Charles for electronics go with Jupiter. Just better in tube amps and preamps based on my experience as well as at least 5 others who replaced CAST with Jupiter copper caps.
I have not used them in a phono stage, but have had SOTA results in my tube amps and CD player. They are more even handed top to bottom, have more air and improved micro details. I also find them a tad smoother in the upper mids.
Both would be a big improvement if your amp has a Solen cap or something of like quality.
I know builders now using Jupiter instead of Duelund based on SQ only.
I have not used them in a phono stage, but have had SOTA results in my tube amps and CD player. They are more even handed top to bottom, have more air and improved micro details. I also find them a tad smoother in the upper mids.
Both would be a big improvement if your amp has a Solen cap or something of like quality.
I know builders now using Jupiter instead of Duelund based on SQ only.