(!!!) (#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 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)
