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(!!!!!) (Best Overall Pair) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (13/9.0ma and 12.8/8.8ma) (1-2% matched) (best sound)
(!!!!!) (Best Overall Single #1) ECF80=6BL8 Telefunken Germany NOS 1971 (14.0/11.5ma) (Highest mA and Gm)
(!!!!!) (Best Pair #2) ECF80=6BL8 Telefunken Germany <> bottom NOS 1960-1963 (13.6/7.5ma and 12.4/8ma) (best sound)
(!!!!) (Best Single #2) 12BH7A RCA NOS 1963 (10.6/11.6ma)
(!!!!) (Best Single) 12BH7A Tungsol black plates "O" getter halo 1960 era (13.2/13.5ma)
(!!!!) (Best Value Pair #1) 12AX7A RCA gray ribbed plates NOS 1967-1973 (best tone) (0.9/0.9ma and 0.9/1.1ma) (Fender)
(!!!!) (Good Value Pair) 12BH7A RCA gray plates NOS 1966-1971 (8.8/12ma and 12.8/8.2ma) (Art Audio, Manley Mac, VTL)
(!!!!) (Recommended Pair) 12BH7A GE branded Zenith and Daystrom gray oval plates "O" getter NOS 1960's (11.0/11.3ma and 10.3/10.5ma)
(!!!!) (Single 1950's) 12BH7A RCA branded Westinghouse narrow black plates NOS "U" getter mid-1950's (10.6/7.4ma) (1st series made)
(!!!!) (Single) 12BH7 Tungsol branded Shield gray oval plates "U" getter halo NOS 1961 (11.8/16.5ma) (Highest mA and Gm)
(!!!!) (Single) 12BH7A GE gray oval plates NOS mid-1960's (11.5/16ma)
(!!!!) (Single) 12BH7A Westinghouse black plates "D" getter NOS 1961 (6.2/7.0ma)
(!!!) (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 Value #2) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1973 (1.0/0.9mA and Gm=1400/1550)
(!!!) (Best Value) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1965 (1.0/0.8mA and Gm=1600/1400)
(!!!) (Good Value Pair) 12BH7A RCA used/very good 1960's (8.0/9.2ma and 9.0/9.7ma) (close Gm)
(!!!) (Recommended Pair) 12AZ7A GE Admiral black plates NOS 1960 (10/9ma and 9.2/10.5ma) (McIntosh MC275)
(!!!) (Recommended Pair) 12AZ7A GE gray plates NOS 1969-1970 (8.2/8.0ma and 8.7/8.8ma) (McIntosh MC275)
(!!!) (Recommended Pair) 12AZ7A Sylvania black plates NOS 1960's same build (8.2/9.8ma and 8.4/9.8ma))
