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(!!!) (Best Single) 6FQ7 RCA clear top NOS 1966 (7.2/8.2ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!) (Best Single) 6FQ7 RCA clear top NOS 1970 (9.0/9.2ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!) (Pair) 6FQ7 RCA clear top NOS "O" getter halo 1970's (6.6/6.0ma and 6.0/6.4ma) (close Gm)
(!!!) (Recommended Pair) 6FQ7 Sylvania NOS 1970's same build (6.4/6.8ma and 6.4/6.4ma)
(!!!) (Single) 6FQ7 RCA clear top NOS 1966 (6/7ma) (STAX, MARANTZ, CONRAD JOHNSON) (Copy)
(!!) (BEST SINGLE) 6CG7 RCA clear top chrome shield NOS 1960's (10ma/9.4ma)
6CG7 Sylvania Emerson used/good chrome electrostatic shield between plates "U" getter 1957 (6.2/6.8ma)
