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(!!!!) (Recommended Single) 12AX7 RCA Motorola black plates "D" getter tests like new 1954 (1.2/1.4ma and Gm=1700/1800)
(!!!!) (Recommended Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1500/1600) (0.9/1.1ma)
(!!!!) (Recommended Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1500/1600) (0.9/1.2ma)
(!!!!) (Single 1955 era) CV492=12AX7 BRIMAR England NOS black ribbed plates "D" getter 1955 era (1.1/1.0ma) (Gm=1800/1700) (rare)
(!!!!) (Single 1955) 12AX7 BRIMAR England shiney black ribbed plates "D" getter 1955 (1.3/1.0ma) (Gm=1800/1700) (rare)
(!!!!) (Single) 12AX7 RCA Motorola black plates "D" getter used/good 1953 (0.8/0.8ma and Gm=1400/1400) 1% section balance
(!!!!) (Single) 12AX7 RCA Motorola black plates "D" getter used/good 1956 (0.9/1.0ma)
(!!!!) (Single) E83CC=12AX7 Siemens Halske Germany NOS 1976 (0.7/0.9ma and Gm=1400/1600)
(!!!!) (Single) ECC83=12AX7 Philips Holland low hours/like new 1971 (1.1/1.1ma and Gm=1700/1600)
(!!!!) (Slightly microphonic Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1400/1500) (0.8/1.1ma)
(!!!) (7025 Black Plates) 7025=12AX7 RCA long ribbed black plates "D" getter used/good 1958 good printing (Gm=1500/1400) (rare)
(!!!) (Best Single #2 1965) 6681=12AX7A RCA NOS 1965 (1.3ma/1.1ma and Gm=1800/1700)
(!!!) (Best Single - black plates) 12AX7 RCA Bell and Howell long ribbed black plates "D" getter used/tests like new 1950's faded printing (Gm=1700/1700) 1% section balance
(!!!) (Best Single 1950's #2) 12AX7 RCA "tall gray plates" with "D" getter like new mid-1950's (Gm=1.1/0.9ma and Gm=1700/1600) (Gm like new)
(!!!) (Best Single 1953) 12AX7 GE gray ribbed plates "D" getter 1953 like new (Gm=1600/1600 and 1.1/1.0ma) (1st version)
(!!!) (Best Single 1962) JHS-12AX7 Sylvania NOS 1962 (Gm=2600/2500 and 1.8/1.9ma)
(!!!) (BEST SINGLE 1964) AFLC-12AX7WA Sylvania NOS 1964 (Gm=1900/1900)
(!!!) (Best Single 1965) JHS-12AX7WA Sylvania NOS 1965 (1.3/1.5ma and Gm=1700/1800)
(!!!) (Best Single) 12AX7A Sylvania NOS 1970's (Gm=2800/2900)
(!!!) (Best Single) ECC83=12AX7 Siemens Halske Germany NOS 1966 (162 Series) (Gm=1500/1600 and 1.0/1.1ma)
