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(!!!!!) (Best Overall Pair) GL-6072 GE 5 star triple mica black plates "D" getter halo 1953-1954 NOS (2.7/3.0ma and 2.8/2.7ma) (AKG, Tele 251, Peluso, Rode)
(!!!!!) (Best Value Single) 6072 GE 5 star triple mica black plates "O" getter halo 1960's - 2 hairline cracks top of glass - tests like new (2.4/2.7ma) (mic grade)
(!!!!) (Best Overall Single) 6072 GE "5-Star" NOS black plates triple mica "O" getter halo 1960 (3.5/3.4ma) (mic grade) (Highest mA and Gm)
(!!!!) (Best Single 1958) 5751 Sylvania black plates triple mica D getter halo 1958 like new (2.5/2.3ma)
(!!!!) (Best Value Single) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/good (2.0/2.1ma)
(!!!!) (PAIR) 5751 Hitachi Japan glossy black ribbed plates triple mica double D getters 1960's (2.0/2.2ma and 1.8/2.2ma) (rare)
(!!!!) (Recommended Single) JG-5751WA GE black plates triple mica D getter 1958 like new (2.6/2.6ma) 1% section balance
(!!!!) (Recommended Single) JG-5751WA GE black plates triple mica D getter 1958 like new (2.9/2.8ma)
(!!!!) (Recommended Single) JG-6072 GE black plates triple mica "U" getter halo like new 1950's (2.5/3.1ma) (recommended for guitar amp or mic preamp)
(!!!!) (Single) 5751 GE NOS gray plates NOS 1981 (2.6/2.9ma) (Same Gm)
(!!!!) (Single) 5751 Siemens Halske Germany triple mica NOS 1966-1967 (1.8/2.4ma)
(!!!!) (Single) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 low hours/like new (2.2/2.0ma)
(!!!) (Best Single) 5751 GE 5 Star NOS 1974 (2.9/2.8ma) 1-2% section balance
(!!!) (Best Single) 5751 GE 5 Star NOS 1975 (2.4/2.4ma) 1% section balance
(!!!) (Best Single) E82CC=12AU7 Siemens NOS triple mica NOS 1967 (10.8ma/11.2ma)
(!!!) (Best Value Single) 12AX7 Baldwin Sylvania "D" getter used/tests like new 1959 (2.1/2.0ma) (Highest mA and Gm) 1-2% section balance
(!!!) (Best Value Single) GL-5751 GE "5 Star" black plates triple mica D getter 1955 era used/tests like new (2.3/2.4ma) (Gm like new) 1-2% section balance
(!!!) (Good Value Single) GL-5751 GE "5 Star" black plates triple mica D getter 1954 used/good (2.1/2.3ma)
(!!!) (Recommended Pair) 12AX7 Baldwin Sylvania "D" getter used/very good 1959 (1.7/1.8ma and 1.9/1.6ma)
(!!!) (SINGLE) 12AU7 RCA tall black plates "D" getter used/good 1950's (9.8/8.2ma)
