(!!!!!) (BEST PAIR) 7591A Sylvania NOS 1968-1971 (72ma and 74ma)
(!!!) (Best Overall Pair) 7591A GE coin-base NOS original boxes 1981 (70ma and 72.8ma)
(!!!) (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)
(!!) (Recommended Pair) 7591A Sylvania used/tests like new 1960's (60.6ma and 64.5ma)
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 NOS 1972 (72ma, Gm=10,600)
7591A Sylvania branded RCA used/good 1973 (43ma, Gm=8100)
