(!!!!) (2nd Best Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (5.8/6.1ma and 58/62ma)
(!!!!) (Best Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (5.5/5.2ma and 52/56ma)
(!!!!) (Recommended Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (4.9/4.6ma and 42/43ma)
(!!!) (2nd Best Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1971 (4.9/5.2ma and 59/56ma)
(!!!) 6DE7 GE Canada black plates NOS 1967 (4.6/42ma) (Woo Audio)
(!!!) 6DE7 Sylvania black plates "U" getter NOS 1950's (8/31ma) (Woo Audio)
(!!) (Best Single) 6EW7 Sylvania BIG BOTTLE NOS 1960's (7.8/56ma) (highest Ma and Gm)
(!!) 6EW7 GE PHILCO BIG BOTTLE black plates NOS 1964 (4.8/62ma)
(!!) 6EW7 Sylvania BIG BOTTLE branded GE NOS 1960's (3.5/36.5ma)
(!) (#2 6EW7 Single Tube) 6EW7 GE Japan BIG BOTTLE NOS 1960's (5.0/37ma)
(!) 6DE7 GE Admiral black plates NOS 1965 (4.5/27ma) (Woo Audio)
6DE7 RCA NOS 1960's (4.5/34ma)
6DE7 RCA NOS 1966 (5.2/40ma)
6DE7 Sylvania NOS 1960's (5.3/27ma)
6EW7 Daystrom by RCA BIG BOTTLE used/70-80% 1960's (4.5/32ma)
6EW7 RCA BIG BOTTLE black plates NOS 1961 era (5.4/42ma)
6EW7 RCA BIG BOTTLE NOS 1960's (5.6/36ma)
