(!!!!!) (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)
(!!!!!) (Best Value) 5U4G RCA used/tests like new "D" getter 1955 guide pin reglued on base (57/40 and 61/40)
(!!!!!) (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 (9.8/9.6ma 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 RCA Single) 6L6GC Seeburg by RCA black plate tests like new 1965 (69ma)
(!!!!) (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 Single) 5U4G RCA used/tests like new "D" getter 1955 (56/40 and 56/40) 1% section balance