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(!!) (Best Value Single) 12AX7=ECC83 Mullard Bogen UK used/good 1966 (Gm=1300/1300) 1% section balance
(!!) (Good Value Single) 12AX7A GE NOS 1976 (0.9/1.3mA and Gm=1400/1800)
(!!!) (Best Single 1965) JHS-12AX7WA Sylvania NOS 1965 (1.3/1.5ma and Gm=1700/1800)
(!!) (Good Value Single) 12AX7=ECC83 Telefunken Germany <> bottom ribbed plates used/very good 1960 era (Gm=1300/1400 and 1.1/1.1ma)
(!!) 12AX7 Sylvania branded Philco NOS 1965 (Gm=2400/2400 and 1.6/1.5ma) 1-3% section balance
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=2100/2300 and 1.7/1.9ma)
(!!!!!) (Recommended Single) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966 (Gm=1500/1400 and 1.0/0.8mA)
(!!!) (Best Single #3) 12AX7A Sylvania NOS 1970's (Gm=2400/2600 and 1.6/1.9ma)
(!!!!!) (Recommended Single) ECC83=12AX7 Telefunken Germany <> bottom smooth plates NOS 1969 (1.1/1.0ma and Gm=1700/1600) 1-3% section balance
7729=12AX7 Raytheon Uniline Gold Pins (sold out)
(!!!) (Best Value Single) ECC83=12AX7 Siemens Halske Germany used/good 1960's faded date code (1.3/0.9ma and Gm=1700/1500)
ECC83=12AX7 East Germany used/good 1970's in white box (1.0/0.7ma)
(!!!!) (Slightly microphonic) ECC83=12AX7 Amperex Bugle Boy Holland "long plates" and "D" getter tests like new 1958 (1.2/1.3ma and Gm=1700/1700) 1-3% section balance
(!!!!) (Best Single #2) ECC803S=12AX7 Telefunken Qualitex Ulm Germany <> bottom like new 1964 (1.3/1.5ma and Gm=1600/1800)
(!!!!) (Best Pair) CV4004=12AX7 Mullard box plates NOS 1981 (0.9/1.2ma and 0.9/1.1ma)
(!!!) (Best Value #1) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1973 (1.0/0.9mA and Gm=1400/1550)
(!!!!) (Slightly microphonic Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1400/1500) (0.8/1.1ma)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1600 and 0.6./1.1mA) (V1 guitar amp)
(!!!!) (Best Overall Single) CV4004=12AX7 Mullard box plates NOS 1971-1972 (Gm=1600/1700) (1.3/1.5ma)
(!!) (Best Value Single) 12AX7 EI Yugoslavia Marshall Smooth Plates TELEFUNKEN copy NOS 1970's (0.7/0.6ma and Gm=1400/1300)
