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(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 (.8/1.2mA Gm=1400/1600)
(!!!!) (Good Value Single) 12AX7 Raytheon Black Plates "D" getter used/good 1956 (Gm=1500/1300) (0.9/0.9ma)
(!!!!) (microphonic single) 5687 Tungsol ribbed black plates "U" getter NOS 1952 (42/41.5ma) (1st series made)
(!!!!) (Read Review) 12AX7A=ECC83 Matsushita Japan NOS rebranded Raytheon NOS 1970 era (Gm=1800/1800 and 1.5/1.3ma) (similar to Mullard)
(!!!!) (Recommended Single) 12AX7 Brimar BVA England narrow ribbed plates used/good 1959 (1.1/1.0ma and Gm=1450/1350)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 (10.0/10.8ma) (high Gm)
(!!!) (7025 Black Plates) 7025=12AX7 RCA long ribbed black plates "D" getter used/good 1958 good printing (Gm=1500/1400) (rare)
(!!!) (Best Single - black plates) 12AX7 RCA Bell and Howell long ribbed black plates "D" getter used/tests like new 1950's faded printing (Gm=1700/1700) 1% section balance
(!!!) (Best Single 1950's #2) 12AX7 RCA "tall gray plates" with "D" getter like new mid-1950's (Gm=1.1/0.9ma and Gm=1700/1600) (Gm like new)
(!!!) (Best Value) 12AX7A RCA Hewlett Packard Sanborn Division NOS 1967 (0.8/0.8ma and Gm=1300/1400)
(!!!) (Best Value) 7025 RCA gray pinched plates used/good 1961 (Gm=1400/1800 and 0.8/1.5mA) (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)
(!!!) (Good Value Single) 12AX7A RCA Magnavox ribbed plates used/good 1961 (Gm=1500/1900 and 0.8/1.3ma)
(!!!) (Good Value Single) 12AX7A RCA ribbed plates used/good 1960's faded printing (Gm=1400/1700 and 0.8/1.1ma)
(!!!) (Recommended Single) ECC83=12AX7 Mullard Webcor ribbed plates used/good 1962 (161 series) in white box (1.0/0.7ma and Gm=1600/1400)
(!!!) (Single 1950's) 12AX7 RCA "tall gray plates" with "D" getter used/good mid-1950's (Gm=0.8/1.0ma and Gm=1600/1700) (Gm like new)
(!!!) (Single 1966) 12AX7=ECC83 Philips Miniwatt Holland "O" getter NOS 1966 (1.8/1.3ma and Gm=1900/1600)
(!!!) (Single) 12AU7=ECC82 Mullard BVA UK ribbed plates used/good 1970 Mitcham plant (8.4/8.2ma) (sweet sound)
(!!!) (Single) 12AU7=ECC82 Telefunken Germany <> bottom ribbed plates like new 1959 (9.6ma/11.8ma)
(!!!) (Single) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS 1968 (14.5ma/8.6ma)
