Tyson, you inspired me to check out the Jupiter caps on my custom-made VTA M125 monoblocks. I heard an immediate increase in soundstage. Singers seemed to have dropped back a few more feet. But at the same time something was off. I'm sure they just need to break in. Not looking forward to breaking them in but at the same time appreciating the positives now.
Yes, they take about 500 hours to fully burn in. Some things sound immediately better (details, clarity), other things will sound wonky for the first 100 hours or so. The Jupiters are weird, thy go from sounding very open, to very muffled (but still smooth), to gritty, to harsh, and you're thinking "wait, I paid how much for these things????" But once you get through that, you're still not done! Because from hour 100 to around hour 200 they stop sounding actively bad and now sound actively mediocre. You'll spend a lot of time thinking "Wait, these caps aren't bad but they certainly aren't great, they sound kinda meh". Push through that. After 200 hours they start to improve and they just keep getting better and better and better till around 500 hours then they level out.
Only caps I've had that were as bad for burn in were the old Black Gate electrolytics that were used in power supplies. Those took forever too and they would sound downright nasty at times.
Anyway, you might want to put in some cheap tubes in your amps during the burn in process. I keep several Sovtek, Svetlana, new production Tung Sol tubes around for just this purpose.
Oh, and nice amps! I have the stereo version of those amps, they sound great. I imagine the monos sound even better!