(!!!!!) (Best Overall Pair) CV4004=12AX7 Mullard box plates NOS 1981 (1.0/1.1ma and 1.1/1.1ma) 1% matched
(!!!!!) (Best Overall Single) 12AX7 Telefunken Germany ribbed plates NOS 1962 (1.2/1.4ma and Gm=1700/1800)
(!!!!!) (Best Overall Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1700/1700) (1.2/1.2ma) 1% section balance
(!!!!!) (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 Pair) 12AX7=ECC83 GE NOS 1969 (1.0/1.0ma and 1.0/1.1ma) (Matchless, Fender, Tow-Rock, Dumble, VOX, Supro)
(!!!!!) (Best RCA Pair 1968) 12AX7A RCA CMI gray ribbed plates NOS 1968 same date codes (best tone) (1.0/1.0ma and 1.0/1.0ma) 1% matched
(!!!!!) (Best Siemens Pair) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-3% matched (1.0/1.2ma and 1.0/1.0ma)
(!!!!!) (Best Siemens Single) ECC83=12AX7 Siemens Halske Germany NOS 1967 faded printing (1.1/1.1ma) (Gm=1700/1700) 1% section balance
(!!!!!) (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 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 Mullard Pair) 12AX7=12AX7A=ECC83 Mullard England branded GE ribbed plates NOS 1966 and 1969 (163 Series) (1.1/1.2ma and 1.2/1.3ma)
(!!!!!) (Recommended Mullard Pair) 12AX7=ECC83 IEC Mullard England ribbed plates NOS 1966 (163 Series) (1.1/1.2ma and 1.2/1.4ma)
(!!!!!) (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 (Gm=1500/1550 and 0.9/1.0ma)
(!!!!!) (Recommended RCA Single) 12AX7A RCA CMI gray ribbed plates NOS 1968 (Gm=1500/1600 and 0.9/1.1ma)
