(!!) (Best Value Single) 6SN7GT RCA used/very good 1954 (7.0/8.5ma)
(!!) (Best Value Single) 6SN7GTB RCA used/good 1950's (7.0/7.6ma) (Gm the same)
(!!) 6SN7GTB RCA low hours/like new 1962 (8/10ma) (Gm like new)
(!!) 6SN7GTA Sylvania "chrome top" tall bottle used/good 1950 era (6ma/6ma) 1-2% section balance
(!!) (Recommended Single) 6SN7GTB RCA NOS 1965 (10.2/11.6ma)
(!!!!) (Best Single) 6SN7GTB RCA NOS 1958 side getter (9.6/9.8ma)
(!!!!) (Best Single) 6SN7GTB RCA NOS 1960 (10/11ma) (Highest Gm)
(!!) 6SN7GTB Tungsol black plates side getter like new 1956 (8.0/8.4ma)
(!!!!) (Single) JAN-CHS-6SN7W Sylvania "SHORT BOTTLE" 1945 low hours like new in Admiral box (7.8/9.8ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania chrome top gray plates low hours 1950's (8.6ma/8.4ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania NOS 1960's (7.2ma and 6.6ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania used/tests like new 1960's (8.2ma and 7.6ma)
(!!!!) (Good Value Single) 6SN7GTA GE "U" getter halo used/good 1954 (6.0/6.4ma)