(!!!) (BEST OVERALL PAIR) 6SF5GT Tungsol NOS 1946 (1.1ma and 1.3ma)
(!) (Good Value Pair) 6SF5 RCA used/good 1948 Pair (0.8ma and 0.8ma)
(Best Single) 6SF5 GE NOS 1958 (2.1ma) (strong single)
(BEST SINGLE) 6SF5GT Tungsol NOS 1940's (1.1ma Gm=1500)
6SF5 GE used/good 1951 (1.1ma Gm=1200)
6SF5 Sylvania NOS 1960's (1.1ma Gm=1500)
6SF5 Sylvania used/good 1949 (0.8ma Gm=1100)
6SF5 Sylvania used/good 1950's (0.8ma Gm=1400)
6SF5GT Sylvania Philco NOS 1940's (1.1ma Gm=1100)
6SF5GT Tungsol NOS 1949 (0.7ma Gm=1350)
6SF5GT used
