(!!!!!) (Best Overall Pair) ECC33=6SN7GT Mullard UK black plates NOS pan shape getter halo 1950-1955 era (9.4/8.6ma and 9.4/8.4ma) 1-2% matched (best sounding ECC33 of all-time)
(!!!!!) (Best Overall Pair) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (best sound)
(!!!!!) (Best Overall Single 1957) 12AX7=ECC83 Mullard UK "long plates" NOS 1957 (1.3/1.3ma) 1% section balance (mC1 series)
(!!!!!) (Best Overall Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.2/1.2ma) 1% section balance
(!!!!!) (Best Overall Single) ECC82=12AU7 Telefunken Diamond Bottom <> smooth plates NOS 1965 (10.2/10.2ma) 1-2% section balance
(!!!!!) (Best Overall Single) ECC82=12AU7 Telefunken Diamond Bottom <> smooth plates NOS 1970 (14.4/14.2ma) (Highest mA and Gm)
(!!!!!) (Best Overall Single) ECC83=12AX7 Telefunken Germany smooth plates NOS 1965 (1.3/1.5ma and Gm=1800/2000) (Highest mA and Gm)
(!!!!!) (Best Overall Single) JAN-5691 Sylvania black plates NOS 1977 (2.8/3.1mA) (Same Gm) (Best 6SL7GT sub) (same internals as 5691 red base)
(!!!!!) (BEST PAIR #1) 417A Western Electric NOS 1980 (42.5ma and 43ma)
(!!!!!) (Best Pair 1959) 6DJ8=ECC88 Philips Miniwatt Holland large "O" getter halo NOS 1959 etched section on each tube (18.6/15.4ma and 16.4/15.8ma)
(!!!!!) (Best Pair 1960's) 12AU7 Mullard UK NOS 1965-1966 same build (10.2/12.4ma and 10.6/12.0ma) (Rogue, Hovland, Audio Note)
(!!!!!) (Best Pair 1960) 5814A GE "5 STAR" triple mica "O" getter halo 1960 (10.4/10.6ma and 10.6/10.8ma) (best 12AU7 SUB) 1-2% matched
(!!!!!) (Best Pair) 5814A Philips JAN USA by Sylvania NOS 1985 (10/11ma and 9.5/10.5ma) 1-3% matched (same Gm)
(!!!!!) (Best Pair) 6189W Sylvania NOS 1981 (9/10.2ma and 10/9ma) 1-3% matched (same Gm)
(!!!!!) (Best Pair) 6DJ8=ECC88 Philips Miniwatt Holland "o" getter halo NOS 1963-1964 (19.6/18.0ma and 17.0/20.0ma)
(!!!!!) (Best Pair) 6DJ8=ECC88 Philips Miniwatt Holland "o" getter halo NOS 1963-1964 (20.2/19.2ma and 22.2/20.0ma)
(!!!!!) (Best Pair) 6EM7 Sylvania coin-base NOS 1970's (2.2ma/60ma and 2.0ma/61ma)
(!!!!!) (Best Pair) 6SN7GT Tungsol parallel gray plates 1954 (8.7/7.5ma and 8.0/7.5ma) (very close Gm) (Cary, Rogue)
(!!!!!) (Best Pair) ECC803S=12AX7 Telefunken Ulm Germany <> bottom NOS 1961 (1.4/1.45ma and 1.5/1.6ma) 1-2% matched (Nagra, Lamm, VTL, Aesthetix, Diva)
(!!!!!) (Best Pair) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (best sound)
