(!!) (1 Pair) 6SF5 RCA metal can NOS 1960 era (1.0ma and 1.1ma)
(!) (Good Value) 6SF5 Ken Rad used/good 1940's Pair
(!) (Good Value) 6SF5 Ken Rad used/good 1949 Pair
(BEST SINGLE) 6SF5GT Tungsol NOS 1940's (1.1ma Gm=1500)
6SF5 GE used/good 1951 (1.1ma Gm=1200)
6SF5 RCA NOS 1952 (1.3ma) (strong single)
6SF5 Sylvania NOS 1960's (1.1ma Gm=1500)
6SF5 Sylvania used/good 1950's (0.8ma Gm=1400)
