(!!!) (Best Value) 12AT7 Amperex Mullard UK NOS 1971 (7.5/11.2ma)
(!!!!!) (Recommended Pair) JAN-12AT7WC GE gray plates NOS 1972-1979 (9.6/11.8ma and 8.6/12.4ma)
(!!!!) (Best Siemens Pair) 12AT7=ECC81 Siemens Halske Germany branded "SATOR" NOS 1964 (9.0/9.3ma and 9.2/10ma) (close Gm)
(!!!!) (Recommended Pair) JAN-12AT7WC Sylvania black plates NOS 1978 (8.7/10.8ma and 8.4/10.6ma)
(!!!) (Recommended Pair) 12AT7 RCA gray plates NOS 1960's (7.2/8.0ma and 8.0/8.2ma)
(!!!) (Best 12AT7WC Single) JAN-12AT7WC Sylvania black plates NOS 1978 (9/10ma)
(!!!) (Best Overall Single) E81CC=12AT7 Siemens double mica NOS 1976 (11.4/12ma) (high Ma and Gm)
(!!!) (Good Value Single) ECC81=12AT7 Mullard old logo made in Hyperlec Brive France used/good (8.4/9.8ma)
(!!!) (Good Value) E81CC=12AT7 Haltron England NOS around 1960 (8.4/10.2ma)
(!!!) (Recommended Pair) 12AT7 GE gray plates NOS 1977 (8.0/8.8ma and 8.2/8.8ma)
(!!!) (Recommended Pair) JAN-12AT7WC GE gray plates NOS 1972-1975 (8.8/9.0ma and 8.4/8.6ma)
(!!!) (Recommended Siemens Single) ECC81=12AT7 Siemens branded Mullard NOS circa 1970 (10.0/10.8ma)
(!!!) (Recommended Single) 12AT7 Fisher Telefunken Germany <> bottom NOS 1964 (7ma/11ma) (recommended for mic)
(!!!) (Recommended Single) 12AT7=ECC81 Mullard branded Raytheon NOS 1972 (13.2/11.0ma)
(!!!) (Recommended Single) 12AT7=ECC81 Siemens Halske Germany large "U" getter NOS 1957 (7.3ma/8.6ma)
(!!!) (Recommended Single) 12AT7=ECC81 Siemens Halske Germany branded "SATOR" NOS 1964 (8.2ma/8.2ma) 1-2% section balance
(!!!) (Recommended Single) 12AT7=ECC81 Siemens Halske Germany NOS branded VALVO 1966 (9.0ma/10.6ma)
(!!!) (slightly microphonic) ECC81=12AT7 Miniwatt by Mullard NOS 1970 (9.6/10.6ma)
(!!!) (Recommended Single) 12AT7WC GE NOS 1975 (10.6/12.2ma)
(!!!!) (Best Overall Single) ECC81=12AT7 Philips Miniwatt France by La Radiotechnique NOS 1962 (8.8/8.8ma) 1-2% section balance
