Very good quality 6L6GC"This tube is a work of art! And it sounds as good as it looks. The lows are deep, big and round. The mids are very harmonically rich and natural while the highs are thick, creamy and very detailed. This is the tube for Peavey, Fender, Mesa, Soldano, Bogner ect. I have run these tubes in place of 7027A’s in the old Ampeg gear at 600 plate volts with no problem. I also stock the JJ 7027A for you guys that just have to have them." "This Tesla / JJ 6L6 is a high quality option for both guitar and home audio amplifiers. It packs a lot of output and is a little less bright than the cheaper models in this type."