I haven’t heard the first version of the Lyr so I can’t answer your question directly but this introductory post by Jason Stoddard to the Lyr 3 may help you, if only because he points out that
“We basically took the Lyr and Lyr 2 design and nuked them from orbit. Not a single shred of the original Lyr remains. Dynamically adaptive output stage? Nope. Two noval triodes? Nope. A single-purpose headphone amp? Nope. A U-shaped chassis? Nope. Gone, gone, gone, and gone.”