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Old 14th August 2013, 10:37 PM   #1
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Angry Capacitor query L1 audio innovation pre-amp

Hi Guys, recently got stung buying an L1 audio innovation L1 pre-amp. To cut a long story short, I ended up with a preamp with a blown transformer which i managed to obtain a new one from the original supplier however while I am about it I decided to replace all the electrolytic Caps. So ordered from Farnel what I believed to be the correct specification however 2 of the caps in the pre-amp are vary large, yet the equivalent replacement ones from Farnel (panasonic) were much smaller in fact more than half the size.

The spec were

Rubycon CEW 385v 150uf (m) now the the best I could match to was a Panasonic 400V 150uf (increased voltage should be fine)

Rubycon 25v 6800uf which again i match to an exact panasonic.

Now I cannot guarantee they match the original spec as I could not fined details on the old one like current leakage etc but the replacements were the best I could get with high ripple current and operating temperatures.

thus, any one know the exact required specification ? will the ones I purchased be ok ? and why are the news ones so much smaller (i guess 15 years advance in technology but still a little surprised)

any help would be gratefully received.

Kind regards
Jim

Last edited by jocker; 17th August 2013 at 12:50 PM.
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Old 17th August 2013, 12:52 PM   #2
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can any one help ?
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Old 17th August 2013, 02:02 PM   #3
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Default Pourquoi?

Quote:
Originally Posted by jocker View Post
while I am about it I decided to replace all the electrolytic Caps.
First question: Why? Are they clearly damaged?
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Old 17th August 2013, 05:13 PM   #4
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yes, sadly they are. They are on the power supply circuit and I'm fairly confident this was what blew the transformer. Given that they are 15 years old I suspect they just exceeded their life.

I hope the above helps

Kind regards
Jim
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Old 17th August 2013, 05:22 PM   #5
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The L1 tends to kill the capacitors due to heat and ageing.
The Panasonic caps will last longer as they are a better specification.
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Old 18th August 2013, 08:46 AM   #6
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Quote:
Originally Posted by JonSnell Electronic View Post
The Panasonic caps will last longer as they are a better specification.
And there's the rub - decent capacitors will quote design lifetime at a certain temperature. The longer life/higher temp the better (and usually larger and more expensive)
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