[maty]

https://www.google.com/search?q=diyaudio.com+miflex+kpcu-01

-> https://www.diyaudio.com/forums/parts/331927-kzk-white-line-capacitor-review-russia-love-music-post5969552.html

-> https://www.diyaudio.com/forums/parts/331927-kzk-white-line-capacitor-review-russia-love-music-post5986820.html

...The ClarityCAP CSA alone is natural but edgy, definitely not good. The ClarityCAP CSA+KZK K78-34+Miflex KPCU-01 gives the best harmony.
 
I also tried only the ClarityCap CSA+KZK-K78-34 but was missing the micro detail with the soundstage and the global warmness. Yes, the Miflex is very important and with such a small value is a strong influencer in the sound.

The result:

Extremely butter-liquid-silky smooth with huge soundstage, with rich organic micro fine detail. Unbelievable experience. We listened many different kind of music, classical, jazz, disco, latin and simply fantastic. We always turn the volume up

[maty]

https://www.google.com/search?q=audiocircle+miflex+kpcu-01

-> https://www.audiocircle.com/index.php?topic=54218.msg1751828#msg1751828

[Speedskater]

Remember that there are differences between CAD capacitors, resistors & inductors and real world capacitors, resistors & inductors.

[maty]

I know very well but I did not expect such an impressive improvement. Better than before yes but not so much! In other audio systems less optimized than mine (very optimized ALL componentes, Win10 too) and with recordings of lower quality and dynamic range I guess the differences will be smaller. It is evident, to me, that Bennic's yellow condenser, as usual in many crossovers, was acting like a big bottleneck.

That is why I bought Mills resistors, because they have very low inductance. The problem with all these expensive audiophile components is that they do not specify the values that make them superior. That is, in addition to the resistance they should publish the value of the residual inductance of the resistor and thus be able to emulate it in the software before the purchase.

[maty]

To finish with the resistors off topic, days ago I commented about the importance of low inductance in the BIG resistors used to make measures -> it can changes the THD+N values up to 6 dB!

https://www.diyaudio.com/forums/solid-state/344540-alpha-nirvana-39w-8ohm-class-amp-post5981618.html

BIG IMG: https://clk.works/wp-content/uploads/2018/10/img_5b0780d0a980e.png

[maty]

I am listening:

Various - Saturday Night Fever (The Original Movie Sound Track) (1977), Vinyl, RSO, US

https://www.diyaudio.com/forums/music/6958-playing-listening-post5998156.html



And the sound improvement is incredible. You have to listen to it to believe it.

[rollo]

 While the Milfex are VG the Duelund is just better overall. Do not like the forward presentation. Does not sound linear to me.


charles

[maty]

It will depend a lot on the system I think. I usually listen in the near field with this second system. The small coaxial of the KEF Q100 creates a great soundstage.

One of the limitations is that it not was depth, something expected from the near field. These weeks I have achieved the depth I wanted so much all this time. Last week I got a little more after retouching the amplifier, hence it took a week to make the bypass, to get used to the new sound and that it had stabilized.

Which Duelund to make bypass? With value about 22 nF.

https://www.hificollective.co.uk/components/duelund_capacitors.html

Only I can see minimum 0.1 uF, aka 100 nF. And they cost ten times more, almost twenty!!!

[maty]

Here, 0.01 uF.

https://www.hificollective.co.uk/components/duelund-pure-silver-foil-precision-bypass-capacitors.html

-> https://www.hificollective.co.uk/catalog/duelund-pure-silver-foil-precision-bypass-capacitors.html  € 107 (Brittish VAT included)

http://www.humblehomemadehifi.com/Cap.html

Duelund Silver Bypass Capacitor 0,01uF / 100VDC - 2% tolerance

Technical specifications (according to manufacturer): "Precision Speaker Capacitor; Pure Silver Foil; handmade in Denmark".

Sound: In one word: amazing! I have used these 0,01uF pure silver foil capacitors as bypass capacitors in many different systems. In just about every case there was an improvement in overall coherency and realism of tone. With realism of tone I mean that acoustic instruments and vocalists seemed much more tangible, more intimate. The Duelund Silver Bypass Capacitor brings out a certain harmonic richness in overtones, for example with brass wind instruments the tone gets a sort of "glow" making them so much more realistic. Big-band music is bright and warm at the same time if you know what I mean, just like in real-life. And now for a cliché: the Duelund Silver Bypass Capacitor really does remove a curtain from the sound, creating more depth, insight and it generally does a very good job in cleaning things up. It does this without getting harsh nor adding artificial emphasis on any part of the spectrum, something that can happen with certain types of bypass caps.

They even scared me once: my personal reference system uses a 1-inch beryllium compression driver connected to a tractrix horn that flares out to 29 inches. This "tweeter" has no resistors in the signal-path and is driven by a first order network, so only one capacitor in the direct signal-path. It works like an acoustic magnifying glass. I was fiddeling around as usual, tuning the value of this capacitor in steps of 0,10uF but the sound didn't quite seem to fall into place how I wanted it to. Then I decided to listen if the 0,01uF Duelund Silver Bypass Capacitor could help out here. Bingo! Makiko Hirabayashi's recording "Surely" (that I know very well) has some small bells that are used on several of the tracks. I thought I knew how they sounded but with the bypass capacitor in the network the bells were so realistic, it scared me I am so pleased with these universal bypass capacitors that I have decided to keep them in stock.

Verdict: add about 2 points to whatever capacitor you are bypassing

[SET Man]

I just ordered some Miflex KPCU from Sonic Craft, so they are back in stock.  Last thing I need is some more capacitors, but oh, well...

Hey!

   I tried to order a pair of .22uf KPCU with their "L2" matching but no stock show on the cart page. I emailed Sonic Craft and got a quick respond stated that they just don't have enough to do a matched pair for me right now for that value.

While the Milfex are VG the Duelund is just better overall. Do not like the forward presentation. Does not sound linear to me.


charles

    Charles, Duelund caps are crazy expensive. Wish I could afford them and have room for them. Anyway, I'm not a fan of forward presentation also. And I've read the "Humble Homemade Hifi" cap comparison and they mentioned about that also. So, Jupiter caps are still on the table for me. But Milflex are not expensive, I might buy them too and see which I like better in my amps.

My modded KEF Q100. Before with very cheap NOS Styroflex / Polystyrene 0.010 uF 600Vdc as bypass.

And Würth 150 kHz 8 mm ferrite.

.....

   Good job on speaker upgrade Maty but I'm not sure how this will help with my search here for coupling caps to be use in my SET amps.

    By the way, I really don't have use for caps, inductors, resistors for my speakers anyway..., except one 0.47uf for high pass to my supertweeters.

Buddy

[maty]

See if I am skeptical -by formation- that I still maintain the original wiring. In his day I selected Neotech at the request of Danny Richie but I did not make the purchase because I was satisfied with the cheap NOS styroflex.



When I change them, I have selected with the logic, that is, thinking about the inferences -> star quad geometry. Cheap Canare 4S11, like very expensive (with very good measurements in Canadian site) floor US loudspeakers.

Star quad, the best geometry to build audio and power cables
https://www.audiocircle.com/index.php?topic=156793.0


BTW: First I have heated the Miflex copper legs, I have smeared with flux and I have welded with normal tin.

[maty]

Only if you have caps in the audio-path of your amplifier, I guess it is with tubes and not Direct couple.

Picture?

Gainclone with LM3886 with an audiophile/boutique cap. Here you can bypass with Miflex 600Vdc 0.022uF the cheaper cap and you spend money.

https://www.diyaudio.com/forums/chip-amps/234032-my_ref-fremen-edition-build-thread-tutorial-post3901718.html




Don Sach's DS2. Custom 6SN7 Preamplifier

http://www.dsachsconsulting.com/custom%20line%20stage.html

My latest and greatest version features OLED display and relay input switching. It can only be built in the cherry or walnut case. The special model has every option. (photo with large display at right)

• 64 step remote Khozmo attenuator
• relay input switching, one xlr input and 3 rca inputs
• Duelund wiring
• all film cap power supply
• Polish oil caps on output
• 4 CV181-T tubes included

BTW, we can see a RF/EMI inlet filter too at mains input

[maty]

By the way, I really don't have use for caps, inductors, resistors for my speakers anyway..., except one 0.47uf for high pass to my supertweeters.

My older Big 3-ways (1991), rear bass-reflex, paper cones, 91 dB with supertweeter -aligned with rear bas-reflex- (18.1 kHz), full-range (950 Hz) and woofer 27 cm / 10.6" scheme and... kidnapped by TV, family and bad recordings. I know, very strange.

Image updated. Older was wrong!



Hummm, maybe the supertweeter is inverted.

It does not make much sense, for now, to improve the components or create a new filter. Or to buy new loudspeakers (KEF perhaps). Better a second system.

[maty]

The last picture, DAC output.

https://www.hificollective.co.uk/blog/dac-output-stage-capacitor-sound-test.html

"I'm guessing this test isn't much about duelund or Mundorf sio,...everyone knows they are amazing.

Miflex is the new cap on the block and it's OK on its own...but the midrange is quite shy and top end slightly highlighted so it's not so well balanced to my personal opinion.

But it has the best bass out of 3 caps!.

Bypassing Miflex 0.47uf with Jupiter copper 0.047uf....fixes that problem.

You will get great midrange of Jupiter copper !amazing 3d sound stage and bass to die for."

But the final value is different too: 0.47uF + 0.047uF = 0.517uF

Again, better 1/100, I think.

[maty]

I am creating a purchase to estimate the cost based on the components chosen in hificollective.co.uk for the Big 3-ways and I only can order one Miflex KPCU-01 0.022 uF !




Without electrolytics (68 uF), maybe:



Miflex with VAT: 18 €. 77 + 18 = 95 € at home.


* The important cap: 68 uF of the full range, bypassed with Miflex KPCU-01 0.022uF.

* The 1 uF (supertweeter) bypassed with NOS styroflex 10nF 600Vdc of the coaxials.

* The woofer with Würth 150 kHz 8mm ferrites (I have two without use).

[maty]

To finish with the strange Big 3-ways, the SPL graph with and without super tweeter. Speakers simulated as 8.2 Ohms. LspCAD soft.





Without the super tweeter the sound is less airy. The simulation confirms it.

[maty]

Interesting info about super tweeter, by Danny Richie

How to add a super tweeter, or how not to
https://www.audiocircle.com/index.php?topic=161633.0

This Tuesdays Tech Talk is about speakers with two tweeters
https://www.audiocircle.com/index.php?topic=164641.0

[maty]

https://www.diyaudio.com/forums/tubes-valves/346373-cheap-coupling-cap-post6003696.html

EFD RA31 capacitor condenseur - Google Search

-> [PDF] https://exxelia.com/uploads/PDF/59bac6f55a3ad.pdf

[maty]

Amazing improvement.

Alberta Hunter - Amtrak Blues (1980), Vinyl, Columbia, US

https://www.diyaudio.com/forums/music/6958-playing-listening-post6006775.html



DR14

******* ********

Tomorrow I will change the Bennic resistor with Mills 5 watts. The same person will be with me as when I made the previous changes in KEF Q100 crossover to verify if we are both able to notice change -how much, one or none.

[Jon L]

Received Miflex KPCU 0.22 uF 600V caps, and right off the bat, there are two HUGE problems:

1:  Miflex is gigantic compared to other 0.22 uF caps, much larger than Jupiter Copper or VH CuTF, larger than Duelund CAST.  It will not fit where I intended to place them 
2.  To make matters worse, Miflex is radial design, which makes it even more difficult to fit in many places designed for axial caps.

Sonic Craft does not allow returns on passive components (which I understand for a small company), so I am looking for someone who may want to trade a pair of used Jupiter copper 0.22 uF/600V with my brand new pair of Miflex 0.22 uF/600V caps.  I can throw in a pair of some other caps (like a nice pair of Vishay Roederstein MKP-1839 bypass caps or something).   

MiflexJupiter by drjlo2, on Flickr