(!!!!) (Recommended Pair) 403B Western Electric NOS "D" getter 1969 (5.7/5.6ma) 1-2% matched

1 matched pair) 403B Western Electric NOS "D" getter 1969 original boxes 1 tube) 5.1ma Gm=4200 1 tube) 5.1ma Gm=4200   Matched on Amplitrex Vplate=180V Vscreen=120V Vgrid=-2V Good Iplate = 5.5 - 7ma Good Gm = 4000-5100   Recommended for - Little Dot Mk3 - Little Dot Mk4 SE - Grant Fidelity tube buffer - CAD Trion tube microphone - Miniwatt EL84 amp - Grant Fidelity B283 - Darkvoice 332 - Yaqin CD 2