(!!!) (Recommended Pair) 7591A GE coin-base NOS original boxes 1981 (62ma and 62.5ma)
(!!!) (Recommended Pair) 7591A GE coin-base NOS original boxes 1981 (79ma and 83ma)
7591 Tungsol used good 1963 (55ma, Gm=8100)
7591 Westinghouse branded RCA NOS 1963 (51.5ma, Gm=9050)
7591A GE coin-base NOS 1970's (65.2ma, Gm=11,000)
7591A Sylvania branded RCA used/good 1973 (43ma, Gm=8100)