How do you break in a preamp

Agreed on leaving it on and using it. That's what I did for my XP-22 and I leave it on 24/7, I didn't notice a substantial difference as it broke in.

@stanwine congrats!!!

if you stream music just have your streamer playing 24/7. You don’t need to have the amp on. Also, keeping the preamp on even if not playing will help too. Just turn off the display when not listening (that’s what I do with my xp-12). 
You’ll need about 200hrs of break in. 

@audphile1 -

      I'll bet stanwine's pre is broken in by now.

               Just a guess!

                      😉

@rodman99999 HAHAHAHA!!!

Think about how you broke in a TV set, stereo or AV reciever or any other audio / video component you have ever owned.

The preamp is just electronic parts in a case. No need to over think it.

In fact it might be fun to listen closely right out of the box and take notes about how it sounds good and bad. log the hours and tracks you played. keep notes for several weeks and report back how different it may sound after 100, 200 or 300 hours.

Then YOU will become the expert.