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(!!!) (Recommended Single) 12AT7 Fisher Telefunken Germany <> bottom NOS 1964 (9ma/6.5ma) (recommended for mic)
(!!!) (Recommended Single) 12AT7 GE NOS 1981 (7.0/6.8ma)
(!!!) (Recommended Single) 12AT7 Telefunken Germany <> bottom NOS 1957 (9.8ma/7.2ma)
(!!!) (Recommended Single) 12AT7 Tungsol rebranded AKRAD "U" getter NOS 1956 (6.2/6.6ma)
(!!!) (Recommended Single) 12AT7=ECC81 Siemens Halske Germany NOS 1960 (10.3ma/11ma)
(!!!) (Recommended Single) 12AT7WC Raytheon NOS black plates triple mica "O" getter 1975 (10/12ma)
(!!!) (Recommended Single) 12AU7A GE NOS 1963 (8.6/9.5ma)
(!!!) (Recommended Single) 12AX7A Sylvania NOS 1970's (Gm=2600/3000)
(!!!) (Recommended Single) 12AY7 GE NOS 1970 (2.0/2.3ma)
(!!!) (Recommended Single) 12BZ7 RCA gray plates branded Tungsol NOS 1960's (2.0/2.1ma) 1-2% section balance
(!!!) (Recommended Single) 5691 RCA Red Base branded Westinghouse black plates used/good 1960 (1.8/2.1ma)
(!!!) (Recommended Single) 5881 Tungsol NOS 1954 (77ma)
(!!!) (Recommended Single) 6BQ7A RCA black plates NOS 1962 (10/14ma)
(!!!) (Recommended Single) 6BX7GT GE "O" getter gray plates 1963 (71/76ma)
(!!!) (Recommended Single) 6BX7GT GE branded Westinghouse "O" getter gray plates 1960's (43/48ma)
(!!!) (Recommended Single) 6BX7GT GE branded Westinghouse black plates NOS "O" getter 1962 (71/79ma)
(!!!) (Recommended Single) 6EU7 RCA NOS 1967 (50/32 and 46/32)
(!!!) (Recommended Single) 6EU7 RCA NOS 1967 (53/32 and 60/32)
(!!!) (Recommended Single) 6EU7 RCA NOS 1971 (53/32 and 45/32)
(!!!) (Recommended Single) 6SN7GTB Westinghouse gray plates NOS 1965 (8.6/7.4ma)
