JAM by Duelund

I received Jupiter capacitors and start running them in Frybaby2.
I think 3 days of a fast burn-in will be enough.

 I burned Jupiter Copper 3 days in Frybaby2.
I soldered capacitors into my phono-stage and listened. After that I connected Frybaby2 to phono-stage and run it about one hours. This extra hour didn’t do any difference.
The tonal balance after installing new capacitors was even. It looks like capacitors path about 90% of break-in.
Compared to Audio Note Copper capacitors that where before in phono-stage, Jupiter capacitors have more high frequency extension and bigger base. They have much more resolution in all frequencies spectrum included lower midrange. All violins, saxophones, trumpets have more body and midrange tones. Soundstage became more 3d and further.
Arensky trio with Heifetz- Piatigorsky sound more energetic and emotional. Most of jazz music sound more real. But on rock music Jupiter capacitors show more records flaws too.
I can compare Jupiter Coper to Duelund Custom Cu capacitors directly. But I changed Audio Note to Duelund Custom Cu in my integrated amplifier, so I can compare Jupiter Copper to Duelund Custom Cu capacitors indirectly. This comparison is based on my memory and not too accurate.
Duelund Custom Cu capacitors have bigger, deeper and slower base. Jupiter Copper capacitors sound faster and very energetic. Duelund Custom Cu capacitors have lusher, richer low midrange on vocals. Duelund Custom Cu maybe a little better in term of tone.

They do need more time to break in with music.  500 hours with music. Pretty sure your cooker time fell short of that. These do take all of 500 hours to sound their best. Not sure what the cooker equivalent of 500 hours is? Not sure if it even gives the same result? 

Yes, I'm agreed. Cooker works different compared to break in with music.
Very long  break in with music always makes sound better and long break in with cooker sometimes makes sound too dull or bright.
But in this case with Jupiter capacitors, cooker helped me to pass quickly the most annoying first stage of the break in.
I ordered a pair of 1uF Jupiter Cu capacitors for my phono-stage (build based on EAR834 schematics) output stage.
The thing that impressed me most in Jupiter Cu is exceptional micro-dynamic that makes classical music sound very emotional.

Yes that is a wonderful thing to get most of the burn in behind you once a part is put in place. I do wish a had such a device.