(!!!!!) (BEST Pair) ECC81=12AT7 Mullard UK NOS 1970-1973 (9.0/9.2ma and 8.8/9.8ma)
(!!!!!) (Best Pair) JAN-12AT7WC Sylvania black plates NOS 1976 (11.2/12.2ma and 11.2/11.0ma)
(!!!!!) (Recommended Pair) JAN-12AT7WC GE gray plates NOS 1972-1979 (9.6/11.8ma and 8.6/12.4ma)
(!!!!) (Best Brimar Single 1967) CV4024=12AT7WA Brimar NOS square black plates 1967 (11.2./11.4ma)
(!!!!) (Best Brimar Single) CV4024=12AT7WA Brimar NOS square black plates 1975 (13.4/13.6ma)
(!!!!) (Best RCA Pair) 12AT7 RCA NOS 1972 (10.4/10.8ma and 10.0/10.2ma)
(!!!!) (Best RCA Single 1964) 6201=12AT7WA RCA black plates NOS 1964 (9.8/7.4ma) (best tone)
(!!!!) (Best Siemens Pair) 12AT7=ECC81 Siemens Halske Germany branded "SATOR" NOS 1964 (9.0/9.3ma and 9.2/10ma) (close Gm)
(!!!!) (Best Value Pair) JAN-12AT7WC GE gray plates NOS 1982 (7.5/9ma and 8/9.4ma)
(!!!!) (Recommended Pair) 12AT7 RCA gray plates NOS 1965-1968 (9.2/9.4ma and 8.6/9.8ma) (Fender, VTL, Croft)
(!!!!) (Recommended Pair) JAN-12AT7WC GE gray plates NOS 1975-1978 (7.2/8.2ma and 7.0/8.8ma)
(!!!!) (Recommended Pair) JAN-12AT7WC GE gray plates NOS 1978-1979 (9.8/10.4ma and 10/11.4ma)
(!!!!) (Recommended Pair) JAN-12AT7WC Sylvania black plates NOS 1978 (8.0/8.4ma and 8.2/9.4ma)
(!!!!) (Recommended Pair) JAN-12AT7WC Sylvania black plates NOS 1978 (8.7/10.8ma and 8.4/10.6ma)
(!!!!) (Recommended Pair) JAN-12AT7WC Sylvania black plates NOS 1978-1979 (8.6/12.4ma and 9.0/11.8ma)
(!!!!) (Recommended Pair) JAN-12AT7WC Sylvania black plates NOS 1980-1981 (8.8/9.8ma and 8.4/9.4ma)
(!!!!) (Recommended Single) 12AT7 Brimar UK branded IEC Mullard black plates "O" getter halo copper grid posts NOS 1967 (9.8/9.6ma)
(!!!) (3rd Best Pair) USN-12AT7WB=6201 GE gray plates "U" getter triple mica 1959 (9.2/7.2ma and 8.5/7.5ma) (BEST 6201)
(!!!) (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)