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(!!!!) (Pair #5) 6F6G Marconi Spain NOS 1949 (31.6ma and 32.0ma)
(!!!) (Best Pair) 6F6GT GE coated glass NOS 1951-1952 (36ma and 39.5ma)
(!!!) (Best Pair) 6F6GT Sylvania and Sylvania Philco NOS 1950-1952 (40ma and 41.5ma) (close Gm)
(!!!) (Best Pair) 6F6GT Sylvania branded GE NOS 1962-1964 (39.5ma and 41ma) (close Gm)
(!!!) (Best Single) 6F6G Tungsol NOS 1950 (37.2ma)
(!) 6F6G Sylvania Philco NOS 1949 (36.5ma)
(!) 6F6G=VT-66A Sylvania used/tests like new 1940's (45ma)
(!) 6F6GT GE Coronado NOS 1956 (36.8ma)
(!) 6F6GT Sylvania Philco NOS 1950 (43.5ma)
1613=VT-175=6F6 RCA NOS 1963 (42ma)
1621=6F6 selected for long life RCA NOS
6F6 GE metal can NOS 1952 (38ma)
6F6G National Union black plate NOS 1951 (40.5ma)
6F6G National Union used/good mid-1940's (47ma)
6F6G RCA Cunningham used/good 1947 (31ma)
6F6G RCA NOS 1949 (35.8ma)
6F6G RCA NOS 1957 (37ma)
6F6G RCA NOS 1957 (42.2ma)
6F6G RCA Victor used/75% 1940's (28ma)
6F6G RCA Victor used/strong 1940's (37ma)
