(!!!) (#1 7189 RCA Pair) 7189 RCA NOS 1969-1970 (48.5ma and 56.5ma) (close Gm)
(!!) (#2 7189 RCA used pair) 7189 RCA used/good 1960's - 1970 75% output (35.5ma and 34ma)
(!) 7189 Sylvania Holland "D" getter NOS 1959 (53ma)
7189 Amperex Heerlen Holland NOS 1970 (44ma)
7189 Amperex Japan NOS misbranded 7189A NOS 1970 (48.5ma)
7189 RCA used/good 1960's (36.5ma)
7189 Sylvania black plate NOS (80ma) (recommended for FIXED-BIAS amp only due to high current)
7189 Sylvania gray plate NOS (44ma)
