(!!) (Recommended Pair) 6LF6 Sylvanbia NOS same build 1970 era (117ma and 122ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
6LF6 Amperex Holland Big Bottle NOS 1967 (140ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
6LF6 GE NOS 1982 crack in bottom mica (113ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
6LF6 JAPAN Big Bottle Euro style construction used/good (114ma)
6LF6 Sylvania branded RCA NOS (137ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
6LF6 Sylvania NOS (115ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
6LF6 Sylvania used/strong (137ma)
6LX6 GE used/strong (130ma)
6LX6=6LF6 GE branded Westinghouse NOS (82ma)
6LX6=6LF6 GE NOS (75ma)
6LX6=6LF6 Sylvania Philips NOS (91ma)
6LX6=6LF6 Sylvania Philips NOS 1970 era (123ma)
