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(!!) (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 Single) ECC82=12AU7 Telefunken Germany <> bottom smooth plates NOS 1966 good printing (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)
(!!!) (Single) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS 1968 (14.5ma/8.6ma)
(!!) (Best RCA Single) JRC-6189=12AU7WA RCA black plates "D" getter NOS 1957 (8.6/9.0ma)
5814A RCA NOS 1970 era slightly microphonic (10.2/11.2ma)
5963 RCA Hewlett Packard gray plates used/good 1960 (8.0/9.2ma)
(!) 6189=12AU7WA GE black plates "U" getter NOS 1950's rebranded Dumont 1978 (9.8/10.1ma) 1-2% section balance
6189W GE JAN NOS 1973 mica flake inside tube (9.0/9.2ma) 1-2% section balance
6189W GE JAN NOS 1981 (8.4/9.0ma)
(!!!!) (Single) ECC82=12AU7 Philips Holland NOS 1969 (11.8/11.4ma) (Same Gm) 1-3% section balance
