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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 Pair) 12AU7 Mullard UK NOS 1972 (11.8/11.0ma and 11.5/11.2ma) (Rogue, Hovland, Audio Note)
(!!!!) (Best Pair) 5751 Siemens Halske Germany triple mica NOS 1966 (2.6/2.6ma and 2.4/2.7ma)
(!!!!) (Best Single 1957) ECC83=12AX7 Mullard UK long plates "D" getter NOS 1957 (mC1 series) (1.1/1.1ma) 1% section balance
(!!!!) (Best Overall Pair) 6973 RCA NOS 1975 (42.4ma and 43ma)