(!!!!!) (Best Value Pair) 12AU7A RCA NOS 1964-1965 (8.2/11ma and 8.8/10.4ma)
(!!!!!) (Recommended Pair) 12AU7A RCA clear tops NOS 1960 (13/10ma and 11/11.5ma)
(!!!!) (Best Pair #2) 6FQ7 RCA clear top NOS 1966-1971 (7.2/8.2ma and 8.0/8.2ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!) (Best Pair) 12AU7A RCA clear top NOS 1960's (10/8.5ma and 9.4/8.8ma) (same Gm)
(!!!!) (Good Value Pair) 6FQ7 RCA clear top NOS 1970's (6.0/7.0ma and 6.6/7.6ma) (same Gm) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!) (Recommended Single) 12AU7A RCA clear top NOS 1969 (10.6/12.0ma)
(!!!) (Best Overall Pair) 6FQ7 RCA clear top NOS 1964-1966 (8.8/9.4ma and 8.2/9.4ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!) (Best Overall Pair) EL36 Haltron Japan clear top NOS 1960's (94ma and 93.5ma)
(!!!) (Best Pair #2) 6FQ7 RCA clear top NOS "D" getter halo 1966-1969 (7.6/8.0ma and 7.5/7.8ma) (same Gm) 1-3% matched
(!!!) (Best Pair #3) 6FQ7 RCA clear top NOS "D" getter halo 1965-1966 (7.4/7.6ma and 7.0/7.8ma) (same Gm)
(!!!) (Best Single) 12AU7A RCA clear top NOS 1973 (10.8/11ma) (same Gm)
(!!!) (BEST VALUE PAIR) 12AU7A RCA Bell and Howell and RCA clear top used/good 1960's (8.4/9.0ma and 8.0/8.6ma)
(!!!) (Best Value Pair) 12AU7A RCA NOS 1960's faded printing (9.3/11.8ma and 10.6/9.0ma)
(!!!) (Good Value Pair) 12AU7A RCA clear top used/good 1960's (7.5/9.6ma and 7.5/9.2ma)
(!!!) (Good Value Pair) 12AU7A RCA clear top used/good 1960's (8/10ma and 8/9.5ma)
(!!!) (Recommended Single) 12AU7A RCA clear top used/like new "D" getter halo 1960's (9.0/10.8ma)
(!!) (BEST VALUE SINGLE) 12AU7A RCA clear top used/good 1960's (8.0/9.4ma)
(!!) (Recommended Single) 12AU7A RCA top getter NOS 1970 era (10.2/11ma)
(!!) 12AU7A CBS black plates NOS 1960 era (9.5/11.8ma)
(!!) 12AU7A RCA clear top used/good 1960's (7.4/8.6ma)
