(!!) 6L6GAY Sylvania brown base NOS 1956 aged 48-hours (84.2ma)
(!) (Best Value Single) 6L6GC Sylvania NOS 1960's internals tilted (95ma)
(!) (Recommended Single) 6L6GC Sylvania NOS 1960's (63.5ma)
6L6GA National Union used/good/80% 1940's (56.4ma)
6L6GA Sylvania SESCO used/good 1950 in white box (56.5ma)
6L6GB GE Black Plate used/good 1957 (59ma)
6L6GB Sylvania Black Plate used/good 1955 faded top getter (57ma)
6L6GB Sylvania Black Plate used/good 1955 faded top getter (65ma) (high Ma and Gm)
6L6GC GE NOS 1964 broken center guide pin (61ma)
6L6GC GE tests like new 1964 broken center guide pin (87.5ma)
6L6GC GE Zenith low hours/like new 1960's in white box (61.5ma)
6L6GC Sylvania clear top NOS 1960's copper grid posts (68ma)
6L6GC Sylvania gray plate used/tests like new 1960's (66ma)
6L6GC Tungsol used/good around 1960 - broken center guide pin (73ma)
7581 Tungsol brown base used/75% 1964 (52.5ma)
7581A GE branded RCA NOS 1974 (59.5ma)
7581A GE branded RCA used/good 1973 (56ma)
7581A GE NOS 1979 (76ma)
7581A GE NOS 1979 (87ma)
7581A GE used/good 1974 (59ma)
