(!!!!!) (Best Pair 1974) 12AU7 Mullard UK NOS 1974 (10.5/10.7ma and 10.4/11.5ma) (Rogue, Hovland, Audio Note)
(!!!!!) (Best Pair) 5U4GB CBS NOS 1950's double "D" getters (59-59/40 and 58-60/40)
(!!!!!) (Recommended Mullard Pair) 6BQ5=EL84 Mullard UK branded RTC England NOS 1971-1978 (45.5ma and 48.0ma)
(!!!!!) (Recommended Pair) 5881 GE Canada NOS 1966-1967 (65.2ma and 68.5ma) (same build as Tungsol)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (56-58/40 and 57-58/40)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (60-64/40 and 60-66/40)
(!!!!) (2nd Best Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (5.8/6.1ma and 58/62ma)
(!!!!) (Best Audio Pair) PCC88=7DJ8 Philips Holland "A" Frame 1970 (11.5/12.6ma and 11.6/13.6ma) (Similar sound to 6DJ8 Holland)
(!!!!) (Best Overall Pair) 6550 Tungsol gray plates NOS 1975 (139ma and 140.5ma)
(!!!!) (Best Pair) 12AU7=ECC82 Mullard Philips UK ribbed plates NOS 1974 same date codes 1-2% matched (9.8/10.2ma and 9.8/10.0ma) (Rogue, Hovland, Audio Note)
(!!!!) (Best Pair) 12AU7=ECC82 Mullard Philips UK ribbed plates NOS 1974 same date codes 1-2% matched (9.8/9.6ma and 9.6/10.0ma) (Rogue, Hovland, Audio Note)
(!!!!) (Best Pair) 5U4GB RCA NOS 1970-1973 (62-62/40 and 60-60/40)
(!!!!) (Best Pair) 5Y3GT Philips Holland NOS 1960's (59-63/40 and 60-64/40)
(!!!!) (Best Pair) 6550 Tungsol gray plates NOS 1975 (128ma and 129ma)
(!!!!) (Best Pair) 6550 Tungsol gray plates NOS 1975 (130ma and 131ma)
(!!!!) (Best Siemens Pair) 12AT7=ECC81 Siemens Halske Germany branded "SATOR" NOS 1964 (9.0/9.3ma and 9.2/10ma) (close Gm)
(!!!!) (Best Single 1965) ECC82=12AU7 Miniwatt Holland like new 1965 (9.4/9.4ma) 1% section balance
(!!!!) (Best Single) 12AX7WA Sylvania NOS 1970's (Gm=3000/3100 and 2.5/2.5ma)
(!!!!) (Best Value Pair 1965 era) 12AX7=ECC83 Philips Miniwatt Holland like new 1964-1965 era (1.3/1.2ma and 1.1/1.2ma)
(!!!!) (Best Value Single) 12AX7 Hitachi Japan branded ITT NOS 1963 (1.0/1.7ma and Gm=1500/1950)