JAM by Duelund

I have compared Jupiter copper foil to the RS and CAST. I just prefer the Jupiter by a wide margin over the RS. The RS sounds dark compared to the Jupiter. The Jupiter is more open, airy and better micro details. It does this always with a natural richness and smooth presentation. The CAST as very good and I find the Jupiter a little better in the micro details and airy top end while the CAST is a tad more organic and midrange resolving.

The Jupiter’s are far more affordable than the CAST however. My all time favorite is combining a Jupiter copper foil with a Duelund Silver foil bypass cap. Pure heaven and better than the CAST for less money still. All my opinion😁.

The JAM are not at the same level as the Jupiter copper foil just by where they are in the Duelund Line and how Jupiter compares to the CAST higher up in the line.

Hi grannyring,

Thank you for reply!

Now I’m using Audio Note Copper capacitor in EAR834 phonostage between first and second tube. This capacitor works in the circuit without feedback. So the quality of this capacitor should make a big difference.
The problem is AN Copper are very lush and sweet in a mid-range like Duelund Custom-CU, or even more!
And I like the tonal balance of my phonostage. I just want to make it more transparent.
I afraid that Jupiter Comer can make vocal sound a little bit thin.

Regards,
Alex.

Jupiter is far from thin sounding as an FYI. It is lush, sweet, and has full bodied tone. Still my favorite! Better bass than Duelund in electronics also. That has been my experience. 

How much time does take burn-in of Jupiter?
Do they sound bad during burn-in like Duelund RS do?

Yes these well damped, large and dense caps all take a good 300-500 hours to fully burn in. They will sound good after 100 or so and just continue to open up a get better. The larger the cap value the longer....closer to 500 hours. Many don’t wait long enough and change things far too early. They will sound good right away and up to 50 hours. At 50 hours or so things go worse unexpectedly. Yes, frustrating but true. However at 100 hours or so they start sounding good again and just keep getting better with time. This has been my experience and trust me when I say I have been through this cycle many, many times and know from experience.

I wish this were were not true as some think. However, it is the case and real on these caps.