(!!!!!) (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) 6SN7GTB Tungsol tall bottle used/good 1960 era (7.5/7.5ma) 1% section balance
(!!) (Single) 6SN7GTB Tungsol NOS 1960 era (8.6/8.4ma)
(!!) 6SN7GTB Sylvania used/75% 1960's (6.0/6.4ma)
(!!) 6SN7GTB Tungsol black plates side getter like new 1956 (8.0/8.4ma)
(!) JAN-CLRV-6SN7WGTA GE Canada brown base NOS 1970 (7/10ma)