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I think that is right Lon and Dom. It is confusing to me, since as far as I can tell, Type I and Type II are Steve's names, not what is otherwise out there. I had to look around the amp pages to remember which was which. The CSP3 page description has good clues, calling the Type I "high resolution," and the Type II "higher resolution."
If you go to a cap seller, the Type I is called HT, and is aluminum, and the Type II is called Copper foil and more costly.
I liked the Coppers quite a lot when I first changed from stock HTs in the Torii IV. The HTs as I recall where really nice there, but by comparison, had more open sizzle in the upper mids/top, contrasting just a little with a slightly dark/thick on bottom to me. Where the Coppers are more solid, bigger througout, including the bottom, more resolving, more balanced overall to me.
But both have that Jupiter "organic" quality that ended up getting to me. I ended up relating it a little too much with a darkish/smooth affect than organic finally, especially with the coppers...finding the big bass a little too soft/big/full, and leaking into the mids a bit much for for my preferences. The top to me is sweet and resolving with smoothness, no complaints there.
But after trying a bunch of other well liked caps, I ended up not preferring the Jupiter balance as much, so much so, that I tried the coppers all over the place as bypasses, and there were several others I liked better, including the HTs, which to me are nice bypasses if you want to open the top. They mix really nicely with bypasses that are a little too warm. But after loads of attempts, the coppers sit in the drawer. That said, without comparisons, and my preferences, I think they are very sophisticated and nice caps, and of course a lot of what makes something great or not, is how well it blends with the rest fo the voicing!
After trying so many, if I had to pick one, it would likely be Miflex Copper Oils. They are to me, just a little less resolving on top than Jupiter coppers, but I am a fine detail lover, and I didn't find them lacking. I did discover a great bypass for them though to bring out the top more. Very low cost Mallory 150, 0.01 caps. Those little things just bring out a little more top very nicely with the Miflex sound here. The Miflex copper oils have a sweetish high quality copper oil tone that is more open and spacious than the Jupiter Coppers, but not as much so as Audyn Coppers, which are really nice in the right setting, but a little chilly/hardish to me compared to Miflex.
To me, the Miflex are more musically balanced than either Jupiter, less forceful and full/darkish than the coppers, and more evenly balanced than the HTs top to bottom, pleasantly open and revealing without being cool. Quite musical to me, they just seem to get it right in a lot of settings for my tastes.
And the small value Miflex caps are quite low cost for the quality! They are often on sale at Soniccraft, where it appears he may have switched from Jupiter to Miflex. I think Jeff is quite picky about the quality he gets from suppliers. I had had some leaking problems with my first batch of Miflex oils, bought from HiFi Collective in the early broader release days. I am able to solve it with glue, but seems they should be a little more solid in this regard. And this is in the heat of amps, they never leaked in speaker applications, and often not in amps. Anyway, Jeff at Soniccraft once told me he had not gotten complaints about leaking from Miflex he had sold....so things must have changed, or he has some magic with the company. They also make a nice Aluminum foil oil cap, and a copper/poly cap.
All that said, if you like the jupiter sound you have now, I bet upgrading to the coppers would be a very nice lift. It was here in the MKIV coupling caps.
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