Tube Rolling for Rogue Audio Cronus Magnum 2


What is everyone using for the preamp tube and also down the line. Looking for articulate bass extended highs and sweet mids. Stock jj's are OK but I think I can do better. 
soundwatts
When I had a Cronus Magnum integrated, I used a NOS Mullard CV4003 for the preamp tube and Mullard reissued  12au7 and 12ax7 for the driver and splitter tubes.  I tried a RCA Cleartop for the preamp stage but liked the CV4003 better.

CMII owner here.  First I tried new Genelex Gold Lion 12AU7's and 12AX7's in all five slots.  A little bit better, but not night and day.  So then I got an Amperex Bugle Boy 12AU7 from Andy Bowman at Vintage Tube Services, and that also is better.  But I'm now still hankering to try a vintage Mullard in the pre-amp position, as stereo5 did.

I also splurged on new Genelex Golden Lion KT-88s to see how they sounded in comparison to the KT-120s, and after a week the 120s are back in the sockets.  More impact, more bass extension, and only very very slightly less sweet.  No reason (now, I discover) to change these.

So, my experience to date: the stock JJ's are not such underachievers as they are sometimes made out to be.  But with some expensive NOS small-signal tubes you can certainly improve and tweak the sound.



Thanks for the responses. I also heard that the cifte NOS 12au7 is very good. Has anyone heard these? 
I am also running a Cronus Mag 2 with a Millard cv4003 and 2 Tele 12au7, also tried 3 Tele in all 3 positions but like the 4003 in the middle. Using KT 120s.
This is a very very nice integrated!!