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(!!!!) (Best Pair #1) ECC83=12AX7 Tungsram Hungary branded IEC Mullard NOS 1982 (1.3/1.6ma and 1.4/1.6ma) 1-3% matched (high Gm)
(!!!!) (Best Pair 1960) 12AX7 GE tall gray ribbed plates "U" getter like new 1960 (1.2/1.2ma and 1.3/1.2ma) 1-3% matched
(!!!!) (Best Pair for the money) 12AX7=ECC83 Telefunken Germany <> bottom ribbed plates used/good 1959 (0.9/1.2ma and 1.0/1.1ma) 1-3% matched
(!!!!) (Best Siemens Single) CV492=ECC83=12AX7 Siemens Halske NOS 1968 (1.2/1.5ma) (Gm=1800/1900) (phono, mic, preamp)
(!!!!) (Best Single #1) 12AX7 RCA Motorola black plates "D" getter like new 1956 (1.5/1.7ma and Gm=1700/1800)
(!!!!) (Best Single #1) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1700/1800) (1.5/1.6ma) (Highest mA and Gm)
(!!!!) (Best Single #2) ECC803S=12AX7 Telefunken Qualitex Ulm Germany <> bottom like new 1964 (1.3/1.5ma and Gm=1600/1800)
(!!!!) (Best Single 1956) 12AX7 GE Motorola tall gray ribbed plates "U" getter 1956 like new (Gm=1700/2000 and 1.6/2.1ma)
(!!!!) (Best Single 1957) ECC83=12AX7 Mullard UK long plates "D" getter NOS 1957 (mC1 series) (1.1/1.3ma) (rare)
(!!!!) (Best Single 1958) 12AX7 GE tall gray ribbed plates "U" getter 1958 like new (Gm=1800/1800 and 1.3/1.3ma) 1% section balance
(!!!!) (Best Single 1960) 12AX7 Amperex Bugle Boy Holland like new 1960 (Gm=1700/1800 and 1.1/1.3ma) 1-5% section balance
(!!!!) (Best Single 1960) 12AX7 GE tall gray ribbed plates "U" getter NOS 1960 (Gm=1700/1600 and 1.5/1.1ma)
(!!!!) (Best Single 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 (Gm=1700/1800 and 1.3/1.4ma)
(!!!!) (Best Single 1961) 12AX7 Amperex Bugle Boy Holland low hours/like new 1961 (Gm=1500/1500 and 0.9/1.0ma) 1-3% section balance
(!!!!) (Best Single 1961) 12AX7=ECC83 Philips Miniwatt Holland 1961 large "O" getter halo NOS (1.8/1.3ma and Gm=2100/1700)
(!!!!) (Best Single 1965) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1965 (1.6/1.2mA and Gm=2000/1700) (Fender, McIntosh) (Highest mA and Gm)
(!!!!) (Best Single 1966) 12AX7=ECC83 Philips Holland NOS 1966 (2.1/1.9ma and Gm=2100/2100) (Highest mA and Gm)
(!!!!) (Best Single) 12AX7 Philips Holland NOS 1971 (1.2/1.2ma and Gm=1700/1700) 1% section balance
(!!!!) (Best Single) 12AX7 RCA black plates branded Westinghouse "U" getter NOS 1950's (1.1/1.4ma and Gm=1700/1800) (strong mA and Gm)
(!!!!) (Best Single) 12AX7=ECC83 Philips Holland NOS 1969 (1.0/1.1ma and Gm=1600/1600) 1-2% section balance
