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(!!!) (2nd Best Pair) 311B Amperex made in Russia NOS 1977 (31.8ma and 33.2ma) (very good construction)

(!!!) (2nd Best Pair) 311B Amperex made in Russia NOS 1977 (31.8ma and 33.2ma) (very good construction)

By Tube World

$ 99.99

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

1 tube) 31.8ma Gm=2850

1 tube) 33.2ma Gm=2900

 

Tested on Amplitrex

Vplate=180V

Vscreen=135V

Vgrid=-15V

Good Ma = 30ma

Good Gm = 2800-2900

 

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