Bipolar capacitors...replacing BG NX

MiiB · 11th November 2010, 09:18 AM

I have previously with great pleasure used Blackgate NX-HiQ bipolar capacitors at a few places in my amplifiers.. but now.. they are no longer available....

What is your take on a good replacement..??
I need something like 33-47 uF in low voltage 6.3 V ....I know i can use film,, but I don't have the space...

I have tried with cheap multicomp's paralleled with 1uF film...but it's not really the same...

martinbls · 11th November 2010, 09:25 AM

Hi!

There you go:
Nichicon Capacitor Series ES

Regards!
Martin

MiiB · 11th November 2010, 10:40 AM

thanks.... and Rybycon, Panasonic or Sanyo.. are there valid types there...?
and how do they sound vise compare..??

Can't locate any European outlets for Nicicon ES series...

WuYit · 11th November 2010, 03:42 PM

Hi,
common electrolytic capacitors are not optimized for linear frequency response and wide operating frequency range. Testing is the only way to know, I`m afraid.

bob91343 · 11th November 2010, 04:52 PM

I seriously doubt you will be able to tell the difference among the various capacitors. Pick one and go with it.

MiiB · 11th November 2010, 08:19 PM

One thing is engineering and specifications.....another is the sound....damping or not damping. mechanics.... plastics..legs.. how the foil is terminated...a lot of things has impact...and capacitors differs tremendously....I know because in my loudspeakers Raidho Acoustics I have tested a lot of different types and brands. We have found that the solid tinfoil-polypropylene type we use is vastly superior to any other type we have tested. It simply much calmer solid and resulted in treble than the other alternatives...and pretty much regardless of cost

Same was the case with the NX-HiQ... it did the same..open and calm at the same time...maybe the tinfoil will be fantastic but making a 22 uF tinfoil is not possible..and would take way way too much space

I guess there's no shortcut....so testing must be the way forward....

WuYit · 12th November 2010, 12:10 PM

MiiB,
I agree with you 100%. Nonmetalized film is better than metalized film. What is the role of that cap?

AndrewT · 12th November 2010, 12:25 PM

Quote:

Originally Posted by WuYit

Nonmetalized film is better than metalized film.

metal foil and film are different from metalised film.

They are simply different and designed to be different to suit different usage.
Select which better suits your proposed usage.

WuYit · 12th November 2010, 01:17 PM

Andrew,
as I said, plain film and extended foil is better than metalized film as it gives lower inductance and ESR. Of course they are different.

AndrewT · 12th November 2010, 01:22 PM

Wuyit,
both your statements are untrue.

For example,
I am looking for a self healing capacitor that can meet the X1 specification to attach across the mains leads in my new gear.

I'll bet you will have a difficult search trying to find a film foil that is better for this duty.

Select the type to suit the usage.

11th November 2010, 09:18 AM	#1
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	Bipolar capacitors...replacing BG NX I have previously with great pleasure used Blackgate NX-HiQ bipolar capacitors at a few places in my amplifiers.. but now.. they are no longer available.... What is your take on a good replacement..?? I need something like 33-47 uF in low voltage 6.3 V ....I know i can use film,, but I don't have the space... I have tried with cheap multicomp's paralleled with 1uF film...but it's not really the same...

12th November 2010, 01:22 PM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Wuyit, both your statements are untrue. For example, I am looking for a self healing capacitor that can meet the X1 specification to attach across the mains leads in my new gear. I'll bet you will have a difficult search trying to find a film foil that is better for this duty. Select the type to suit the usage. __________________ regards Andrew T.

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11th November 2010, 09:25 AM	#2
martinbls diyAudio Member Join Date: Feb 2009	Hi! There you go: Nichicon Capacitor Series ES Regards! Martin

11th November 2010, 10:40 AM	#3
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	thanks.... and Rybycon, Panasonic or Sanyo.. are there valid types there...? and how do they sound vise compare..?? Can't locate any European outlets for Nicicon ES series...

11th November 2010, 03:42 PM	#4
WuYit Banned Join Date: Oct 2010	Hi, common electrolytic capacitors are not optimized for linear frequency response and wide operating frequency range. Testing is the only way to know, I`m afraid.

11th November 2010, 04:52 PM	#5
bob91343 diyAudio Member Join Date: Mar 2010	I seriously doubt you will be able to tell the difference among the various capacitors. Pick one and go with it.

11th November 2010, 08:19 PM	#6
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	One thing is engineering and specifications.....another is the sound....damping or not damping. mechanics.... plastics..legs.. how the foil is terminated...a lot of things has impact...and capacitors differs tremendously....I know because in my loudspeakers Raidho Acoustics I have tested a lot of different types and brands. We have found that the solid tinfoil-polypropylene type we use is vastly superior to any other type we have tested. It simply much calmer solid and resulted in treble than the other alternatives...and pretty much regardless of cost Same was the case with the NX-HiQ... it did the same..open and calm at the same time...maybe the tinfoil will be fantastic but making a 22 uF tinfoil is not possible..and would take way way too much space I guess there's no shortcut....so testing must be the way forward....

12th November 2010, 12:10 PM	#7
WuYit Banned Join Date: Oct 2010	MiiB, I agree with you 100%. Nonmetalized film is better than metalized film. What is the role of that cap?

12th November 2010, 01:17 PM	#9
WuYit Banned Join Date: Oct 2010	Andrew, as I said, plain film and extended foil is better than metalized film as it gives lower inductance and ESR. Of course they are different.

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