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(!!!!) (Best Overall Pair) ECC82=12AU7 Telefunken Germany <> Bottom smooth plates NOS 1964-1968 (10.6/10.2ma and 10.5/10.8ma) (High mA and Gm)
(!!!!) (Best RCA Pair) 12BH7A RCA gray ribbed plates NOS 1970 (12.6/13.6ma and 12.0/14.5ma) (Highest mA and Gm) (Wells, McIntosh)
(!!!!!) (Best Pair) 12AU7 Mullard UK NOS 1972 (11.8/11.0ma and 11.5/11.2ma) (Rogue, Hovland, Audio Note)
(!!!) (Best Pair) JAN-CEA-5852=6X5GT Bendix NOS 1953 (Best Audio Grade 6X5GT)
(!!!!) (Best Overall Pair) 6973 RCA NOS 1975 (42.4ma and 43ma)