(!!!!) (Good Value Pair) 6FQ7 Philips by Sylvania NOS 1980 era (6.2/6.0ma and 6.0/6.2ma)
(!!!!) (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)
(!!!) (Best Overall Pair) 6FQ7 RCA clear top NOS 1964-1966 (8.8/9.4ma and 8.2/9.4ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!) (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)
(!!!) (Recommended Pair) 6FQ7 Sylvania NOS 1970's same build (6.4/6.8ma and 6.4/6.4ma)
(!!) 6FQ7 RCA clear top NOS 1976 (7ma/8ma)
6CG7 Sylvania Emerson used/good chrome electrostatic shield between plates "U" getter 1957 (6.2/6.8ma)
