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Old 1st December 2009, 08:45 PM   #1
RM1 is offline RM1  United Kingdom
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Default Old 1970 capacitor - can't identify

Hi,

I've recently opened some old Rotel speakers with the intention of replacing the crossover capacitors. Speakers are 2-way with 8" woofers and date from the 1970s. That's all I know.
I have located the capacitor on the crossover, and belive it is a non-polarised electrolytic type.
There is no code I recognise on the capacitor, only the folowing:
ZEID
5 / 24
Rver.

(Sorry, no picture).
It is metalic blue and the size of a cigarete butt (technical!).
Can anyone help me determine the value of this capacitor?

Thank you,

RM
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Old 1st December 2009, 11:07 PM   #2
Minion is offline Minion  Canada
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It is probably 5uF 24v , I know it is a wierd value but they used a lot of wierd values back in the day ... If you have a capacitance setting on your DMM you can test it to make sure .....


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Old 2nd December 2009, 09:14 AM   #3
RM1 is offline RM1  United Kingdom
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Thank you for your help.

You mention it is a weird value, but does it 'sound' like a correct value?

I'm afriad I know nothing of these parts.....

Aslo, I notice people mention caps with higher ratings, 100V and up.

Is it a good idea to replace like-for-like (24V) or to go for a higher rating?

Many thanks again,

Russ
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Old 2nd December 2009, 09:55 AM   #4
tomat is offline tomat  Indonesia
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Quote:
Originally Posted by RM1 View Post
Thank you for your help.

You mention it is a weird value, but does it 'sound' like a correct value?

I'm afriad I know nothing of these parts.....

Aslo, I notice people mention caps with higher ratings, 100V and up.

Is it a good idea to replace like-for-like (24V) or to go for a higher rating?

Many thanks again,

Russ

no problem replace with same 24v or going with higher voltage rating,as long as the capacitance value is the same,if the old is 5uf,replace them with 5uf too
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Old 2nd December 2009, 10:02 PM   #5
RM1 is offline RM1  United Kingdom
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Thanks a lot. I'll give it a go and hope it helps!

Russ
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Old 2nd December 2009, 11:05 PM   #6
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5uF is rare now. But 4.7uF is ubiquitous. It's a close enough match. Electrolytic caps - which that one is likely to be, given the voltage rating - have a tolerance of only 20%.
You might do better to replace it with a polyester or polystyrene type - they are physically big in comparison, and more expensive, but last forever.
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