(!!!!!) (Best Sylvania pair) JAN-CHS-6SN7WGT Sylvania chrome top NOS 1952 (7.6/7.8ma and 7.2/8.6ma) (low noise, detailed, good extension) (High Gm)
(!!!!) (Best Single) 6SN7WGT Sylvania "Chrome Top" brown base NOS 1952 (10/9.4ma) (close Gm)
(!!!!) (Good Value Single) 6SN7GTA GE "U" getter halo used/good 1954 (6.0/6.4ma)
(!!!) (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)
(!!!) 6SN7GTA Sylvania "chrome top" TALL bottle used/good 1950 era (6.2/6.2ma)
(!!) 6SN7GTA RCA branded CAPEHART used/like new 1955 (8.4/9.8ma)
(!!) 6SN7GTB RCA low hours/like new 1962 (8/10ma) (Gm like new)
(!!) 6SN7GTB Sylvania used/75% 1960's (6.0/6.4ma)
(!) JAN-CLRV-6SN7WGTA GE Canada brown base NOS 1970 (7/10ma)