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(!!!!!) (Best Value Pair) ECC83=12AX7 Philips Miniwatt Holland used/tests like new 1968-1970 (1.2/1.3ma and 1.4/1.1ma) 1-3% matched
(!!!!) (3rd Best Pair 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 faded printing (1.0/1.0ma and 1.2/0.9ma) 1-5% matched
(!!!!) (Best Pair #1) ECC83=12AX7 BRIMAR EDISWAN VALVE England gray ribbed plates "o" getter NOS 1960's (1.6/1.5ma and 1.5/1.7ma)
(!!!!) (Best Pair #2) ECC83=12AX7 BRIMAR EDISWAN VALVE England gray ribbed plates "o" getter NOS 1960's (1.2/1.2ma and 1.3/1.3ma) 1-5% matched
(!!!!) (Best Pair #2) ECC83=12AX7 BRIMAR EDISWAN VALVE England gray ribbed plates "o" getter NOS 1960's (1.3/1.5ma and 1.8/1.3ma) (close Gm)
(!!!!) (Best Single 1958) 6922 Amperex Holland curved "D" getter 1958 NOS (16.2/17.8ma) (same sonics as pinched waist version)
(!!!!) (Best Single 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 era (Gm=1600/1800 and 1.2/1.5ma)
(!!!!) (Good Value Single 1964) PCC88=7DJ8 Philips Miniwatt Holland "O" getter NOS 1964 (10.5/16.2ma)
(!!!!) (Single) PCC88=7DJ8 Philips Holland "O" getter NOS 1968 (11.8/8.8ma)
(!!!!) (Slightly microphonic) ECC83=12AX7 Amperex Bugle Boy Holland "long plates" and "D" getter tests like new 1958 (1.2/1.3ma and Gm=1700/1700) 1-3% section balance
(!!!) (#1 6BX7GT RCA single) 6BX7GT RCA NOS 1961 (41/48ma)
(!!!) (BEST 6X4 MULLARD) CV493=EZ90=6X4 Mullard UK NOS D getter 1955 in white box (60/40 and 60/40) 1% section balance
(!!!) (BEST HOLLAND) EZ90=6X4 Philips Holland low hours "D" getter 1958 (50/40 and 50/40) 1% section balance
(!!!) (Best Pair #3) 407A Western Electric NOS "O" getter 1972-1983 (40-40/26 and 42-43/26)
(!!!) (Best Pair from 1959) EL84 Wien Austria same build and sound as Holland 1959 (38ma and 39ma)
(!!!) (Best Pair) 6BL7GTA GE black plates NOS 1958 and 1966 (43.0/44.5ma and 40.5/41.5ma) (very close Gm matching)
(!!!) (Best SIngle 1950's) 12AT7 Brimar UK black plates "O" getter halo NOS late 1950's (11.6/12.8ma)
(!!!) (Best Single 1953) JG-5814 GE NOS "square getter halo" and "short wide ribbed dark black plates" 1953 in white box (11.0/12.5ma)
(!!!) (Best Single) 12AU7A Tungsol tall ribbed plates NOS "O" getter halo 1960 era (10.8/11.4ma)
(!!!) (Best Single) 2C51=5670 Sylvania NOS 1970's (8.8/8.4ma)
