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(!!!!) (Best Pair) 311B Amperex made in Russia NOS 1977 (34.2ma and 34.5ma) (very good construction)

(!!!!) (Best Pair) 311B Amperex made in Russia NOS 1977 (34.2ma and 34.5ma) (very good construction)

$ 99.99

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

1 tube) 34.2mA Gm=3000

1 tube) 34.5mA Gm=3050

 

Tested on Amplitrex

Vplate=180V

Vscreen=135V

Vgrid=-15V

Good Ma = 30ma

Good Gm = 2800-2900

 

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