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

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

$ 59.99

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

 

See more: vacuum tube
Scroll to top