(!!!!!) (Best Single) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 tests like new (2.7/2.7ma) (1-2% section balance)
(!!!!!) (Best Value Single) 6072 GE branded RCA triple mica black plates "O" getter halo 1960 used/good (2.0/2.0ma) (preamp, V1 position in amp)
(!!!!!) (Recommended Single) JG-6072 GE triple mica black plates "O" getter NOS 1962 (3.1/3.2ma) (AKG, Tele 251, Peluso, Rode) (similar sound to 5-Star GE) (same Gm)
(!!!!!) (Single) GL-6072 GE 5 star triple mica black plates "O" getter halo 1962 like new (2.8/3.6ma) (mic grade)
(!!!!!) (Single) GL-6072 GE 5 star triple mica black plates "O" getter halo 1962 like new - faded printing (2.7/2.5ma) (mic grade)
(!!!!) (2nd Best Pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new faded printing (2.6/2.7ma and 2.7/2.8ma) 1-3% matched (Same Gm)
(!!!!) (Best Pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new faded printing (2.8/2.9ma and 2.8/2.9ma) 1% matched
(!!!!) (Best Value Pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new (2.1/2.0ma and 2.1/2.1ma) 1-2% matched (Same Gm)
(!!!!) (Best Value Single) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/good (2.0/2.1ma)
(!!!!) (Recommended Pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new (2.4/2.8ma and 2.5/2.6ma) 1-3% matched (same Gm)
(!!) (Best Value Single) EF14 Telefunken Germany used/good 1950 (12.5ma)
(!!) (Slightly Microphoinic Single) 6072A RCA black plates NOS 1971 (2.6/3.0ma)
(!!) EF80=6BX6 Mullard UK "D" getter NOS 1963 faded Mullard logo (10.6ma)
(!!) EF80=6BX6 RTC by EI Yugoslavia NOS 1976 (14ma)
* (read review) 6072 GE 5 star triple mica black plates "O" getter halo 1962
EF80 Lorenz made in Philips Italy NOS 1967 (7ma)
EF80 Siemens Germany 1964 rebranded IEC Mullard 1966 NOS (6.7ma)
EF80 Valvo made in Philips Italy NOS 1969 (8.5ma)
EF80=6BX6 Sylvania Made in England unknown maker NOS 1970's (19.5ma)
