No, I went from A/AB to tubes. Classe' 150 and Five to Audible Illusion M3A and Rogue M120. I enjoyed the Classe units for many years but wanted something that would give me a bit more organic sound. The change delivered in spades.
I do have 3 class D amps that I use in other systems. They are not SOTA class D but they work well for their usage. I just don't think I could go class D for my big system.
Also, your VTL units are really very nice and coupled with the right speakers should be fantastic. I would only dump them for tubes that might move me forward or for speakers that I must have and that are too demanding for tubes.
I do have 3 class D amps that I use in other systems. They are not SOTA class D but they work well for their usage. I just don't think I could go class D for my big system.
Also, your VTL units are really very nice and coupled with the right speakers should be fantastic. I would only dump them for tubes that might move me forward or for speakers that I must have and that are too demanding for tubes.