Honestly just sit back relax and listen to music with your tube amp in your system. The tubes will get better with time. For me with a tube amp it was a couple of hours. Tube preamp or tube dac a day or so.
Before I came to the realization above this was how I was breaking in my tube dac and tube preamps. I have a 5 disc CD changer and I would put varying music and 1 Isotek break-in disc in there. I set it to play all 5 discs so my tube stuff would get a signal going through it for 4 to 5 hours straight. After the music stopped I powered down everything and restarted the process after everything cooled down. I did this periodically over 2 weekends as I was home. All in all I got 60 hours on the tubes. I'm not sure if this made an improvement as I couldn't recall what the tubes sounded like in my system before this break-in process.
If you want to follow my madness to the dark side feel free. Honestly I say now just sit back and listen. If it doesn't sound good after a couple of listening sessions then you may have to get a different tube.
Before I came to the realization above this was how I was breaking in my tube dac and tube preamps. I have a 5 disc CD changer and I would put varying music and 1 Isotek break-in disc in there. I set it to play all 5 discs so my tube stuff would get a signal going through it for 4 to 5 hours straight. After the music stopped I powered down everything and restarted the process after everything cooled down. I did this periodically over 2 weekends as I was home. All in all I got 60 hours on the tubes. I'm not sure if this made an improvement as I couldn't recall what the tubes sounded like in my system before this break-in process.
If you want to follow my madness to the dark side feel free. Honestly I say now just sit back and listen. If it doesn't sound good after a couple of listening sessions then you may have to get a different tube.