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(!!!!) (Best Value Single) ECC83=12AX7 Telefunken Germany <> bottom ribbed plates branded GAP/R Computor tube used/good 1956 (Gm=1400/1500 and 0.8/0.9ma) 1-5% section balance
(!!!!) (Good Value 1962) M8137=12AX7S Philips SQ France ribbed plates NOS 1962 (0.8/0.9ma and Gm=1350/1350) (Special Quality 12AX7)
(!!!!) (Good Value Single 1960) 12AX7 GE tall gray ribbed plates "U" getter used/good 1960 (Gm=1600/1450 and 1.1/0.9ma)
(!!!!) (Read Review) 12AX7A=ECC83 Matsushita Japan NOS rebranded Raytheon NOS 1970 era (Gm=1800/1800 and 1.5/1.3ma) (similar to Mullard)
(!!!!) (Single) E83CC=12AX7 Siemens Halske Germany NOS 1976 (0.7/0.9ma and Gm=1400/1600)
(!!!!) (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) 12AX7A Sylvania NOS 1970's (Gm=2700/3200 and 1.7/2.3ma)
(!!!) (Best Single #3) 12AX7A Sylvania NOS 1970's (Gm=2400/2600 and 1.6/1.9ma)
(!!!) (Best Single 1953) 12AX7 GE gray ribbed plates "D" getter 1953 like new (Gm=1600/1600 and 1.1/1.0ma) (1st version)
(!!!) (Best Single 1962) JHS-12AX7 Sylvania NOS 1962 (Gm=2600/2500 and 1.8/1.9ma)
(!!!) (BEST SINGLE 1964) AFLC-12AX7WA Sylvania NOS 1964 (Gm=1900/1900)
(!!!) (Best Single) ECC83=12AX7 Siemens Halske Germany NOS 1966 (162 Series) (Gm=1500/1600 and 1.0/1.1ma)
(!!!) (Best Value Single) 12AX7=ECC83 FISHER HOLLAND large "O" getter halo 1960 used/good (Gm=1550/1600 and .9/1.0ma)
(!!!) (Best Value Single) 12AX7=ECC83 FISHER HOLLAND large "O" getter halo 1961 used/good (Gm=1500/1600 and .9/.9ma)
(!!!) (Best Value Single) 12AX7=ECC83 SIEMENS HALSKE GERMANY used/good 1966 (0.8/0.9ma)
(!!!) (Best Value Single) 12AX7=ECC83 SIEMENS HALSKE GERMANY used/good 1967 (0.8/0.9ma)
(!!!) (Best Value Single) ECC83=12AX7 Siemens Halske Germany used/good 1960's faded date code (1.3/0.9ma and Gm=1700/1500)
(!!!) (BEST VALUE) 12AX7=ECC83 Telefunken Germany <> bottom smooth plates used/tests like new faded printing (Gm=1600/1700) (1.0/1.2ma) 1-3% section balance
(!!!) (Best Value) 7025 RCA gray pinched plates used/good 1961 era (Gm=1300/1400 and 0.6/0.8mA) (recommended for guitar amp)
(!!!) (Best Value) 7025 Silvertone Hitachi Japan ribbed gray plates low hours/tests like new 1960's (Gm=1700/1800 and 1.2/1.4mA) (V1 guitar amp)
