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(!!!) (SINGLE) 12AU7 RCA tall black plates "D" getter used/good 1950's (9.8/8.2ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.2/9.8ma)
(!!) (Best Value Pair) 12AU7A Sylvania NOS 1960's - 1970's (10.6/9.2ma and 9.6/10ma)
(!!!!) (BEST OVERALL SINGLE) 12AU7A GE NOS 1958 copper grid posts (11.8/11.4ma) 1-3% section balance
(!!!!) (BEST SINGLE 1985) 12AU7A GE NOS 1985 copper grid posts (9.2/9.4ma) 1-2% section balance
(!!!!) (SINGLE) 12AU7A GE NOS 1976 copper grid posts (9.4/8.8ma)
(!!!!) (SINGLE) 12AU7A GE NOS 1972 copper grid posts (10.6/9.8ma) (warm and smooth)
(!!!) (Single) 12AU7A RCA clear top NOS 1968 (8/11ma)
(!!!) (Recommended Single) 12AU7A RCA clear top NOS 1967 (14.4/10ma)
(!!!!) (Recommended Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/10.8mA)
(!!!) (Single) JAN-6189=12AU7WA Sylvania NOS 1978 (9.2/8.8ma) (same Gm)
(!!!) (Single) JAN-6189=12AU7WA Sylvania NOS 1968 (8.2/9.4ma)
(!!!) JHS-6189=12AU7WA Sylvania NOS 1965 in white box (10/9ma)
(!!!) JHS-6189=12AU7WA Sylvania NOS 1966 in white box (9.5/9.6ma)
(!!!) (Single) 5814A=12AU7 GE NOS 1960's rebranded 5814WA Penta Labs 1993 (8.8/8.4ma)
(!!!) (Single) 5814A=12AU7 GE NOS 1960's rebranded 5814WA Penta Labs 1993 (9.6/8.8ma)
(!!!!) (Single) JAN-6189W=12AU7 Philips by Sylvania NOS 1987 (8.2/8.8ma)
(!!!!) (Best Single #2) 12AU7=ECC82 Mullard UK shield logo NOS 1965 (11.2/12.6ma) (smooth rich sound)
(!!!!) (Single 1961) 12AU7=ECC82 Mullard BVA UK shield logo NOS 1961 (7.5/9ma) (Gf1 series) (smooth rich sound)
(!!) 12AU7A Sylvania NOS 1970 (8.8/9.2ma)
