Yes, I have looked through the tubes threads at Asylum and found them helpful. Victor is very sincere in his conviction that the cc'a's and, short of that, the gray plate Siemens are best in the TP 2.0. And he is very knowledgable and dedicted to the search for "absolute sound" and an expert in the TP 2.0. Yet, from what I hear that the Amperexs can give, they sound intriguing as well. Beside musical perferences (I want to tune my system to awesome classical, though I listen to other genres as well), equipment, and room synergy, you have the personal taste mentioned. Given all this there is plenty of room to experiment. To paraphrase "so many tubes, so little time".