(!!!!!) (2nd Best Pair 1960) 5814A GE "5 STAR" triple mica "O" getter halo 1960 (10.0/10.4ma and 10.0/9.2ma) (best audio grade 12AU7 SUB)
12AU7A Sylvania NOS 1970's (10.6/9.2ma)
12AU7A Sylvania NOS 1960 era (11.6/10ma)
(!!!!) (BEST OVERALL SINGLE) 12AU7A GE NOS 1958 copper grid posts (11.8/11.4ma) 1-3% section balance
(!!!!) (BEST SINGLE 1985) 12AU7A GE NOS 1985 copper grid posts (9.2/9.4ma) 1-2% section balance
(!!!!) (SINGLE) 12AU7A GE NOS 1976 copper grid posts (9.4/8.8ma)
(!!!!) (SINGLE) 12AU7A GE NOS 1972 copper grid posts (10.6/9.8ma) (warm and smooth)
