(!!!!!) (BEST PHONO PAIR) ECC83=12AX7 Siemens Halske Germany branded SONOTONE NOS 1962 (1.5/1.5ma and 1.4/1.5ma) 1-2% matched (Aesthetix, EAR, Lamm, VTL, Jadis, Nagra)
(!!!!!) (Recommended Single) 12AX7 BRIMAR BVA England NOS narrow ribbed plates NOS 1960 (1.4/1.5ma) (Highest mA and Gm)
(!!!!) (Best Single) 12AX7 Telefunken Germany smooth plates branded DYNACO like new 1965 (Gm=1600/1800)
(!!!!) (Best Single) 12AX7A Sylvania NOS 1960's (Gm=2600/3100 and 1.8ma/2.4ma)
(!!!!) (Best Tungsram Single) ECC83=12AX7 Tungsram Hungary NOS 1980 (Gm=1600/1700) (1.1/1.3ma)
(!!!!!) (Best Tungsram Single) ECC83=12AX7 Tungsram Hungary NOS 1980 (Gm=1900/1900) (1.2/1.5ma)
(!!!!) (Best Value Single) 12AX7 Hitachi Japan branded ITT NOS 1963 (1.0/1.7ma and Gm=1500/1950)
(!!!!) (Best Value Single) 12AX7 Raytheon Black Plates NOS 1962 (.9/1.1ma and Gm=1400/1600)
(!!!!) (Best Value Single) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (0.8/1.0ma and Gm=1500/1650)
(!!!!) (Best Value Pair) 12AX7=ECC83 Telefunken Germany <> bottom ribbed plates used/test like new 1960 era (1.2/1.2ma and 1.4/1.0ma) (close Gm)
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 (.8/1.2mA Gm=1400/1600)
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 copper grid posts (.7/.8mA Gm=1400/1500)
(!!!!) (Best Overall Single) M8137=Cv4004=12AX7 Mullard box plates NOS 1967 (Gm=1700/1700) (1.5/1.6ma)
(!!!!) (Recommended Single) 12AX7=ECC83 Philips Holland like new 1964 (Gm=1550/1600 and 1.1/1.2ma) 1-3% section balance
(!!!!) (Recommended Single) 12AX7=ECC83 Mullard England branded Philips ribbed plates NOS 1974 (163 Series) (1.0/1.1ma and Gm=1500/1700)
(!!!!) (Recommended Single) 12AX7=ECC83 Mullard UK made for Knight like new ribbed plates 1963 (161 series) (1.0/1.0ma and Gm=1550/1600)
(!!!!) (Slightly microphonic single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1962 (161 Series) (1.0/1.2ma and Gm=1600/1650)
(!!!!) (2nd Best Siemens Single) ECC83=12AX7 Siemens Halske NOS 1966 (1.0/1.1ma) (Gm=1550/1600)
(!!!) (Best Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1600/1650) (1.1/1.1ma)
(!!!) (Best Value Single) 12AX7=ECC83 FISHER HOLLAND large "O" getter halo 1960 used/good (Gm=1550/1600 and .9/1.0ma)
