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(!!!!) (Best Pair #1) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1971 (5.3/58ma and 5.4/55ma)
(!!!!) (Best Pair #2) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (4.9/42ma and 4.6/43ma)
(!!!!) (Best Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (5.0/63ma and 5.5/62.5ma) (Highest mA and Gm)
(!!!!) (Best Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (5.5/5.2ma and 52/56ma)
(!!!!) (Recommended Pair) 7N7 Sylvania branded GE chrome top NOS 1954-1956 (7.4/7.0ma and 7.4/7.2ma) 1-2% matched
(!!) (Best Single) 7N7 Sylvania branded Philco NOS parallel black plates 1940's (7.5/7.9ma)
(!!) 7N7 Sylvania branded Philco used/good short bottle parallel gray plates 1948 (7.2/7.6ma)
(!!) 7N7 Sylvania NOS 1960's (8.6/10.2ma)
(!) (Best Single) 7N7 Sylvania NOS 1960 era (10.8/11.2ma)
(!) (Good Single) 7N7 Sylvania branded GE NOS 1961-1962 (7.5/8.3ma)
13DR7 Sylvania branded GE NOS (1 pair)
6CY7 (sold out)
6S4 Sylvania black plate triple mica NOS "D" getter halo 1954 (28.2ma)
6S4A GE Admiral NOS 1965 (27.5ma)
6S4A GE Canada NOS 1965 (27ma)
6S4A Raytheon NOS 1961 (20ma)
6S4A RCA branded Sylvania black plate NOS 1960 era (20.6ma)
6S4A Sylvania NOS 1960's (20ma)
6S4A Sylvania triple mica NOS 1960's (20.2ma)
6S4A Tungsol branded GE NOS 1966 (21.5ma)
