(!!!!) (#1 7868 Matched Quad) 7868 RCA NOS matched quad 1970 era (55ma, 55ma, 55ma, 57ma) (matched on Amplitrex)
(!!!!) (#1 7868 Sylvania Matched Quad) 7868 Sylvania NOS same build (64, 65, 67, 68ma) (matched on Amplitrex) (highest Ma and Gm)
(!!) (#1 7868 RCA Pair 7868 RCA NOS (57ma and 59ma) (matched on Amplitrex)
(!!) (#1 7868 RCA Pair 7868 RCA NOS (62ma and 65ma) (matched on Amplitrex)
(!!) (#1 7868 Sylvania PAIR) 7868 Sylvania NOS (75ma and 75ma) (matched on Amplitrex) (highest Ma and Gm)
(!!) (#2 7868 RCA PAIR) 7868 RCA tipped top NOS mid-1960's (54ma and 56.4ma) (matched on Amplitrex)
(!!) (#3 7868 RCA Pair 7868 RCA NOS 1976 (70ma and 76ma) (matched on Amplitrex)
(!) (#1 7868 GE Pair) 7868 GE NOS 1970's (46ma and 46.8ma)
(!) (#3 7868 Sylvania Pair) 7868 Sylvania NOS (58ma and 62ma) (matched on Amplitrex)
(!) (#3 BEST PAIR) 7868 Sylvania NOS (61ma and 61.5ma) (matched on Amplitrex)
(!) (#4 7868 Sylvania Pair) 7868 Sylvania NOS same build (47ma and 48ma)
7868 RCA black plate tipped top NOS 1963 (59.5ma)
7868 RCA gray plate tipped top NOS no printing 1960's (63ma)
7868 RCA NOS 1969 (64ma)
7868 RCA NOS 1969-1970 (45ma)
7868 RCA NOS 1969-1970 (55ma)
7868 Sylvania branded Philips NOS 1970's (65ma)
