Yes, it is rated at 250V and 1.8uF is only available in that range and 250V is mucho plenty.
Hopefully this link works:
https://www.hificollective.co.uk/catalog/miflex-kpcu03-1-8uf-250v-kpcu-copper-foil-capacitor.html
Hopefully this link works:
https://www.hificollective.co.uk/catalog/miflex-kpcu03-1-8uf-250v-kpcu-copper-foil-capacitor.html
Yes, 90 Euros for 1.8uF, compare with 111 Pounds from the UK, and that's cheaper and UK more expensive, right?
Thanks for the response Joe - and no problem at all. I certainly greatly appreciate the fact that you're willing to continue to push the performance of these speakers and adapt to new circumstances - a large part of why I love these speakers so much. I admire your commitment to the design and look forward to continuing to follow the upgrades over time.
Hey Joe, yes used that email address. Just resent it now. Maybe went to a spam or junk mail?
Folks:
Okay, I'm intrigued. Pricing at AudioMiflex is considerably better than at HiFiCollective. I have been using Cornell Dubilier CD940C 0.01 uF 3000V caps to bypass Jantzen Z-Superior 1.8 uF caps in my MFC Elsinores. I also have 0.1 uF and 0.47 uF CD940C 3000V caps on hand. I could add Miflex bypass caps to my order if they were superior to the Cornell Dubilier caps. Tony Gee at HumbleHiFi is a fan of the Miflex KPCU-01 series, but would it serve well in a bypass position and what value would be ideal?
Your counsel is appreciated!
Regards,
Scott
Okay, I'm intrigued. Pricing at AudioMiflex is considerably better than at HiFiCollective. I have been using Cornell Dubilier CD940C 0.01 uF 3000V caps to bypass Jantzen Z-Superior 1.8 uF caps in my MFC Elsinores. I also have 0.1 uF and 0.47 uF CD940C 3000V caps on hand. I could add Miflex bypass caps to my order if they were superior to the Cornell Dubilier caps. Tony Gee at HumbleHiFi is a fan of the Miflex KPCU-01 series, but would it serve well in a bypass position and what value would be ideal?
Your counsel is appreciated!
Regards,
Scott
I have emailed my reply. I had to use my "joeras@bigpond.com" address, because my domain host for "customanalogue.com" is Crazy Domains and I have a problem sending emails to Google Gmail addresses, they just bounce back. I called Crazy Domains and they said they fixed it, and yet a month later the fault has come back. They say the problem is with Google. They bounced it because "it fails to pass SPF checks with the ip:... To best protect our users [you] from spam and phishing, the message [to you] been blocked." What is "SPF checks?" It seems that you need to be protected from me. 🙄
I knew that YOU knew. 😉 Yes, they told me something similar, my outgoing server had to be changed this end and now it is fine.
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Now for a loaded question:
Why do these caps sound different? And not just these. How/what is it that changes the sound?
Clearly the Miflex cap sounds significantly better to the TCM, so much so that I am now almost embarrassed to have recommended the TCM, so I feel on one side to have egg on my face, and the other (more importantly) that this is clearly an upgrade when switching to Miflex (same price).
So what is it? Or, what is it that a cap can do wrong?
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Now for a loaded question:
Why do these caps sound different? And not just these. How/what is it that changes the sound?
Clearly the Miflex cap sounds significantly better to the TCM, so much so that I am now almost embarrassed to have recommended the TCM, so I feel on one side to have egg on my face, and the other (more importantly) that this is clearly an upgrade when switching to Miflex (same price).
So what is it? Or, what is it that a cap can do wrong?
If two capacitors have different series resistance they will change the tweeter level a little. If it was too loud one capacitor would sound better and if it was too quiet, the other capacitor would sound better. So in that case it isn't the capacitor, but the overall circuit which is the issue.
Scott,
I would imagine you will want to use a small bypass cap like what you have, since a larger cap this can impact the crossover frequency. A 0.1 mF capacitor represents a 5.6% increase in the capacitor value outside the tolerance value and lower the crossover frequency by the same percentage. Obviously, the 0.47 uF cap Is not suitable. The smallest Miflex KPCU-01 series cap is 0.022uF, AudioMiflex says 0.027 uF is the smallest in stock and either is well within the main cap tolerance value. They are 20 Euro each, cheaper than the Duelund Silver Foil PIO. BTW, shipping cost is pretty high from AudioMiflex in relation to the cost of the capacitors, I am sure it make sense to put in a quantity order. Tony Gee says +2 points in performance for every bypass capacitor he tests, so again, I am not sure how much difference it makes over what you have already done.
Do you have an ULD build already? As I remember, I am around 2 hours away from you (I am in MD, you in PA). I will be finally starting on my ULD build in July.
David
David:
I was thinking along similar lines. I'm likely going to get a pair of the KPCU-01 0.022uF caps for bypass purposes; their price is low enough that it isn't a crazy addition to my order (even though Mr. Gee says of the Cornell Dubilier 940C 0.01uF caps "use them everywhere possible!"). I hope to be able to tell the difference.
My next speaker project should be Hamlets, not another pair of Elsinores, so it's unlikely I'll ever get around to building a ULD set. That said, I look forward to hearing about your ULD journey and your observations in comparing the two versions. And if you find yourself wandering aimlessly a couple of hours north, reach out?
Regards,
Scott
I was thinking along similar lines. I'm likely going to get a pair of the KPCU-01 0.022uF caps for bypass purposes; their price is low enough that it isn't a crazy addition to my order (even though Mr. Gee says of the Cornell Dubilier 940C 0.01uF caps "use them everywhere possible!"). I hope to be able to tell the difference.
My next speaker project should be Hamlets, not another pair of Elsinores, so it's unlikely I'll ever get around to building a ULD set. That said, I look forward to hearing about your ULD journey and your observations in comparing the two versions. And if you find yourself wandering aimlessly a couple of hours north, reach out?
Regards,
Scott
OK on that. I have some thoughts as well:
The cap has a reactance curve. Microphonics created by the AC current passing through the cap causes the reactance to change, depending on the construction and materials used (obviously mass and damping as well as no air gaps etc, these all come into play). As it is in series with the voice coil, then we have some kind AM, amplitude modulations, of the current. This ends up in the voice coil, and hence we hear it. Different caps will not all behave them same. Cause and effect would seem to exclude other explanations. What do you think?
Best cap? No cap! Alas, in this instance we need them.
Another pair of 1.8uF Miflex caps arrived today, these will end up in the ULD Elsinores here, give me about a week.