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(!!!) 12AX7 Sylvania 1960-1965 used/tests like new small mica flake inside tube (Gm=2400/2800)
(!!!) (Best Value) 12AX7A RCA Hewlett Packard Sanborn Division NOS 1967 (0.8/0.8ma and Gm=1300/1400)
(!!!) (Good Value Single) 12AX7A RCA ribbed plates used/good 1960's faded printing (Gm=1400/1700 and 0.8/1.1ma)
(!!) (Good Value Single) 12AX7A GE NOS 1976 (0.9/1.3mA and Gm=1400/1800)
(!!!) (Best Single #2 1965) 6681=12AX7A RCA NOS 1965 (1.3ma/1.1ma and Gm=1800/1700)
(!!!) (Recommended Single) 12AX7A RCA gray ribbed plates NOS 1971 (Gm=1600/1800 and 1.2/1.4ma)
(!!!) (Recommended Single) 12AX7A Sylvania NOS 1970's (Gm=2600/3000)
(!!!!) (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 Value #2) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1973 (1.0/0.9mA and Gm=1400/1550)
(!!!) 12AX7=ECC83 Mullard UK "long plates" with "D" getter used/50-60% (0.6/0.7ma Gm=900/1000 - low Gm) (mC1 series)
(!!!) (Good Value) 12AX7A/7025 GE NOS pinched plates 1976 (0.9/1.7ma and Gm=1500/2000)
(!!!!) (Single) 12AX7 RCA Motorola black plates "D" getter used/good 1956 (0.9/1.0ma)
(!!!!) (Best Value Pair #1) 12AX7A RCA gray ribbed plates NOS 1967-1973 (best tone) (0.9/0.9ma and 0.9/1.1ma) (Fender)
(!!!) (Good Value Single) 12AX7A RCA Magnavox ribbed plates used/good 1961 (Gm=1500/1900 and 0.8/1.3ma)
(!!!!) (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) 12AX7A Sylvania NOS 1970's (Gm=2800/2900)
(!!) (Best Value Single) 12AX7 EI Yugoslavia Smooth Plates TELEFUNKEN copy branded Philips NOS 1968 (1.5/1.5ma and Gm=1700/1700) 1% section balance
(!!!) (Best Value) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1965 (1.0/0.8mA and Gm=1600/1400)
(!!!!) (Best Pair #1) 12AX7 GE branded 12AX7A International NOS 1977 (1.3/1.3mA and 1.4/1.4ma) (Same Gm) 1-2% matched
(!!!!) (Best Single 1960) 12AX7 GE tall gray ribbed plates "U" getter NOS 1960 (Gm=1700/1600 and 1.5/1.1ma)
