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(!!!) (Single 1966) 12AX7=ECC83 Philips Miniwatt Holland "O" getter NOS 1966 (1.8/1.3ma and Gm=1900/1600)
(!!!) (Single) 12AX7=ECC83 Philips Holland NOS 1971 (1.2/1.3ma and Gm=1800/1800) 1-2% section balance
(!!!) (Single) 7025 Amperex Globe Logo Holland used/good 1967 (Gm=1300/1400 and mA=0.9/1.1ma)
(!!!) (Single) JHS-12AX7 Sylvania black plates "D" getter used/good 1955 (1.1/1.1ma) 1% section balance
(!!!) 12AX7 Sylvania 1960-1965 used/tests like new small mica flake inside tube (Gm=2400/2800)
(!!!) 12AX7=ECC83 Mullard UK "long plates" with "D" getter used/50-60% (0.6/0.7ma Gm=900/1000 - low Gm) (mC1 series)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1450 and 0.7/0.8mA)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1600 and 0.6./1.1mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1960's faded printing (Gm=1400/1600 and 0.9/1.1mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1972 (Gm=1450/1400 and 0.9/0.8mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/tests like new 1960's faded printing (Gm=1500/1500 and 1.1/0.9mA) (V1 guitar amp)
(!!) (Best Value Holland 1959) 12AX7 ADZAM Holland NOS 1959 large "O" getter halo (.8/1.1ma and Gm=1400/1600)
(!!) (Best Value Pair) ECC83=12AX7 EI Yugo Telefunken NOS smooth plates clone rebranded Amperex and National (1.2/1.2ma and 1.2/1.3ma)
(!!) (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 Single) ECC83=12AX7 Tungsram Hungary 1980 era branded Amperex NOS 1985 (1.3/1.6ma and Gm=1800/1800)
(!!) (Good Value Single) 12AX7A GE NOS 1976 (0.9/1.3mA and Gm=1400/1800)
(!!) (Good Value) 12AX7 Siemens Halske Germany rebranded "BOGEN" used/good 1960 (161 Series) (Gm=1400/1500 and 0.8/0.9ma)
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=2100/2300 and 1.7/1.9ma)
(!!) 12AX7 GE branded Video black plates D getter 1957 used mis-matched triode sections (1.1ma/0.6ma)
(!!) 12AX7A Westinghouse pinched plates "D" getter used/good 1960 era no printing (Gm=1450/1650)
