Capacitor Question

[Ron Resnick]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

 

[Musica Bella]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

That’s a tough one. I’m going through the same thing right now for a high pass filter in our preamps. Finding a manufacturer or reseller that can can accurately measure and match capacitors of this size is difficult. I’m still doing some homework (and folllowing this post).

 

[Ron Resnick]

That’s a tough one. I’m going through the same thing right now for a high pass filter in our preamps. Finding a manufacturer or reseller that can can accurately measure and match capacitors of this size is difficult. I’m still doing some homework (and folllowing this post).

Please let me know the results of your homework!

 

[Robh3606]

Do they have 6000pf if so put 2 in series.

Why audiophile types? Those are standard values you can get film caps quite easily.

https://www.mouser.com/c/passive-components/capacitors/film-capacitors/?capacitance=3000%20pF

Rob

 

[raja11]

Please let me know the results of your homework!

You might want to consider some silvered mica caps from Charcroft. Tolerance is +/- 1%.

Charcroft Silver Mica Capacitors | HIFICollective

Please use the filter page to speed up your search Capacitor Filters

www.hificollective.co.uk

 

[Alrainbow]

Ron exact specs is difficult , but to achieve your goals you may need to buy a bunch and use a cap analyser to match them
It's what many people do for cross overs and other uses .
You can place them in parallel too but while many do this know the sound may not have your desired effect .
cross overs is perhaps a most difficult design and in most cases must be trial and correction in achievement.
A idea might be to get a cap that's not special order and test first , the tiny value you need is very small
Interconnects have more in most cases

 

[Ron Resnick]

How about RelCap RTE?

 

[raja11]

How about RelCap RTE?

They would do the job also. I haven’t compared them to the Charcroft, though.

 

[Ron Resnick]

Jeff at Sonic Craft is recommending RelCap RTE. But since I don't wade into DIY water frequently the only names I know for fancy capacitors are Duelund and Mundorf.

 

[raja11]

These are all somewhat fancy. Take your pick. In the pf range I’ve always preferred silvered mica, and Charcroft makes them in a fancy way, heh.

 

[aLLeARS]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

Wima FKP-2 film and foil capacitors are typically 2.5% tolerance. You could use four 680pf in parallel for 2700pf and three 1000pf in parallel for 3000pf. They are readily available and inexpensive. The higher voltage ones sound best and are one of the better sounding non-audiophile capacitors. Would be a good way to try your idea to see if you like it before spending $$$.

https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/6348/WIMA.pdf?_gl=1*1h4st3v*_up*MQ..*_gs*MQ..&gclid=EAIaIQobChMIs7re8MegjgMVGUr_AR01iSk5EAQYASABEgKC-fD_BwE&gclsrc=aw.ds

 

[microstrip]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

IMO if making DIY filters you should get a capacitor meter. They are inexpensive, and will save you a lot of time and effort. If you want to be sure of accuracy, get a few sample 1% capacitors just to perform calibration.

Remember that some high-end component suppliers perform component selection - the more accurate or matched components are sold directly to manufacturers (regular clients), the remaining are sold through other channels ...

 

[morricab]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

Sadly, I think you would have to order quite a few and then match them with a multimeter that measures capacitance. There are some brands with tolerances of +- 10 or occasionally +- 5%.

I was putting something down and then realized I was putting way too large values. You need 2.7nF or 3.0nF...quite small values! Are these for bypass duty then? If yes, then the tolerance is pretty unimportant because these are only a small fraction of the capacitance in total for the high pass filter.

 

[DasguteOhr]

2700pf 1%

https://www.mouser.de/ProductDetail/Cornell-Dubilier-CDE/CD19FD272FO3F?qs=nnhpPVbCybWd9dWqP0Ho%2FQ%3D%3D

3nf 1%

https://www.mouser.de/ProductDetail/Cornell-Dubilier-CDE/CD19FD302FO3F?qs=nnhpPVbCybUrkQ%252BsT4W5JQ%3D%3D

 

[Hornsolutions Swen]

Jeff von Sonic Craft empfiehlt RelCap RTE. Da ich mich aber nicht oft mit Heimwerkerarbeiten beschäftige, kenne ich für ausgefallene Kondensatoren nur die Namen Duelund und Mundorf.

Du könntest auch Clarity Caps, Jensen, Jantzen oder andere verwenden. Bei 2.700 pF würde ich es nicht so kompliziert machen und zum nächst passenden Wert übergehen. Also wahrscheinlich 2.500 oder 3.000 pF.

 

[DasguteOhr]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

you should have asked at Jensen right away, they make most of the capacitors for Dueland. Exsample jdm series hommage to jensen.

0.022uF JDM 600v Pure Silver

Conductive foil Pure Silver Lead out type Ø 0.8mm silver Tolerance -...

andersenaudio.dk

Mundorf capacitor are at Fischer&Tausche manufactured.by the way, excellent capacitors without high-end surcharge.

Produkte von FTCAP im WITTKO-Shop

Produkte von FTCAP (Fischer & Tausche) und vielen anderen Herstellern finden Sie im WITTKO Online-Shop unter wittko.eu.

wittko.eu

 

[mtemur]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

Dear Ron,

I think it’s highly unlikely that there would be a 20% variation in the values of Duelund capacitors. It’s more realistic to expect a 1–2% difference between them. Manufacturers usually declare a wide tolerance to avoid returns, but in practice, the actual variation tends to be much smaller.

That said, the exact capacitance value isn’t the most important factor when selecting a capacitor for the signal path. The most important thing is how it sounds.

I’ve used Duelund CAST Copper capacitors as coupling caps in a tube amp and compared them with several others. Even the Mundorf Silver Oil caps sound like garbage in comparison to the Duelunds, in my opinion.

So, I wouldn’t let the stated tolerance discourage you. If you do decide against Duelunds, you might also want to consider old Jensen copper or Jupiter caps—but to my ears, Duelund still sounds the best.

 

[Kcin]

Some good suggestions here. If you don't want to bother with measuring a sample size for your exact value then let the pros do it for you at the boutique vendors. If you're making first order crossovers the exact capacitance really does not matter too much as the slope of the curve is so shallow that you won't hear the effect.

 

[DasguteOhr]

Some good suggestions here. If you don't want to bother with measuring a sample size for your exact value then let the pros do it for you at the boutique vendors. If you're making first order crossovers the exact capacitance really does not matter too much as the slope of the curve is so shallow that you won't hear the effect.

However, he doesn't use it in a passive xover speaker. Instead, he uses it as an active filter before the power amp to block everything below 200 Hz. You have to be as precise as possible. There's nothing more precise than mica capacitors. Post#14

 

[Gregm]

I tried to custom order 2,700pF and 3,000pF capacitors from Duelund, from its CAST copper line, for a DIY high-pass filter.

Duelund says it cannot guarantee each capacitor any closer than 20% to the actual value requested. In theory I could have two capacitors that are 40% apart in value! I think this is ridiculous.

Who makes a high quality high-end audio capacitor with values of 2,700pF and 3,000pF and some semblance of consistency?

Thank you.

Why not go for silver mica capacitors? Tolerances are as low as 1-2%