1 pair) 329A Western Electric "D" getter halo NOS 1972 large getters, original boxes

1 tube) 35ma Gm=3170 (7213=1972)

1 tube) 37ma Gm=3260 (7239=1972)

Matched on Amplitrex

Vplate=180V

Vscreen=135V

Vgrid=-15V

Good Ma range 29-30ma

Good Gm range 2800-2900 

General Information

(329A=311A with a 7.5V filament)

General Information

(329A=311A with a 7.5V filament)