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(!!) (Good Value Single) ECC82=12AU7 Philips Holland used/good 1972 dimpled disc getter (8.4/8.8ma)
(!!!!) (Best Pair #1) 12AU7WA=6189 RT Radio Technique France NOS 1961 (9.2/9.2ma and 9.2/9.0ma) 1-2% matched
(!!!!) (Single) EF89=6DA6 Telefunken Germany <> bottom NOS 1966 (7.0ma)
(!!!) (Best Single) 7247=12DW7 Mullard UK rebranded RCA NOS 1972 (1.6ma and 14.5ma)
(!!!!) (Best Pair #3) 12AU7WA=6189 RT Radio Technique France NOS 1961 (8.4/9.2ma and 8.4/9.0ma) 1-3% matched
(!!!) (Recommended Black Plates) 12AU7A Westinghouse black plates 1960 era rebranded United 1981 "D" getter halo (8.4/9.8ma) (similar to RCA black plates)
(!!!) (SINGLE) 12AU7 RCA tall black plates "D" getter used/good 1950's (9.8/8.2ma)
(!!) (#1 12AU7 Raytheon from 1954) 12AU7 Raytheon gray ribbed plates "D" getter halo NOS 1954 (10.6/11.2ma)
(!!!!!) (Single 1956) CV491=12AU7 Mullard UK "long plates" with "D" getter 1956 like new a few scratches on the glass (10.2ma and 8.2ma) (smooth rich textured sound) (rare)
EF804 Telefunken Germany NOS 1960's (2.9ma)
(!!!!) (Good Single 1950) 12AU7 Sylvania black plates "D" getter NOS 1950 (11/12.8ma)
E83F=6689 Siemens Holland NOS 1963 (10.6ma)
E83F=6689 Amperex Holland NOS gold pins 1962 (9.2ma)
E83F=6689 Siemens made in Holland NOS 1966 (8.5ma)
(!!) (Single) 12AU7 Tungsol gray ribbed plates D getter NOS 1957 (11.5/8ma)
(!!) (Best Single) 12AU7A Westinghouse gray plates "O" getter halo 1960's NOS (10.6/11.2ma)
(!!!) (BEST PRICE) 12AU7A GE used/good 1971 - 1978 (4 for $29.99)
UABC80 Telefunken used
(!) (slightly microphonic single) 12AU7 Hitachi JAPAN branded IEC Mullard NOS ribbed plates 1968 (9.4/11ma)
EF804 Telefunken Germany NOS 1959 (2.4ma)
