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(!!!) (Best Overall Single) 6528A Cetron like new 1987 (138/144mA) (Highest mA and Gm)
(!!!) (Best Overall Single) 6528A Cetron NOS 1980 (132/139mA)
(!!) (Best Pair #3) 6528A Cetron USA NOS and like new 1989 (100/135mA and 100/128mA)
(!) (Best Pair #2) 6528A Cetron USA test like new 1987-1989 (102/110mA and 104/106.5ma)
(!) (Best Pair) 6528 Raytheon graphite plates NOS and like new 1970 era (125ma/135ma and 119/129ma)
6528A Cetron low hours/like new 1980 (97/134mA)
6528A Cetron tests like new 1979 broken guide pin (111/124mA)
6528A Cetron used/good 1979 broken guide pin (99/117mA)
6528A Cetron used/good 1987 (112/113mA)
6528A Cetron used/good 1989 slightly tilted glass (94/127mA)
