(!!!!!) (BEST HOLLAND PAIR 1961-1963) 12AX7=ECC83 Philips Miniwatt Holland NOS 1961-1963 (1.2/1.3ma and 1.3/1.3ma) 1-3% matched
(!!!!!) (Best Holland Pair) 12AX7=ECC83 Philips Miniwatt Holland NOS "O" getter halo 1962-1965 (1.4/1.6ma and 1.4/1.5ma) (Highest mA and Gm) 1-2% matched
(!!!!!) (Best Holland Pair) 12AX7=ECC83 Philips Miniwatt Holland NOS 1963 (1.0/1.1ma and 1.0/1.1ma) 1% matched
(!!!!!) (Best Overall Pair) 12AX7=ECC83 Telefunken Germany <> bottom ribbed plates NOS and like new 1959 same date codes (1.1/1.1ma and 1.1/1.1ma) (phono grade) 1-2% matched
(!!!!!) (Best Overall Single) 12AX7 Telefunken Germany ribbed plates NOS 1960 (1.4/1.7ma and Gm=1800/1900)
(!!!!!) (Best Overall Single) 12AX7 Telefunken Germany ribbed plates NOS 1962 (1.2/1.4ma and Gm=1700/1800)
(!!!!!) (Best Overall Telefunken Pair) 12AX7=ECC83 Telefunken <> bottom smooth plates low hours/like new 1964 (Gm=1600/1800 and 1600/1700) (1.1/1.4ma and 1.0/1.2ma)
(!!!!!) (Best Raytheon Black Plate Pair) JRP-12AX7 Raytheon tall-ribbed "Black Plates" NOS 1962 (1.0/1.2ma and 1.0/1.2ma) 1-2% matched
(!!!!!) (Best Siemens Pair) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-3% matched (1.0/1.2ma and 1.0/1.0ma)
(!!!!!) (Best Single) 12AX7=ECC83 IEC Mullard UK NOS 1969 (1.2/1.4ma and Gm=1700/1900)
(!!!!!) (Best Tungsram Pair) ECC83=12AX7 Tungsram Hungary NOS 1980 (1.2/1.5ma and 1.2/1.6ma) 1-2% matched
(!!!!!) (Best Tungsram Pair) ECC83=12AX7 Tungsram Hungary NOS 1980 (1.4/1.6ma and 1.4/1.6ma) 1-3% matched
(!!!!!) (Best Tungsram Quad) ECC83=12AX7 Tungsram Hungary NOS 1980 (1.4/1.6ma x 4 tubes) 1-2% matched quad
(!!!!!) (Best Tungsram Quad) ECC83=12AX7 Tungsram Hungary NOS 1980 (1.5/1.7ma x 4 tubes) 1-3% matched quad
(!!!!!) (Best Tungsram Quad) ECC83=12AX7 Tungsram Hungary NOS 1980 1-3% matched
(!!!!!) (Best Value Pair) 12AX7=ECC83 Telefunken Germany <> bottom smooth plates like new 1960-1962 era (1.0/1.1ma and 1.1/1.1ma) 1-3% matched
(!!!!!) (Best Value Single) 12AX7 IEC Mullard UK NOS 1965 copper grid posts (0.7/1.2ma and Gm=1400/1700)
(!!!!!) (Best Value Single) 12AX7 Mullard branded "M" UK used/good 1961 copper grid posts (0.7/.8ma and Gm=1400/1500) (161 series)
(!!!!!) (Recommended Pair) ECC83=12AX7 Hammond Holland low hours/test like new 1963 and 1966 (1.1/1.3ma and 1.1/1.3ma) closely matched
(!!!!!) (Recommended RCA Single) 12AX7A RCA CMI gray ribbed plates NOS 1968 faded printing (Gm=1600/1700 and 1.0/1.4ma) (CMI=Chicago Musical Instrument Co.)
