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(!!!!!) (SINGLE) 7581A=6L6GC GE brown base like new 1967 reboxed (76ma) (rare)
(!!!!) (Best Single #2) 7581A GE NOS 1979 (87ma)
(!!!!) (Best Single #3) 7581A GE NOS 1979 (76ma)
7581 Tungsol brown base used/75% 1964 (52.5ma)
7581A GE branded RCA used/good 1973 (56ma)
7581A GE used/good 1974 (59ma)
