Yes, I’m afraid that the burn in period is a bit of a pain in the proverbial. My dealer told me not to make any evaluations on SQ for at least two weeks after mine came back from a service and DR’ing. He was dead right. It was up and down like a donkey’s gallop! From switch on it gave me a glimpse of what it was like. The following day it was as flat as a pancake and just plain dull. The next day it could cut glass. I had to give up listening as my ears were bleeding. This continued for several days become less obvious as time went on.
Then on about day 15 it just suddenly snapped into focus. Like someone had pulled a switch. I remember being amazed at the sudden jump in realism. The system was no longer playing it CD it was playing live music in my front room. I’d heard it mentioned that there was a further lift after six months or so and I experienced the same thing.
Just make sure you get the power supply away from the pre and the cables are well dressed. Then sit back and enjoy the wait.