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7591 Tungsol used good 1963 (55ma, Gm=8100)
7591A Sylvania branded RCA used/75% 1968 (51ma, Gm=7,600)
7591A Sylvania branded RCA used/tests like new 1970's (62.5ma, Gm=10,200)
7591A Sylvania used/good 1970's (54ma, Gm=9000)
