(!!!!!) (Best Overall Pair) 311B Western Electric NOS 1972-1974 (32ma and 33.4ma)
$169.99
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1 pair) 311B Western Electric NOS 1972-1974 original boxes 1 tube) 32.0ma and Gm=3060 (1972) 1 tube) 33.4ma and Gm=3100 (1974) Tested on Amplitrex Vplate=180V Vscreen=135V Vgrid=-15V Good Ma = 30ma Good Gm = 2900
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