(!!!!!) (Best Value Pair) 6FQ7 RCA clear top NOS 1966-1968 (6/7ma and 6.8/7.2ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!!) (Recommended Pair) 6FQ7 RCA clear top NOS 1969-1970 (7.6/11ma and 8.6/10ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!!) (Recommended Pair) E80CF=7643 Valvo branded Philips Miniwatt SQ NOS 1963 (PREMIUM 6BL8 SUB) (Tuners)
(!!!!) (Good Value Pair) 6FQ7 RCA clear top NOS 1970's (6.0/6.4ma and 6.4/7.4ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!) (Best Overall Single) E90F=6BH6 Philips SQ Holland NOS 1968 (8.4ma)
(!!!) (Best Pair) 6AF4A Sylvania NOS 1965 (22.5ma and 22.8ma)
(!!!) (Best Pair) 6DZ4 GE NOS 1960's (23ma and 25ma)
(!!!) (Best Single) E80CF=7643 Valvo branded Amperex Germany PQ NOS 1961 (Premium 6BL8 SUB) (Highest mA and Gm)
(!!!) (Best Value Pair) E80CF=7643 Valvo Germany branded International NOS 1961-1963 (PREMIUM 6BL8 SUB) (Tuners) 1-5% matched
(!!!) (Best Value Pair) E80CF=7643 Valvo Germany branded International NOS 1962-1963 (PREMIUM 6BL8 SUB) (Tuners) 1-5% matched
(!!!) (Best Value Single) E80CF=7643 Valvo Germany branded International NOS 1961 (12.8/18mA) (PREMIUM 6BL8 SUB) (Tuners)
(!!!) (Best Value Single) E80CF=7643 Valvo Germany branded International NOS 1963 (10.8/13.4mA) (PREMIUM 6BL8 SUB) (Tuners)
(!!!) (Recommended Pair) 6DZ4 GE NOS 1960's (21ma and 22ma)
(!!!) (Recommended Pair) 6FQ7 Sylvania NOS 1970's (9.0/8.0ma and 8.0/7.6ma)
(!!!) (Recommended Pair) 6FQ7 Sylvania NOS 1970's same build (6.4/6.8ma and 6.4/6.4ma)
(!!) (Recommended Single) 6CG7 RCA chrome shield between plates NOS 1962 (7.0/7.3ma)
(!!) (Recommended Single) 6FQ7 RCA clear top NOS D getter 1970 (7.5/11ma)
(!!) 6FQ7 RCA clear top NOS 1963 (8.2ma/9.8ma)
(!!) 7693=E90F=6BH6 Philips Holland PQ NOS 1964 (6.4ma)
(!) (PAIR) 6DZ4 GE NOS 1960's (19ma and 19ma)