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(!!!) (Single) 5814A=12AU7 GE NOS 1960's rebranded 5814WA Penta Labs 1993 (9.8/11.2ma)
(!!!) (Best Single) 12AU7A RCA clear top NOS 1973 (10.8/11ma) (same Gm) 1-2% section balance
(!!!) (Best Value Single) CV4003=M8136=12AU7 Mullard UK NOS large "O" getter halo 1962 dirt was over entire tube (10.6/11.0ma)
(!!) (Best Single) 12AU7A Tungsol tall ribbed plates NOS "O" getter halo 1960 era (9.8/9.6ma)
(!!!) (Single) 5814A GE "5 STAR" with "O" getter halo 1960's (10.8/11.6ma)
(!!) (Best Single) JG-5814A=12AU7WA GE triple mica NOS 1958-1959 (9.6/9.4ma)
(!!!!!) (Holland Single) 12AU7 Pope Holland NOS 1971 dimpled disc halo (12/13.4ma)
(!!!!) (Single) ECC82=12AU7 Philips Miniwatt Holland NOS "O" getter 1965 (11.5/12.0ma) (High mA and Gm)
12AU7=ECC82 Brimar branded Tronix tall narrow plates used/good 1960 (6.4/7.2ma)
(!) 12AU7=ECC82 Miniwatt France used/good 1970 (10/9.6ma)
(!!) 12AU7A Sylvania NOS 1960 era (11.6/9.4ma)
(!!) (Best Value Pair) 12AU7A Sylvania NOS 1970-1975 (9.0/9.1ma and 9.0/8.8ma) (Close Gm)
(!!!) (Recommended Single 1957) 12AU7A Sylvania gray pinched plates "D" getter halo NOS 1957 (9.2/10.2ma)
(!!!) 12AU7 RCA tall gray plates "D" getter used/good 1953 (9.2/9.8ma)
(!!) (SINGLE) 5963=12AU7 RCA NOS 1965 (10.8/13.2ma)
(!!!!) (Best Telefunken Single 1966) ECC82=12AU7 Telefunken Germany <> bottom smooth plates NOS 1966 (9.3/10ma) (High Gm)
(!!!) (Best Pair 1961) ECC82=12AU7 Miniwatt Holland NOS and like new 1961-1963 (9.8/9.2ma and 9.4/9.8ma)
(!!!!) (Best Single #1) 12AU7=ECC82 Mullard UK shield logo NOS 1963 (10.2/11.0ma) (smooth rich sound)
(!!!) (Best Value Single) 12AU7=ECC82 Telefunken smooth plates like new 1963 (10/8.4ma)
(!!!) (Single) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS 1968 (14.5ma/8.6ma)
