(!!!) (BEST SINGLE 1964) AFLC-12AX7WA Sylvania NOS 1964 (Gm=1900/1900)
(!!) (SINGLE) 7025 RCA gray NOS 1970 era (Gm=1450/1600 and 1.0/1.2mA)
(!!!) (Best Value Single) 12AX7WA SIEMENS HALSKE GERMANY triple mica low hours/like new 1969 (1.0/1.2ma)
(!!!) (Best Single 1962) JHS-12AX7 Sylvania NOS 1962 (Gm=2600/2500 and 1.8/1.9ma)
(!) (slightly microphonic single) CV4004=12AX7 Mullard NOS 1981 (1.3/2.1ma)
(!) 12AX7A GE used/good 1981 (Gm=1250/1250, 0.6/0.7ma)
(!!!) (Recommended Single) 12AX7=ECC83 Mullard UK old logo copper grid posts used/good 1963 (.9/1.0ma and Gm=1500/1500)
(!!) 7025 Westinghouse "D" getter 1960 era used (Gm=1200/1300)
(!!!!) (Recommended Mullard 1960) 12AX7 Mullard BVA British Made box plates NOS 1960 (1.0/1.0ma and Gm=1600/1500)
*** (!!) 12AX7A/7025 Sylvania branded RCA used/good 1970's (Gm=1600/2800)
(!!) 12AX7WA GE printed 12AX7 B&L used/good 1970's (Gm=12001300) (0.7/0.8ma)
(!!!!) (Best Value 1965) 12AX7 Philips Miniwatt Holland like new 1965 (Gm=2000/2000 and 1.6/1.7ma) (Highest mA and Gm)
(!!!) (Best Value Single) 12AX7=ECC83 Mullard UK ribbed plates used/good 1967 (1.7/0.8ma and Gm=2000/1600) (V1 guitar amp)
(!!) (Nice Single) 12AX7 GE NOS pinched plates 1970 (1.2/1.1ma and Gm=1800/1700)
12AX7 GE branded "W/U" tall ribbed plates "U" getter halo used/good 1961 (Gm=1300/1300)
(!) (Best Toshiba Single) 12AX7 Toshiba Lindal Japan NOS 1960's (Gm=1800/1800)
(!!!) (BEST VALUE PAIR) 12AX7=ECC83 EI Yugoslavia Smooth Plate Telefunken clones 1979 1-3% matched (1.2/1.3ma and 1.4/1.3ma) (High Gm)
(!!) (Best Value Single) 12AX7=ECC83 Mullard UK copper grid posts used/good 1965 (Gm=1400/1400)
(!!) (Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=1800/2500 and 1.5/2.1ma)
(!!!) (Best Single 1965) JHS-12AX7WA Sylvania NOS 1965 (1.3/1.5ma and Gm=1700/1800)