Yes, keep your system, SS for everyday and Tube for special occasion.
IMHO, frequently resort to entertaining upgrades that may not necessarily "improve" the system's performance, but do create detectable changes in the performance. However these artifact styled "improvements" become boring after a while, because they add the same accent to all music, making it sonically one-dimensional.
I did upgrade from one MC275 to two and now MC601 Mono Block, I kept both amp to enjoy the experience of their difference.