(!!!!) (Best Pair) 6AC7 RCA NOS 1960's (11ma and 11.8ma)
(!!!!) (Best Pair) 6AC7 RCA NOS 1961-1962 (10.3ma and 10.6ma)
(!!!!) (Recommended PAIR) 6AC7 RCA NOS 1961 (11.4/12.4ma)
(!!!) (Recommended Pair) 6AC7 RCA NOS 1950's (11.5ma and 12.2ma)
(!!!) (Recommended Pair) 6AC7 RCA NOS 1970 era (10.0ma and 10.5ma)
(!!) (Best GE Pair) 6AC7 NOS 1960's - 1970's (13ma/13.5ma)
