(!!!!) (Good Value Pair) 6FQ7 Philips by Sylvania NOS 1980 era (6.2/6.0ma and 6.0/6.2ma)
(!!!) (Best Value Pair) 6FQ7 GE NOS 1978-1979 (5.8/6.2ma and 5.6/6.6ma)
(!!!) (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)
(!!!) (Recommended Pair) 6FQ7 GE NOS 1973-1974 (6.5/8.4ma and 7.0/8.0ma)
(!!!!) (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)
(!!!!) (Single) 6CG7 Tungsol used/good 1960 era black shield between plates (7ma/7ma)
(!!!!) (Best Pair #2) 6FQ7 RCA clear top NOS 1966-1971 (7.2/8.2ma and 8.0/8.2ma) (STAX, MARANTZ, CONRAD JOHNSON)
(!!!!) (Recommended Pair) 6FQ7 Zenith by GE NOS 1977 (6.5/10.6ma and 6.7/9.2ma)
(!!!!) (Recommended GE Pair) 6FQ7 Zenith by GE NOS 1977 1-3% matched (7.0/7.6m and 6.8/7.5ma)
6CG7 Sylvania Emerson used/good chrome electrostatic shield between plates "U" getter 1957 (6.2/6.8ma)
6CG7 Sylvania gray plates NOS "U" getter 1958 with chrome electrostatic shield between plates (6.8ma/8.8ma)
6FQ7 Raytheon Japan branded Realistic Lifetime gold plated pins low hours/tests like new 1960's (6.4ma/6.6ma)
6FQ7 Realistic Lifetime Taiwan NOS gold plated pins 1970's
(!!!!) (Recommended Pair) 6FQ7 Zenith by GE NOS 1977 (6.2/8.0ma and 6.0/8.4ma)
(!!!!) (Best Pair) 6FQ7 Zenith by GE NOS 1977 (7.2/8.0ma and 7.0/7.8ma)
(!!!) (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
(!!) 6FQ7 RCA clear top NOS 1976 (7ma/8ma)
(!!) (BEST SINGLE) 6FQ7 RCA clear top NOS 1971 (8ma/8.2ma)
