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)
(!!!!!) (Best Overall Pair 1965) 12AU7=ECC82 Mullard UK NOS branded Philips 1965 (10/10.3ma and 9.8/10.0ma) (same Gm) (Rogue, Hovland, Audio Note)
