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(!!!!) (Best Overall Pair) 6FQ7 RCA clear top NOS "D" getter halo 1969 (8.2/8.0ma and 8.0/7.8ma) (close Gm)
(!!!!) (Best Value Pair) 6FQ7 RCA clear top used/good 1964-1967 (6.0/5.8ma and 6.2/5.4ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!) (Good Value Pair) 6FQ7 Philips by Sylvania NOS 1980 era (6.2/6.0ma and 6.0/6.2ma)
(!!!) (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)
