Lamm LP2 vs 2.1

Anyone know what the sound difference is between the older and current model Lamm phono pre? Was the update just about easier to find tubes or did they change the sound?
The nice thing with Lamm is that they tell you exactly what changed on their website (scroll down to Design Elements). The LP2.1 sounds different, and in my opinion, better.


disclaimer: I'm a Lamm Industries dealer