(!!) 6SN7GTB Realistic JAPAN NOS tall gray ribbed plates 1960's (8/8.2ma)
(!!) 6SN7GTB Sylvania used/75% 1960's (6.0/6.4ma)
(!!!!) (Recommended Pair) 6SN7GTB RCA branded GE NOS 1966-1967 (10.4/10.6ma and 10.2/11.6ma) (smooth presentation)
(!) (Good Value) 6SN7GTB CBS black base black plates side-getter NOS, the same shape as Sylvania 6SN7GTB 1960 (6.8/7.2ma)
(!) (SINGLE) 5692 RCA RED BASE rebranded GL-5692 GE used/good 1949 (8.2/7.6ma)
(!) (Good Single) 6SN7GTB Westinghouse USA gray plates "O" getter halo NOS 1961 (8.0/9.4ma)
(!) JAN-CLRV-6SN7WGTA GE Canada brown base NOS 1970 (7/10ma)
(!!!) 6SN7GTB Westinghouse black plates copper grid posts "D" getter 1950's (7.2/8.4ma)
(!!!!!) (Best Overall Pair) ECC33=6SN7GT Mullard UK black plates NOS pan shape getter halo 1950-1955 era (9.4/8.6ma and 9.4/8.4ma) 1-2% matched (best sounding ECC33 of all-time)
(slightly microphonic) 6SN7GT Hytron NOS 1948 (7/8ma)
(slightly microphonic) 6SN7GTA GE NOS 1952 copper grid posts (7.4/10ma)
(!!!!) (Best Single) JAN-CHS-6SN7W Sylvania "SHORT BOTTLE" NOS 1945 in Admiral box (8.2/8.0ma) (1-3% section balance)
(slightly microphonic) JAN-CHS-6SN7W Sylvania "SHORT BOTTLE" used/good 1945 (7.0/7.6ma)
(!!!!) (Good Value Pair) 8SN7GTB Sylvania GM Delco "chrome top" NOS 1957 same build (6.4/7.2ma and 7.4/6.2ma) (Schiit Freya, Rogue, Modwright OPPO, Cary) (1-5% matched)
(!!!!) (Recommended Pair) 6SN7GTB Sylvania chrome top gray plates 1950's used/very good (9.6/9.0ma and 8.6/8.2ma) (Gm like new)
(!!!!!) (Best Value Pair) 6SN7GTB RCA NOS and like new 1965 (8.2/10.2ma and 8.2/9.2ma) (same Gm) (warm and smooth)
(!) 6SN7GT Westinghouse USA black plates NOS 1950 era (7.0/11.0ma)
(!!!!!) (Best Value Pair) 6SN7GTB Sylvania "chrome top" NOS and like new 1956 (8.1/8.6ma and 7.8/8.6ma) (strong Gm)
(!!!!!) (Best Value Pair) 6SN7GTB GE NOS 1955-1964 same build (6.1/6.5ma and 6.0/6.3ma)
(!!!!) (Good Value Pair) 6SN7GTA GE NOS "U" getter halo - side getter - copper grid posts 1953 (6.0/7.2ma and 6.0/7.2ma) 1-2% matched
