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Old 23rd June 2008, 01:30 PM   #1
conor4 is offline conor4  United Kingdom
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Default 25v 40 micro farad capacitors

hi , i am looking for replacement capacitors for my beovox 3800 2 ohm speakers.
they are around 30 years old. i read in this*thread that replacing the caps might improve mid and upper range performance.



does anybody know a decent uk supplier (or overseas) that might sell this kind of thing? I had a look around a few sites but i couldnt find any that match the exact specs


http://forum.beocentral.com/viewtopic.php?t=60

Thank you very much!

Conor
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Old 23rd June 2008, 02:00 PM   #2
AMV8 is offline AMV8  United Kingdom
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Hi
Try Wimslow audio ( who specialise in speakers ) or Farnell ( who supply electronic parts )
I am not sure how familiar you are with electronics but you need a capacitor that is 25 volts or greater and 40 mf plus or minus 10/15 percent.
I would recommend changing all the capacitors if 10 years old.
Don
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Old 24th June 2008, 01:49 AM   #3
conor4 is offline conor4  United Kingdom
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thanks !

I didnt know that you could use higher voltages. hopefully my speakers will sound much better after.

Thank you.
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Old 24th June 2008, 04:51 PM   #4
AndrewT is offline AndrewT  Scotland
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40uF is an unusual value.
It might be worth trying 22uF+18uF to give the total value.
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Old 24th June 2008, 05:15 PM   #5
Did it Himself
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Try motor run capacitors, they come in 40uF. I got some for an active speaker project (basic tweeter protection), they are absolutely huge though and I think were about 8 each from CPC.
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Old 26th June 2008, 07:53 PM   #6
conor4 is offline conor4  United Kingdom
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i had a look at the wilmslow audio and the only 40 micro farad ones they had were 630 v

if i am only after 25 volt ones will these still work in there place? i dont want to compromise if i can.

If i were to add up the capacitance from two caps is that going to compromise on sound in any way?

thanks people , i really apreciate it. my speakers are good as it is but the upper frequencies could be better, hopefully this will help them out.

while i'm at it does anybody know of any decent amps capable of running 2 ohm speakers?
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Old 27th June 2008, 07:35 AM   #7
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by conor4
any decent amps capable of running 2 ohm speakers?
Krell and Krell Klones.
see the KSA50 thread. PCBs still available.
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Old 27th June 2008, 08:50 AM   #8
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It's perfectly fine to have more voltage capacity than you need in a cap, what you don't want is less.
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Old 27th June 2008, 08:54 AM   #9
h_a is offline h_a  Europe
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I'm not sure everybody here is aware that these parts are probably polypropylene caps (MKP) and these do not need to be exchanged after 10 years. That's about the rule for electrolytic caps.

Well, but that's DIY, so go for it if you want.

Far higher voltage ratings are no problem, need just much larger space.

All the best, Hannes
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Old 27th June 2008, 09:48 AM   #10
AndrewT is offline AndrewT  Scotland
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Quote:
i had a look inside and the one of the existing caps is a 40uF 25V capacitor.
I will guarantee that B&O have not used an MKP 40uF 25V in this speaker.
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