S-Man
StrivingON
The NCC220 does not retain the same musicality as the NCC200, it improves on it as several contributors to this thread have noted.
The two designs are very similar but it's the fully complementary output stage of the NCC220 that puts it in a different, higher, league than the NCC200 with its quasi-complementary output stage.
There are two main changes from NCC200 to 220:
1) Quasi > fully complementary o/p stage
2) Change of R2 from 22K to 1K
The effect of #2 is not that subtle, it cleans up the sound and makes it sound less "dense" i.e. less of the Naim sound.
I would hazard a guess that this makes more difference to the sound than the changes to the o/p stages.
@Joppe - you could try linking/shorting R2 on your NCC200 boards and have a listen.