(!!) EC92=6AB4 Telefunken Germany <> bottom NOS 1957 (7ma)
(!!!!) (Recommended Single) EC92 Valvo Germany by Siemens NOS 1972 (12.5ma)
6664=6AB4 RCA black plate NOS 1967 (9ma)
6AB4 RCA black plate "D" getter NOS 1955 (11.8ma)
6AB4 RCA black plate "D" getter NOS 1950's (11.4ma)
6AB4 Tungsol NOS "D" getter 1950's (13.2ma)
6AB4 Tungsram Hungary gray plate NOS (8.2ma)
6AB4 RCA branded CBS "D" getter halo black plate 1960 (12.9mA)
6AB4 GE branded CBS NOS 1960 era (13ma)
6AB4 GE NOS "D" getter 1962 (8ma)
6AB4 Tungsol NOS "D" getter 1950's (9.6ma)
(!!!) (2nd Best Single) EC92=6AB4 Telefunken Germany <> bottom NOS 1969 (9.0ma)
(!!!) (2nd Best Single) EC92=6AB4 Telefunken Germany <> bottom NOS 1969 (9.2ma)