(!!!!) (Best GE Pair #2) 6BX7GT GE "O" getter gray plates 1960's (50/56ma and 53/59ma)
(!!!) (#1 6BX7GT RCA single) 6BX7GT RCA NOS 1961 (41/48ma)
(!!!) (Best Single 1953) 6BX7GT Philco by Sylvania "D" getter halo 1953 (56/63ma)
(!!!) (Best Single 1953) 6BX7GT Raytheon by GE "D" getter halo 1953 (58/68ma)
(!!!) (Best Single 1956) 6BX7GT GE "D" getter NOS 1956 (53ma/50ma)
(!!!) (Best Single 1958) 6BX7GT GE "D" getter halo 1958 (92/87ma)
(!!!) (Recommended Pair) 6BX7GT GE branded RCA NOS 1958 and 1963 (47ma/52ma and 45/50ma)
(!!!) (Recommended Single) 6BX7GT GE "O" getter gray plates 1963 (71/76ma)
(!!!) (Recommended Single) 6BX7GT GE branded Westinghouse "O" getter gray plates 1960's (43/48ma)
(!!!) (Recommended Single) 6BX7GT GE branded Westinghouse black plates NOS "O" getter 1962 (71/79ma)
(!!) (Best Single) 6BX7GT GE branded Tungsol black plate "D" getter NOS 1957 (53ma/57ma) (High Gm)
(!!) 6BX7GT GE branded RCA NOS "D" getter 1958 (70ma/95ma)
(!!) 6BX7GT Sylvania "D" getter halo NOS 1950's (44/46ma) (close triode balance)
(!!) 6BX7GT Sylvania black plates NOS 1960's (56ma/76ma)
(!!) 6BX7GT Sylvania branded GE black plates 1967 (44ma/61ma)
6BX7GT CBS NOS 1959 (53ma/73ma)
6BX7GT GE branded Tungsol NOS "D" getter 1957 (48ma/53ma)
