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(!!!!) (Best Overall Pair) 6528 Raytheon graphite plates NOS and like new 1970 era (125ma/135ma and 119/129ma)
(!!!!) (BEST OVERALL Pair) 8068 GE NOS 1983 (46ma and 46ma)
(!!!!) (Best Overall) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (113ma/119ma) (close triode section balance)
(!!!!) (Best Pair #1) 5763 Sylvania JAN NOS 1972-1973 (46ma and 47ma)
(!!!!) (Best Pair #1) 6BQ5=EL84 GE NOS 1959-1961 (50.5ma and 52.5ma)
(!!!!) (Best Pair #1) 6LQ6=6JE6C Raytheon Japan NOS 1970's (112ma and 109ma)
(!!!!) (Best Pair #1) 7868 Sylvania tipped top used/tests like new 1960's (65ma and 66ma) (strong mA and Gm)
(!!!!) (Best Pair #1) ECL86=6GW8 Siemens Halske branded Telefunken Germany NOS 1971 (1.0/1.1ma and 44ma/45.5ma) 1-3% matched
(!!!!) (BEST PAIR #1) EL37 Mullard UK branded Amperex gray plates used/strong 1968 (78ma and 76ma)
(!!!!) (BEST PAIR #1) EL84 Siemens Halske Germany NOS 1977 (46.5ma and 46ma)
(!!!!) (Best Pair #2) 6AQ5A GE NOS 1974-1981 (50ma and 52ma)
(!!!!) (Best Pair #2) 6BQ5 GE NOS 1966-1980 same build (58.5ma and 60ma)
(!!!!) (Best Pair #2) 6L6G MULLARD UK NOS 1959 (69.0ma and 66.5ma) (close Gm)
(!!!!) (Best Pair #2) 71A Sylvania NOS 1946-1947 branded Hytron (23.4ma and 22ma)
(!!!!) (Best Pair #2) ECL86=6GW8 Siemens Halske branded Telefunken Germany NOS 1971 (1.0/1.1ma and 33ma/31.5ma) 1-3% matched
(!!!!) (BEST PAIR #2) EL37 Mullard UK branded Amperex gray plates used/good 1968 (73.5ma and 72ma)
(!!!!) (Best Pair #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (84ma/104ma and 91ma/95ma) (close Gm balance)
(!!!!) (Best Pair #2) JAN-6528A Cetron USA test like new 1987-1989 (102/110mA and 104/106.5ma)
(!!!!) (Best Pair #3) 5763 Sylvania JAN NOS 1974 (33ma and 34ma)
(!!!!) (Best Pair #3) 5881 Tungsol used/good 1960's (63.2ma and 66ma)
