(!!!!) (Best Siemens Pair) 12AT7=ECC81 Siemens Halske Germany branded "SATOR" NOS 1964 (9.0/9.3ma and 9.2/10ma) (close Gm)
(!!!) (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 Single) 12AT7WC GE NOS 1975 (10.6/12.2ma)
(!!) (Good Value Single) 6201=12AT7 Valvo Germany rebranded Philips SQ 1970 (6.8/7.8mA)
(!!) (Recommended Single 1961) JLRV-12AT7WA=6201 GE Canada gray plates triple mica "U" getter NOS 1961 (9/12ma)
(!!) (slightly microphonic) JHS-12AT7 Sylvania black plate "D" getter 1953 (11.2ma/11.2ma) 1% section balance
(!) (~ Best Value ~) JG-12AT7WA=6201 GE gray plates triple mica "U" getter low hours/like new 1958 (8.8/10.6ma)
(!) 6201=12AT7WB GE gray plates NOS 1969 (6.2ma/6.6ma)
(!) JG-12AT7WA=6201 GE black plates triple mica "U" getter used/strong 1955 (10ma/15ma)
(!) JG-12AT7WA=6201 GE NOS gray plates 1963-1964 (7ma/7.2ma)
(slightly microphonic) 6201=12AT7 RCA black plates NOS 1976 (11/12.4ma)
12AT7=E81CC=6201 Siemens triple mica NOS 1971 (12/15.8ma)
12AT7WA=6201 GE NOS gray plates 1965 (7.8ma/10.6ma)
6201=12AT7 GE "5 STAR" used/good triple mica "U" getter halo, copper grid posts, gray plates, 1957 (6.2/7.8ma)
(!!) (Recommended Single) 6201=12AT7WA GE "5 STAR" NOS 1970 (8.0/9.2ma)
(!!!!) (Best RCA Single 1964) 6201=12AT7WA RCA black plates NOS 1964 (9.8/7.4ma) (best tone)
(!!!) (Best Value Pair) JAN-12AT7WC GE gray plates NOS 1970 (7.0/7.6ma and 7.0/8.2ma)
(!!!) (Best Value Pair) 12AT7WB=6201 GE NOS 1965-1969 (6.0/7.4ma and 6.0/7.2ma)
(!!!!) (Best Value Pair) JAN-12AT7WC GE gray plates NOS 1982 (7.5/9ma and 8/9.4ma)