(!!!!) (Recommended Pair) 311B Western Electric NOS 1973 and 1975 (35.2ma and 36.4ma)
$188.88
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1 pair) 311B WE NOS "O" getter halos in white boxes 1 tube) 36.4ma and Gm=3250 (1973) 1 tube) 35.2ma and Gm=3150 (1975) Tested on Amplitrex Vplate=180V Vscreen=135V Vgrid=-15V Good Ma = 30ma Good Gm = 2900
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