Description
(!!!!!) (Best Overall Pair) 311B Western Electric NOS 1972-1974 (36.2ma and 37.8ma)
1 pair) 311B Western Electric NOS 1972-1974 original boxes
1 tube) 36.2ma and Gm=3200 (1972)
1 tube) 37.8ma and Gm=3060 (1974)
Tested on Amplitrex
Vplate=180V
Vscreen=135V
Vgrid=-15V
Good Ma = 30ma
Good Gm = 2900