(!!!!!) (2nd Best Telefunken Pair) 12AU7=ECC82 Telefunken Germany smooth plates NOS 1966 and 1972 1-3% matched (9.6/10.6ma and 10.2/10.8ma)
(!!!!!) (Best 12AU7 Single) 12AU7 Amperex Bugle Boy England by Mullard "long plates" and "O" getter 1959 (11ma and 12ma) High Ma and Gm - close triode balance
(!!!!!) (Best Telefunken Pair) 12AU7=ECC82 Telefunken Germany smooth plates NOS 1972 1-3% matched (9.4/10ma and 9.6/9.6ma)
(!!!!!) (Recommended Pair) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS "Tektronix Checked" 1960's (9.0/11.6ma and 9.3/11.0ma) 2% matched (low noise)
(!!!!!) (Recommended Single) 12AU7 Amperex Bugle Boy England by Mullard "long plates" and "O" getter 1959 (9.0ma and 12.2ma)
(!!!!) (Best RCA Single) 12AU7 RCA tall gray ribbed plates "D" getter NOS mid-1950's (8.8/9.0ma)
(!!!!) (Best Tungsol Pair) 12AU7A Tungsol NOS 1963-1964 3-4% matched (high Gm and Ma)
(!!!!) (Recommended Pair) 12AU7=ECC82 Brimar England NOS ribbed plates large "O" getter halo 1960 (7.8/8.5ma and 7.4/8.3ma)
(!!!!) (Recommended Pair) 12AU7A RCA clear top used/very good 1960's (9.2/10.8m and 9.6/10.2ma) (Highest Ma and Gm)
(!!!!) (Recommended Single) 12AU7=ECC82 Brimar UK NOS ribbed plates large "O" getter halo 1960 (8.2/8.6ma)
(!!!!) (Recommended Single) 12AU7=ECC82 Brimar UK NOS ribbed plates large "O" getter halo 1960-1961 (9.4/10ma)
(!!!!) (Recommended Single) 12AU7=ECC82 Brimar UK NOS ribbed plates large "U" getter halo 1963 (8.7/10.2ma)
(!!!!) (Recommended Single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1972 (11ma/14ma) (Highest ma and Gm)
(!!!!) (Recommended Single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS Tektronix Checked 1960's (8.2ma/8.6ma)
(!!!!) (~ Recommended Single~) 12AU7=ECC82 Siemens Holland NOS 1965 (10.2/11.2ma)
(!!!) (#1 12AU7 Raytheon 1958) 12AU7 Raytheon Black Ribbed Plates NOS 1958, "D" getter halo, very good printing (9.2/10ma)
(!!!) (#1 12AU7 Raytheon 1958) 12AU7 Raytheon Black Ribbed Plates NOS 1958, "O" getter halo, very good printing (10.2/10.6ma)
(!!!) (#1 12AU7 Siemens Single) E82CC=12AU7 Siemens Germany double mica NOS 1980 boxed in 1986 (10.6/11.0ma) 1-3% section balance
(!!!) (#1 12AU7 Siemens Single) E82CC=12AU7 Siemens Germany double mica NOS 1980 boxed in 1986 (9.8/10.0ma) 1-2% section balance
(!!!) (#1 12AU7A Raytheon 1957) 12AU7A Raytheon Black Ribbed Plates NOS 1957, "D" getter halo, good printing (8.8/10.8ma)
