Now have approx. 30 hours in on the Jupiter HT output caps. Very nice - the change in sound quality is not subtle.
Other changes in my system - tube swaps and NH cable break/switch - may be clouding the waters.
That said, I'm getting what I wanted: Tone! Texture.
More presence and touch in mids - acoustic instruments more fleshy, yet natural and wrapped in airy highs.
So....the space they're in is more illuminated but the instruments aren't bleached out.
Your impressions are very much inline with my own experience with the Jupiters. Good to hear they have worked out well for you..
Ya, for me, I think ive squeezed enough out of the amp. Very very nice.
Be warned you will need to scratch that Mainline itch sooner or later