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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 1961) 12AU7=ECC82 Mullard UK ribbed plates NOS 1961 same date codes (9.0/8.8ma and 9.3/9.2ma) (same Gm) 1-3% matched
(!!!!!) (BEST PAIR 1963) 12AU7=ECC82 Mullard UK ribbed plates NOS 1963 same date codes (9.5/8.6ma and 9.0/8.6ma) (close Gm) 1-3% matched
(!!!!!) (Best Pair 1965) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS 1965 (10.6/10.4ma and 9.8/10.9ma) (Close Gm matching)
(!!!!!) (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)
(!!!!!) (Holland Single) 12AU7 Pope Holland NOS 1971 dimpled disc halo (12/13.4ma)
(!!!!!) (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)
(!!!!!) (PAIR 1961-1962) 12AU7=ECC82 Mullard BVA UK ribbed plates NOS 1961-1962 (10/8.6ma and 10/8.8ma) (close Gm) 1-3% matched
(!!!!) (Best CV4003 Quad) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.4/9.0, 8.4/9.0, 8.4/8.8, 8.4/8.8mA)
(!!!!) (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) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/9.6ma and 9.4/9.8ma) 1% matched (can make a quad with another pair)
(!!!!) (Best Overall Quad) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (8.8/8.8, 8.8/8.8, 8.6/8.8, 8.6/9.0mA)
(!!!!) (BEST OVERALL SINGLE) 12AU7A GE NOS 1958 copper grid posts (11.8/11.4ma) 1-3% section balance
(!!!!) (Best Overall Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (11.2/11.7ma) 1-2% section balance (Highest mA and Gm)
(!!!!) (Best Overall Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (12.2/12.8ma) 1-3% section balance (highest mA and Gm)
(!!!!) (Best Pair #2) 12AU7 Philips Holland NOS 1971-1972 dimpled disc halo (10.2/10.6ma and 11.2/11.6ma)
(!!!!) (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 Pair) 5814A=12AU7 Sylvania Gold Brand triple mica nickel pins NOS "O" getter halo 1960 era - faded printing (10.0/10.8ma and 9.8/9.6ma) 1-5% matched
