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After having ZMAs fully burnt in, and carefully tuned, new parts, especially good caps, I think it can be a little tricky. As has been mentioned, being used to burnt in amps in revealing systems, burnin is for real again after mods. Though ±100 hours seem to take care of most resistors, I find better caps pretty slow. I guess this may be part of odd experiences with some tubes. The way I hear it, relative to many others, Jupiter caps do sound pretty good pre-burnin, but they still move around through phases of less balanced, more muddled, to more balanced, complex, and clear.
I am using Miflex coppers for coupling caps in my Torii IV now, but below are my notes on Jupiter Coppers when I replaced Jupiter HT couplings with them. This was in late summer 2016. Luckily I have notes, but this fits my memory of other burnin cycles. My burnin helper, a Frybaby2, was newish then. Since, I have learned to use it better for pre-burnin, it is on incessantly. It helps me get a clear read on modifications quicker, allowing me to move on with relative confidence to the next experiment.
This exploration has verified the FryBaby2 is good indeed for getting through the rougher parts of burnin. From my notes:
"Jupiter Copper coupling caps replacing Jupiter HT’s:
I ran them on my FryBaby2 for a couple weeks which really helped, but I still continue to hear subtle changes 6 weeks later. The way I listen now, that is about 300-350 hours of amp time, and after over 300 on the burnin unit. I don’t know how the FryBaby relates hour-for-hour compared to amp time with caps, but I know it helps solve the hard parts of burnin with everything I have tried it on. I feel like the caps are pretty settled now but may possibly have a bit to go to reach their consistent potential.
To me, they sound more natural and real in every way than the HT’s in the MKIV. They have a greater sense of resolution...like there are more “particles” making the sound than the HT’s."
Music without an effective burnin rig, I have noticed 350 hours, give or take, for good caps to even up and start showing steadiness as they continue to improve. Then, there will likely be subtler shifts again in the ±600 range as they head into deeper refinement. Without that much time, there are likely still burnin oddities confusing the experience.
Now I use the Frybaby at least 3 weeks on more recalcitrant caps, then music. Even difficult Russian Teflon and Silver/Mica caps, after several weeks on the unit, tend to resolve after a week or so of fairly heavy music play. And less difficult caps start sounding pretty right within a several days of 6-8 hours of music/day, and pretty pain free along the way! ...a lot better for me than 300-600 of listening time!
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