(!!!!) (Best Pair) 6N7 GE metal can NOS 1954-1955 (3.3/3.1ma and 3.1/3.1ma) 1-2% matched

1 matched pair) 6N7 GE metal can NOS 1954-1955

1 tube) 3.3/3.1ma Gm=1500/1500

1 tube) 3.1/3.1ma Gm=1600/1500

Good Ma = 2.5-3.0ma 

Good Gm = 1400-1600

(6N7=6A6=ECC31, 6N7=Type 53 with different filament voltage, also see 5694)
(the best sounding 6N7 type ever made is the ECC31 Mullard)

- Sun Audio SV-6V6SE 2008