(!!!) (Best Pair) 7189 Sylvania black plates NOS 1970 era (42ma and 46ma)
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)
