Duelund cast Pio Hybrid Copper/Silver or Rs series with Silver Bypass PIO

Zipost, 
I use the Duelund CAST copper capacitors in my Coincident speakers at the tweeter crossover and as output capacitors in my Yamamoto YDA DAC with superb results. I'm thoroughly satisfied with these upgrades. 

From what I have read from those who have done actual listening comparisons the addition of silver seems to improve performance even further yet.  I personally have no direct comparison experience but I don't doubt the impressions of those who do. 
Charles 

For your use I would stick with the copper CAST. They are wonderful. I am not sure you need to add the bypass silver cap to be honest. Sometimes resolution can be taken too far and long term listenability can suffer. Many recordings are less than perfect 😁

I agree with EriK on the copper Duelund CAST and even the RS as my go to choice. Also, sometimes adding a bypass cap in high voltage electronic applications gives a strange sort of result. Sometimes it can be good and sometimes not as good. Crap shoot and with this kind of money I would not take the risk. Stick with one high quality cap and you may well be better off.

Lastly, don’t discount the Jupiter copper foil cap. I actually like it every bit as much as Duelund copper CAST and they cost far less. Sonic Craft has great prices on these wonderful caps. The Humble Audio site rates the Duelund caps a little higher, but remember these were only tested in low voltage crossover networks, not electronics for coupling. I have compared both in coupling positions and the Jupiter copper foil caps were wonderful. The CAST copper were also wonderful. The Duelund is quieter with a dead silent background. They also had a very slight emphasis in the upper midrange. The Jupiter caps had more air, improved Micro details, and were more even handed through the upper mids. 

Food for thought!

i just want to kindly thanks for all who responded to my questions.    Your advise and input helps alot and will make me understand more about caps, and let me decide which will works best with my application.    Your info are greatly appreciated!

grannyring...

the Jupiter copper/oil wax,  I like the fact that Jupiter doesn't use oil but wax instead.  I find that Oil in cap ( Jenson copper oil) was a bit slow for me.  Here is my dilemma!!  I am trying to find the right cap for my tube cd player.    The design is base on a triode output tubes, the coupling cap calls for a 1.5uf, 450v.   I spoke with the Manufacturer, he recommended that i do not use paper/oil.   

So my question:  Should i stick with the Duelund Rs series or Jupiter copper/wax?? 
Or just ignore his info and buy the top of the line Duelund cast PIO hybrid!  

Hi Zipost,
As I wrote above the Duelund CAST are excellent choices. I also have the Jupiter copper foil capacitors in my Coincident 300b SET amplifier that replaced the Solen capacitors for input coupling . Just as Grannyring wrote, these are excellent as well. The truth is that you simply cannot go wrong with either.

I’m very happy with both. If forced to choose only one I’d give a "slight " edge to the Duelund CAST (such a beautiful and natural midrange and yet without any weaknesses across the audio spectrum). Grannyring would I suspect give that slight edge to the Jupiter 😊. Summary,  you'll be very pleased with either is my belief. 
Charles

Curious as to why the builder said avoid PIO caps? Yes the Jensen caps are warm and a tad slow, but nice overall. Not all PIO caps sound the same however. If you love speed, resolution and air, then go for CAST hybrid! If that is what you are shooting for you will get it with the hybrid from Duelund.

I have compared Jupiter copper foil directly to Duelund copper CAST only. I compared in the same gear and in the same position so I have a good handle on the sonic differences. I did this in a tube dac, tube preamp, and tube amp coupling positions. My comments in the previous post should help you decide.

If money is no object and you want ultimate resolution, speed, detail, air etc... then the Hybrid is your best choice. All Duelund caps have this in common as well as a dead quiet background. They, like all PIO style caps, sound very real and less plastic or artificial. The Jupiter caps share this real sound and avoid sounding electronic. Duelund caps sound a tad richer then Jupiter. But I must point this fact out. Duelund CAST copper caps do highlight the upper mids and that in the end forced me to go for the Jupiters which sounded more even handed throughout the sound spectrum. My ears are very sensitive to upper mids due to my tinnitus. Some will prefer this upper mids presence and you must know your preferences. On good to great recordings the slight emphasis on the upper mids is a nice thing. However on less quality recordings it can become a tad irritating. Also, what kind of music you listen too is also important.