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(!!!!) (Best Single) 6SN7GTB RCA branded GE NOS 1970 (9.0/9.2ma)
(!!!!) (Best Single #3) 6SN7GTB RCA branded Wards Super Airline NOS 1959 (9.0/9.2ma)
(!!!!) (Best Single #2) 6SN7GTB RCA NOS 1961 (9.6/10ma) (same Gm)
(!!!!) (Best Single #4) 6SN7GTB RCA NOS 1964 (9.2/8.0ma)
(!!!!) (Single) 6SN7GT RCA NOS 1954 (7.8/7.6ma)
(!!!!) (Best Value Single) 6SN7GTB RCA NOS 1964 (8.4/7.2ma)
(!!!!!) (Best Single #2) 6SN7GTB Tungsol TALL bottle NOS "O" getter 1960 era (7.6/7.6ma)
