(!!!!!) (Best Overall Pair) 403B Western Electric NOS "D" getter 1969 (9.6/10.2ma) (same Gm)
(!!!!) (Recommended Pair) 403B Western Electric NOS "D" getter 1969 (5.6/5.6ma) 1% matched
(!!!!) (Recommended Pair) 403B=6AK5 Western Electric NOS "D" getter 1969 (7.3/7.0ma)
(!!) (Best 403B Single) 403B=5591=6AK5 Western Electric NOS "O" getter halo 1958 (8.2ma) (special quality)
(!!) (Best Single) JW-6AK5 Western Electric NOS "D" getter 1953 (6.2ma)
(!!) 403A=6AK5 Western Electric "D" getter like new 1966 (7.5ma)
(!!) 403A=6AK5 Western Electric NOS "D" getter 1971 (6.8ma)
(!!) 403A=6AK5 Western Electric NOS 1974 (6.6ma)
(!!) 403A=6AK5 Western Electric used/good 1970 (8.2ma)
(!!) 403B=6AK5 Western Electric NOS "O" getter 1980 in 1979 box (5.8ma)
(!) JHS-6AK5 Sylvania NOS 1954 (5.5ma)
