(!!!!) (Best Value Pair) 6FQ7 RCA clear top NOS 1967 (6.2/6.0ma and 6.0/7.4ma) (same Gm) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!) (Good Value Pair) 6FQ7 Philips by Sylvania NOS 1980 era (6.2/6.0ma and 6.0/6.2ma)
(!!!) (Best Pair) 6FQ7 RCA clear top NOS "D" getter halo 1966-1969 (7.2/8.2ma and 8.0/7.8ma) (close 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)
