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(!!!) (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm) Image 1
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(!!!) (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm) Nav Image 1

(!!!) (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm)

$50.99 $59.99


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1960's 311a 311B Amperex preamp tubes Russia western electric wp


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  • Description

1 pair) 311B Amperex made in Russia NOS 1977 large getters 

1 tube) 37.2mA Gm=3100 3/16" taller 

1 tube) 38.5mA Gm=3200

 

Tested on Amplitrex

Vplate=180V

Vscreen=135V

Vgrid=-15V

Good Ma = 30ma

Good Gm = 2900

 

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