(!!!!!!) (Best Tungsram Pair) ECC83=12AX7 Tungsram Hungary NOS 1980 (1.3/1.7ma and 1.3/1.6ma) 1-3% matched
(!!!!!) (Best Overall Single) 12AX7A Amperex Bugle Boy Holland like new 1965 (1.4/1.4mA and Gm=1800/1800) 1% section balance
(!!!!!) (Best RCA Pair 1968) 12AX7A RCA CMI gray ribbed plates NOS 1968 same date codes (best tone) (1.0/1.2ma and 1.0/1.3ma) 1-2% matched
(!!!!!) (Best Single 1966) 12AX7 Mullard UK red tip mil-grade NOS 1966 (0.9/1.2ma and Gm=1500/1700) (163 series) (Fender, Marshall, Gibson)
(!!!!!) (Best Single) 12AX7 Amperex Bugle Boy Holland like new 1965 (1.3/1.7mA and Gm=1800/1900) (red tip mil-grade) (Highest Gm)
(!!!!!) (Best Single) 12AX7 Amperex Bugle Boy Holland like new 1966 (1.2/1.2mA and Gm=1700/1700) 1% section balance
(!!!!!) (Best Single) 12AX7A Amperex Bugle Boy Holland like new 1966 (1.3/1.4mA and Gm=1700/1800) 1-3% section balance
(!!!!!) (Best Tungsram Pair) ECC83=12AX7 Tungsram Hungary NOS 1969 (1.1/1.2ma and 1.0/1.3ma) 1-3% matched
(!!!!!) (Best Tungsram Pair) ECC83=12AX7 Tungsram Hungary NOS 1980 (1.4/1.6ma and 1.4/1.6ma) 1-2% matched
(!!!!!) (Best Value Single) 12AX7 IEC Mullard UK NOS 1965 copper grid posts (0.7/1.2ma and Gm=1400/1700)
(!!!!!) (Recommended Brimar Single) 6057=12AX7 Brimar Thorn "T" England NOS 1960's (Gm=1550/1650) (1.0/1.2ma)
(!!!!!) (Recommended Pair) 12AX7=ECC83 Mullard BVA UK ribbed plates NOS 1969 in white boxes (1.0/1.1ma and 1.0/1.0ma) 1-3% matched
(!!!!!) (Recommended Pair) 12AX7=ECC83 Mullard BVA UK ribbed plates NOS 1969 in white boxes (1.0/1.3ma and 1.1/1.2ma) 1-3% matched
(!!!!!) (Recommended Single) 12AX7 Mullard UK red tip mil-grade used/good 1965 copper grid posts (0.8/1.1ma and Gm=1400/1800) (163 series) (Fender, Marshall, Gibson)
(!!!!!) (Recommended Single) 12AX7 Telefunken Germany ribbed plates low hours/like new 1957 (1.0/1.0ma and Gm=1550/1550) 1% section balance
(!!!!!) (Recommended Single) 12AX7A Mullard UK branded KNIGHT used/good 1962 (0.8/0.9mA and Gm=1500/1600)
(!!!!!) (Recommended Tungsram Pair) ECC83=12AX7 Tungsram Hungary NOS 1980 (1.2/1.3ma x 2 tubes) 1% matched
(!!!!!) (slightly microphonic) 12AX7A RCA gray ribbed plates NOS 1970 era (1.1/2.3ma)
(!!!!) (Best GE Single) 12AX7A GE NOS 1967 (Gm=1550/1700) (1.2/1.4ma)
(!!!!) (Best Single) 12AX7 Raytheon Black Plates NOS 1962 faded printing (1.1/1.3ma and Gm=1500/1700)
