(!!!!!) (Best Holland Pair) ECC82=12AU7 Philips Heerlen Holland NOS 1966 (10.2/10.4ma and 10.2/10.6ma) 1-2% matched (low noise)
(!!!!!) (Best Holland Pair) ECC82=12AU7 Philips Heerlen Holland NOS 1966 (10.2/10.8ma and 10.0/11.0ma) 1-2% matched (low noise)
(!!!!!) (Best Long Plates Pair) ECC82=12AU7 Valvo Hamburg Germany NOS with 17MM "long gray ribbed plates" and "O" getter 1958 (9.0/10.3ma and 9.6/10.4ma) (1-3% matched) (low noise)
(!!!!!) (Best Long Plates Single) ECC82=12AU7 Valvo Hamburg Germany NOS with 17MM "long gray ribbed plates" and "O" getter 1958 (8.8/10.0ma)
(!!!!!) (Best Overall Pair) 12AU7A RCA CMI clear top copper grid posts NOS 1969 1-3% matched (CMI=Chicago Musical Instrument Co.) (10.0/10.6ma and 10.2/10.4ma)
(!!!!!) (Best Tungsol Pair) 12AU7A Tungsol NOS 1963-1964 3-4% matched (high Gm and Ma)
(!!!!!) (Best Value Pair) 12AU7=ECC82 Brimar England NOS ribbed plates small "O" getter halo 1960-1961 (7.8/8.6ma and 8.0/9.0ma) 1-3% matched
(!!!!!) (Recommended Long Plates Pair) ECC82=12AU7 Valvo Hamburg Germany NOS with 17MM "long gray ribbed plates" and "O" getter 1958 same date codes (8.4/8.6ma and 8.4/8.8ma) (1-2% matched) (low noise)
(!!!!!) (Recommended Pair) 12AU7=ECC82 Brimar England NOS ribbed plates "U" getter halo 1962-1963 (10.2/12.5ma and 10.8/11.2ma) (High Gm)
(!!!!!) (Recommended Pair) 12AU7A RCA CMI clear top copper grid posts NOS 1969 (9.0/9.8ma and 9.2/9.6ma) 1-2% matched (CMI=Chicago Musical Instrument Co.)
(!!!!!) (Recommended Pair) 12AU7A RCA CMI clear top copper grid posts NOS 1969 (9.8/10.2ma and 9.5/10.5ma) 1-2% matched (CMI=Chicago Musical Instrument Co.)
(!!!!!) (Recommended Single) 12AU7 Telefunken Germany <> bottom NOS smooth plates 1967 (8.4ma/8.6ma)
(!!!!) (Best RCA Single) 12AU7 RCA tall gray ribbed plates "D" getter NOS mid-1950's (8.8/9.0ma)
(!!!!) (Recommended Holland Pair) ECC82=12AU7 Electronics for Medicine Holland test like new 1969 (9.6/10.2ma and 9.8/10.2ma) (very low noise)
(!!!!) (Recommended Pair) 12AU7=ECC82 Brimar England NOS ribbed plates large "O" getter halo 1961 (8.6/9.4ma and 8.8/9.2ma) 1-3% matched
(!!!!) (Recommended Pair) 12AU7=ECC82 Brimar UK ribbed plates NOS 1960's same internal build (9.6/11.2ma and 9.6/10.2ma)
(!!!!) (Recommended Pair) 12AU7A RCA clear top used/good 1960's (8.8/9.6ma and 8.5/8.7ma)
(!!!!) (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 "U" getter halo 1962-1963 incomplete top getter (9.4/9.8ma)
(!!!!) (Recommended Single) 12AU7=ECC82 Brimar UK NOS ribbed plates large "O" getter halo 1960-1961 (9.2/10.2ma)
