I'm not too crazy on breaking in tubes, but the idea behind it makes sense. But I do think warmed up tubes sound better than cold tubes. I usually try to keep them on for at least 10 minutes before playing my first tune.

How does your Maggies sound when music become complex? My Chinese amp wasn't too happy with 1.6QR on large emsemble music. But It was very good with some string quartet.

Have Fun and welcome back!!!!
JRA