sorry for the delay in replying. Yes the CV-181's replace Kevin's stock maroon-based 6SN7's and blow them away-not cheap for tubes of their type, but worth every penny. Psvane now produces a TII version of the 88's with a gray coating and I've read with some credence that an all-Psvane complement creates an effect greater than the sum of its parts. Kevin's stock SC's are no slouch, but then we always want more, don't we ?
-john
-john