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(!!!!) (Best Pair #2) E80CC=6085 Philips Holland 1963-1972 (6.1/6.8ma and 6.2/7.1ma) (Highest mA and Gm)
(!!!!) (Best Pair #2) EC92=6AB4 Siemens Halske NOS branded Philips 1967 (9ma and 9ma)
(!!!!) (Best Pair #2) JAN-5755 Raytheon Black Plates NOS 1973 (1.6/1.7ma and 1.7/1.8ma) (High Gm)
(!!!!) (Best Pair #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (84ma/104ma and 91ma/95ma) (close Gm balance)
(!!!!) (Best Pair #2) JAN-6528A Cetron USA test like new 1987-1989 (102/110mA and 104/106.5ma)
(!!!!) (Best Pair #3) 5670W GE NOS 1986 (7.8/8.8ma and 7.6/8.2ma) 1-5% matched
(!!!!) (Best Pair #3) 5763 Sylvania JAN NOS 1974 (33ma and 34ma)
(!!!!) (Best Pair #3) 6201=12AT7=E81CC Philips SQ by Mullard UK gold pins NOS 1974 (10.2/8.8ma and 10.6/9.2ma) (closely matched)
(!!!!) (BEST Pair #3) 6CW4 GE NOS 1974-1978 (105/60 and 107/60) (strong emission)
(!!!!) (Best Pair #3) JAN-5842WA Raytheon NOS 1984-1985 (20.6ma and 20.8ma) 1-3% matched
(!!!!) (Best Pair #4) 6AC7 GE NOS 1979-1982 (8ma/7.8ma)
(!!!!) (Best Pair #4) E80CC=6085 Philips Holland branded RTC NOS 1971-1972 (5.6/7.0ma and 5.8/7.3ma)
(!!!!) (Best Pair 1930's) 30 Sylvania engraved base NOS 1930's (3.2ma and 3.4ma) (same Gm)
(!!!!) (Best Pair 1960) 12AX7 GE tall gray ribbed plates "U" getter like new 1960 (1.2/1.2ma and 1.3/1.2ma) 1-3% matched
(!!!!) (Best Pair 1963) 5U4GB GE NOS 1963 same date codes (60-62/40 and 60-60/40 x 2 tubes)
(!!!!) (Best Pair 1966) CV378=GZ37 Mullard NOS 1966 (52-52/40 x 2 tubes) 1% matched
(!!!!) (Best Pair 6L6GB) 6L6GB RCA and RCA branded Tungsol black plate double "D" getters low hours/like new 1950's (78.5ma and 80ma) (rare)
(!!!!) (Best Pair) 12AU7 Philips Holland NOS 1971-1972 dimpled disc halo (10.2/10.6ma and 11.2/11.6ma)
(!!!!) (Best Pair) 1L6 Sylvania NOS 1950 same date codes (20/16 and 19/16)
(!!!!) (BEST PAIR) 408A Western Electric NOS "D" getter 1970 (85/60 and 86/60)
