Bi-Polar Capacitor Help Needed

Apogee · 02:37 PM

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

gk7 · 3rd November 2010, 03:01 PM

They are bi-polar. Where did you see a polarity marking ?

Zen Mod · 3rd November 2010, 03:17 PM

every current film cap is non-polarised

bob91343 · 3rd November 2010, 05:42 PM

That is not electrolytic. Just a paper or plastic dielectric, easily found in many styles and brands for low prices.

Apogee · 3rd November 2010, 05:55 PM

Quote:

Originally Posted by gk7

They are bi-polar. Where did you see a polarity marking ?

Quote:

Originally Posted by Zen Mod

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

gk7 · 4th November 2010, 09:17 AM

Ah I see. The dash indicates the voltage rating is DC (63 - = 63 V DC).

frags · 01:56 PM

Quote:

Originally Posted by Zen Mod

every current film cap is non-polarised

I know there are some maniacs who believe in uni-direction/polarization of wires and resistors.

bob91343 · 5th November 2010, 04:31 PM

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.

Apogee · 7th November 2010, 07:56 PM

Thanks to all for the help and input.

I appreciate it!

Best regards,

Steve

3rd November 2010, 02:32 PM	#1
Apogee diyAudio Member Join Date: Feb 2002 Location: Tacoma, WA	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 __________________ "If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once a week." - Charles Darwin Last edited by Apogee; 3rd November 2010 at 02:37 PM.

3rd November 2010, 03:01 PM	#2
gk7 diyAudio Member Join Date: Oct 2007 Location: Vienna / Austria	They are bi-polar. Where did you see a polarity marking ? __________________ Regards, Georg

3rd November 2010, 03:17 PM	#3
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	every current film cap is non-polarised __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb

4th November 2010, 09:17 AM	#6
gk7 diyAudio Member Join Date: Oct 2007 Location: Vienna / Austria	Ah I see. The dash indicates the voltage rating is DC (63 - = 63 V DC). __________________ Regards, Georg

7th November 2010, 07:56 PM	#9
Apogee diyAudio Member Join Date: Feb 2002 Location: Tacoma, WA	Thank you! Thanks to all for the help and input. I appreciate it! Best regards, Steve __________________ "If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once a week." - Charles Darwin


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3rd November 2010, 05:42 PM	#4
bob91343 diyAudio Member Join Date: Mar 2010	That is not electrolytic. Just a paper or plastic dielectric, easily found in many styles and brands for low prices.

5th November 2010, 04:31 PM	#8
bob91343 diyAudio Member Join Date: Mar 2010	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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