Kek,
I was pretty happy with my Rogue Magnum 99 right out of the box and it has only improved with use (~100 hrs now). I didn't perceive any significant sound change after ~25 hours of use. There was some tube break-in apparent over this time. My unit came with Electro Harmonix 6SN7s that many people claim to be one of the better currently manufactured tubes. I have not tried NOS 6SN7s yet in the main preamp but have rolled to Mullard 12AX7 and Amperex 12AU7 tubes for the phono stage and they made a significant difference. If you do some 6SN7 tube rolling, I would be very interested in the results.
Nolan
P.S. The rest of my system is Magnaplanar 1.6 speakers, CJ MV50 amp, Audio Aero Mk 1 CDP, Nordost Quattro Fil interconnects, Acoustic Zen Satori speaker cable.
I was pretty happy with my Rogue Magnum 99 right out of the box and it has only improved with use (~100 hrs now). I didn't perceive any significant sound change after ~25 hours of use. There was some tube break-in apparent over this time. My unit came with Electro Harmonix 6SN7s that many people claim to be one of the better currently manufactured tubes. I have not tried NOS 6SN7s yet in the main preamp but have rolled to Mullard 12AX7 and Amperex 12AU7 tubes for the phono stage and they made a significant difference. If you do some 6SN7 tube rolling, I would be very interested in the results.
Nolan
P.S. The rest of my system is Magnaplanar 1.6 speakers, CJ MV50 amp, Audio Aero Mk 1 CDP, Nordost Quattro Fil interconnects, Acoustic Zen Satori speaker cable.