When I ordered my VTPH-2 from Keith early last year, he in fact sent me 4 x 12ax7's and 3 x 13at7's. So it's up to me to try out which works best in my system.
He did ask me the input impedance of my amp. He will recommend based on the value.
He did ask me the input impedance of my amp. He will recommend based on the value.