 28th March 2013, 05:46 AM   #6
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Did I just ruined a perfectly good capacitor?

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What do you guys think of the construction? The liquid is kind of frozen underneath, is this how it is supposed to be? I wonder what is the purpose of that black plastic disc on top of the cylinder?

Last edited by Navyblue; 28th March 2013 at 05:49 AM.
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Old 28th March 2013, 06:07 AM   #7
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Quote:
Originally Posted by Navyblue View Post
Did I just ruined a perfectly good capacitor?
The Rubycon is a probably a fake, the Samsung (now called Samwha) is real. Samwha makes middle-of-road general-purpose and industrial grade stuff, not particularly renowned for audio.
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Old 28th March 2013, 08:22 AM   #8
JMFahey is offline JMFahey  Argentina
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Who cares anyway?
Do they measure well or not?
As in capacitance/voltage/ESR/etc.
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Old 28th March 2013, 08:38 AM   #9
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I care, and people who share the same roof as me probably do too.

If nobody cares, why do you care if they measure well.
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Old 28th March 2013, 09:23 AM   #10
SY is offline SY  United States
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I think he means, why do you care if it's "really" Brand X if it works properly?
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