(!) (#2 6EW7 Single Tube) 6EW7 GE Japan BIG BOTTLE NOS 1960's (5.0/37ma)1 tube) 6EW7 GE Japan BIG BOTTLE NOS 1960's (PAIRS SOLD OUT) 1 triode section) 5. 0ma Gm=2000 1 triode section) 37ma Gm=7000 Tested on Amplitrex AT1000 Section 1 reference = 4 6ma and Gm=1700 2100 Section 2 reference = 35 50ma and Gm=6000 8000 (6EW7 is a close substitute to the 6DE7) Woo Audio 6 Woo Audio 6 SE RCA made skinny bottle 6EW7 Sylvania made FAT BOTTLE 6EW7