Bi-Polar Capacitor Help Needed - diyAudio
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Old 3rd November 2010, 02:32 PM   #1
Apogee is offline Apogee  United States
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Default Bi-Polar Capacitor Help Needed

I am working on several Nakamichi PA-7's.

I am re-capping the small signal caps and am having trouble locating a 1uf 100v bi-polar electrolytic.

I am considering using the Wima MKS series as a replacement, but unsure if they are bi-polar. When looking at the pic, they appear to have a polarity marking, but since they're a film cap I'm unsure as I thought film caps were non-polarized. Anyone know if these will work?

http://www.wima.de/EN/mks2.htm

I'm trying to find a decent sounding replacement that was designed for audio. Unfortunately, I'm having no success as the "audio" caps don't appear to rated for high enough voltage.

Does anyone know of alternative suggestions that might be better?

My plan is to replace all other small caps with Elna Silmic series.

Any help would be appreciated!

Thanks,

Steve
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Last edited by Apogee; 3rd November 2010 at 02:37 PM.
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Old 3rd November 2010, 03:01 PM   #2
gk7 is offline gk7
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They are bi-polar. Where did you see a polarity marking ?
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Old 3rd November 2010, 03:17 PM   #3
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every current film cap is non-polarised
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Old 3rd November 2010, 05:42 PM   #4
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That is not electrolytic. Just a paper or plastic dielectric, easily found in many styles and brands for low prices.
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Old 3rd November 2010, 05:55 PM   #5
Apogee is offline Apogee  United States
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Quote:
Originally Posted by gk7 View Post
They are bi-polar. Where did you see a polarity marking ?
Quote:
Originally Posted by Zen Mod View Post
every current film cap is non-polarised
I thought the same also.

However, if you look on the link I posted, there is a dash following the value in the pic. I wasn't sure if the dash was depicting negative and it's not mentioned on the datasheet whether or not they are bi-polar.

Again, wasn't 100% certain, hence why I asked.

Thanks for the help!

Steve
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Old 4th November 2010, 09:17 AM   #6
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Ah I see. The dash indicates the voltage rating is DC (63 - = 63 V DC).
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Old 5th November 2010, 01:53 PM   #7
frags is offline frags  Canada
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Quote:
Originally Posted by Zen Mod View Post
every current film cap is non-polarised
I know there are some maniacs who believe in uni-direction/polarization of wires and resistors.

Last edited by frags; 5th November 2010 at 01:56 PM.
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Old 5th November 2010, 04:31 PM   #8
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A dash implies DC. It's not polarity. Sometimes a capacitor will have a black band near one end, which signifies the end that connects to the outside foil but that's not important in most cases.
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Old 7th November 2010, 07:56 PM   #9
Apogee is offline Apogee  United States
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Default Thank you!

Thanks to all for the help and input.

I appreciate it!

Best regards,

Steve
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