(!!!!) (Best Quad) 6L6GT=6n3C Russian NOS 1982 in white boxes (70/70.5/71.6/72.0)1 matched quad) 6L6GT=6n3C Russian NOS 1982 in white boxes 1 tube) 70ma Gm=5650 1 tube) 70. 5ma Gm=5850 1 tube) 71. 6ma Gm=5850 1 tube) 72. 0ma Gm=5800 Good NOS Ma range 60 72ma Good NOS Gm = 6000 Recommended for Ampeg VT22 Fender Bassman 1969 SunValley VP 3488SE Fender Vibrolux reverb 1971 Fender Super Reverb 1970 Fender Twin 1958 Leben