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(!!!) (BEST OVERALL MATCHED PAIR) 311B Western Electric NOS 1964 and 1974 (35ma and 35.5ma) (Best matching and sound)

(!!!) (BEST OVERALL MATCHED PAIR) 311B Western Electric NOS 1964 and 1974 (35ma and 35.5ma) (Best matching and sound)

$ 288.88

1 pair) 311B WE NOS in white boxes

1 tube) 1964 NOS D getter halo (35ma) Gm=3050

1 tube) 1975 NOS O getter halo (35.5ma) Gm=3150

 

Tested on Amplitrex

Vplate=180V

Vscreen=135V

Vgrid=-15V

Good Ma = 30ma

Good Gm = 2900

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