Hi, I am starting a build of a pp amp that will use 4 EL 156 power tubes , in pp ul. My question is what would be a good driver tibe, and phase imverter? I already have 12bh7, 5964, 12Au7 and the Russian 6h30. I also have E80cc Phillips tubes onhand. I want to run the El156 at about 30w each, 60w per channel. Which of my onhamds best have the ruggedness to really drive the el156 . I have a quad of new testing Telefunken el-156 ready to go. I plan parallel 274b mesh Playes to provide power. Amy suggestions?