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(!!!!!) (Best Overall Pair) ECC82=12AU7 Telefunken Diamond Bottom ribbed plates NOS 1958-1960 (9.0/10.2ma and 10/9.6ma) (Same Gm)
(!!!!!) (Best Pair 1974) 12AU7 Mullard Philips UK NOS 1974 (10.4/9.4ma and 10.0/9.8ma) (Rogue, Hovland, Audio Note) 1-3% matched
(!!!!!) (Best Value Mullard Pair) 12AU7=ECC82 Philips Mullard UK NOS 1966-1974 same build (10.6/10.3ma and 11.7/10.4ma) (close Gm matching) (Rogue, Hovland, Audio Note)
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma) (strong Gm)
(!!!!!) (Oldest Pair 1950's) ECC82=12AU7 Telefunken Diamond Bottom <> ribbed plates NOS 1955-1959 very good printing (9.2/9.0ma and 9.4/9.6ma)
(!!!!!) (Recommended Single) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=1700/1900) (1.0/1.4ma)
(!!!!) (Best Overall Pair 1964) 12AU7=ECC82 Mullard BVA UK ribbed plates shield logo NOS 1964-1965 (13.3/12ma and 12.6/11.5ma) (Rogue, Hovland, Audio Note) (Highest mA and Gm)
(!!!!) (Best Overall Pair) ECC83=12AX7 Tungsram Hungary branded IEC Mullard NOS 1982 (1.5/1.6ma and 1.4/1.7ma)
(!!!!) (Best Pair 1974) 12AU7=ECC82 Mullard UK branded Philips ribbed plates NOS 1974 (9.8/9.4ma and 9.5/10.5ma) (Rogue, Hovland, Audio Note) (Best Pair)
(!!!!) (Best Single #1) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1700/1800) (1.5/1.6ma) (Highest mA and Gm)
(!!!!) (Best Single) 12AX7 RCA black plates branded Westinghouse "U" getter NOS 1950's (1.1/1.4ma and Gm=1700/1800) (strong mA and Gm)
(!!!!) (Best Value Pair #1) 12AX7A RCA gray ribbed plates NOS 1967-1973 (best tone) (0.9/0.9ma and 0.9/1.1ma) (Fender)
(!!!!) (Best Value Single) 12AU7=ECC82 Philips by Mullard UK ribbed plates used/good 1969 (8.2/8.2ma) 1% section balance
(!!!!) (Best Value Single) ECC83=12AX7 Mullard Webcor ribbed plates used/very good 1962 (161 series) (1.0/0.9ma and Gm=1500/1500) 1-3% section balance
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 (.8/1.2mA Gm=1400/1600)
(!!!!) (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 very good printing (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)
