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(!!!!!) (Best Overall Single #1) ECF80=6BL8 Telefunken Germany NOS 1971 (14.0/11.5ma) (Highest mA and Gm)
(!!!!!) (Best Pair) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (12.8/8.8ma and 11.7/9.0ma) (best sound)
(!!!!!) (Recommended Pair) E80CF=7643 Valvo branded Philips Miniwatt SQ NOS 1963 (PREMIUM 6BL8 SUB) (Tuners)
(!!!!) (Best Pair) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (12.5/10ma and 13.2/9.8ma) (best sound)
(!!!) (Best Holland Single) ECF80=6BL8 Amperex Bugle Boy Holland NOS 1957 (14ma/11ma)
(!!!) (Best Mullard Single) ECF80=6BL8 IEC Mullard UK NOS 1966 (16ma/12ma) (Highest mA and Gm)
(!!!) (Best Single) E80CF=7643 Valvo branded Amperex Germany PQ NOS 1961 (Premium 6BL8 SUB) (Highest mA and Gm)
(!!!) (Best Value Pair) E80CF=7643 Valvo Germany branded International NOS 1961-1963 (PREMIUM 6BL8 SUB) (Tuners) 1-5% matched
(!!!) (Best Value Single) E80CF=7643 Valvo Germany branded International NOS 1961 (12.8/18mA) (PREMIUM 6BL8 SUB) (Tuners)
(!!!) (Best Value Single) E80CF=7643 Valvo Germany branded International NOS 1963 (10.8/13.4mA) (PREMIUM 6BL8 SUB) (Tuners)
(!!) (Good Value Single) ECF80 VALVO FRANCE (La Radiotechnique) NOS 1962
(!) (Good Value Single) ECF80=6BL8 Telefunken Germany <> bottom like new 1971 (11.6/9.6ma)
(!) (Good Value Single) ECF80=6BL8 Telefunken Germany <> bottom used/good 1964 (10.0/10.2ma)
(!) (Single) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (14/9ma)
(!) E80CF Valvo Germany rebranded Philips Miniwatt SQ "PINCHED WAIST" NOS 1961 (6BL8 substitute)
(!) E80CF Valvo Germany rebranded Philips Miniwatt SQ "PINCHED WAIST" NOS 1962 (6BL8 substitute)
(READ REVIEW) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (11.5/9.6ma and 12.2/9.5ma) (best sound)
7643 Valvo branded Amperex PQ Germany "PINCHED WAIST" NOS 1960 (6BL8 sub)
E80CF=7643 Philips Miniwatt SQ Germany "PINCHED WAIST" used/good 1961 (11.4/10.4mA) (6BL8 sub)
E80CF=7643 Valvo Germany branded Philips 1970 (11.4/9.0ma)
