Psvane KT88 tubes in VAC amps

Dr. John, are the CV-181's the alternative to the 6SN7 input tubes that come in Kevin's amps? I swapped out the two input tubes on my Phi 200 mono amps with those tubes and the amp sounds fantastic. I did try the Psvane KT-88's but feel the KT-88-SC that are stock sound just as good to me so I kept the Psvane's as back ups. On the 200's the only thing I am changing out is the two 6SN7s for the CV-181s and saving the money and buying the SC version KT-88's from Kevin who does a good job of matching and assuring quality. Both models are built in the same factory as the Psvane; Shiguang (sp?) in China. I use the Psvane 12AX7's in my Signature phono stage and find them to be slightly quieter than the stock tubes.