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(!!!!) (Best Tungsol Pair 1959) 12AU7A Tungsol ribbed plates NOS "U" getter halo 1959 (8.5/8.8ma and 8.8/7.8ma)
(!!!!) (Best Value Single) 12AU7 Philips Miniwatt Holland like new 1961 large "O" getter halo (9.6/11ma)
(!!!!) (Best Value Single) 12AU7=ECC82 Philips by Mullard UK ribbed plates used/good 1969 (8.2/8.2ma) 1% section balance
(!!!!) (Best Value Single) ECC82=12AU7 Telefunken Germany <> Bottom ribbed plates NOS 1969 faded printing (10.8/10.0ma) (Highest Gm)
(!!!!) (Good Single 1950) 12AU7 Sylvania black plates "D" getter NOS 1950 (11/12.8ma)
(!!!!) (Recommended Single 1959) 12AU7 Mullard Heath UK long plates "O" getter used/good 1959 (8.8/9.0ma)
(!!!!) (Recommended Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/10.8mA)
(!!!!) (Single 1961) 12AU7=ECC82 Mullard BVA UK shield logo NOS 1961 (7.5/9ma) (Gf1 series) (smooth rich sound)
(!!!!) (Single) 12AU7 EI Yugoslavia (Telefunken copy) smooth plates branded Philips NOS 1974 (8.2/7.8ma) (High Gm)
(!!!!) (Single) 12AU7 RCA Italy ribbed plates NOS 1960's (8/10.6ma)
(!!!!) (SINGLE) 12AU7A GE NOS 1963 copper grid posts (8.9/10.2ma)
(!!!!) (SINGLE) 12AU7A GE NOS 1972 copper grid posts (10.6/9.8ma) (warm and smooth)
(!!!!) (SINGLE) 12AU7A GE NOS 1976 copper grid posts (9.4/8.8ma)
(!!!!) (Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.8/8.6ma)
(!!!!) (Single) JAN-6189W=12AU7 Philips by Sylvania NOS 1987 (8.2/8.8ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.2/9.8ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.8/10ma)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 very good printing (10.0/10.8ma) (high Gm)
(!!!) (BEST PAIR) JG-6189=12AU7WA GE double mica NOS 1963-1964 (10.2/12ma and 10.2/11ma)
(!!!) (BEST PRICE) 12AU7A GE used/good 1969 - 1980 (4 for $29.99)
