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E80CF=7643 Valvo Germany branded Philips 1970 (11.4/9.0ma)
(!!!!!) (Best Pair #1) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (11.2/10ma and 11.2/9ma) (best sound)
(!!!!!) (Best Overall Pair) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (11.6/11.4ma and 11.8/10.6ma) (same Gm) (best sound)
(!!!!!) (Best Pair #2) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (11.5/9.6ma and 12.2/9.5ma) (best sound) 1-3% matched
(!!!!!) (Best Overall Single #1) ECF80=6BL8 Telefunken Germany NOS 1971 (14.0/11.5ma) (Highest mA and Gm)
(!!!!!) (Best Overall Single #2) ECF80=6BL8 Telefunken Germany NOS 1971 (13.2/9.8ma) (best sound)
