Very well could be playing a part BUT I recall liking the F1 a bit more before the Semisouth R100s were installed. I'll give it some time for everything to break in as new PSU CAps were installed.
That said, Zu has officially updated the Superfly page to emphasize the recommendation of tube over solid state for the Soul.
That said, Zu has officially updated the Superfly page to emphasize the recommendation of tube over solid state for the Soul.