I need new power tubes. Very disappointed by the longevity of my last set; newer sylvania 6l6GC and I paid for them too. I am not sure of a real decent 6l6GC, I have been mislead with voodoo before. I felt like my last set of JJ were ok, but that 4 years ago when I bought them they lasted a long time, but the low end didn't feel quite as tight. SO... KT66 look badass. Heater current is 1.27 leaving me feel safe, since I found this great site...http://www.el34world.com/Transformers/fentrans.htm 022756 is stamped in my pan. Vg2 max is only 400, but I am pretty sure the schematic reads 375 volts. Should I go for it? Seems safe enough. I recall some one making an almost 6550 with reduced heater current. I cant find it now though. Has anyone real-life tried this, who runs their amp wide open all the time?