(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=2100/2300 and 1.7/1.9ma)
(!!!!) (Good Value Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1300/1600) (0.7/1.1ma)
(!!!) (Best Single) 12AX7A Sylvania NOS 1960's (Gm=2600/2400)
(!!!!) (Recommended Single) 12AX7 Brimar BVA England narrow ribbed plates used/good 1959 (1.1/1.0ma and Gm=1450/1350)
(!!!) (Recommended Single) 12AX7A RCA gray ribbed plates NOS 1971 (Gm=1600/1800 and 1.2/1.4ma)
(!!!!!) (Recommended Single) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966 (Gm=1500/1400 and 1.0/0.8mA)
(!!!) (Recommended Single) 12AX7A Sylvania NOS 1970's (Gm=2600/3000)
(!!!!!) (Best Holland Pair) 12AX7=ECC83 Philips Miniwatt Holland like new "O" getter halo 1961 (1.4/1.6ma and 1.4/1.5ma) (Highest mA and Gm) 1-2% matched
7729=12AX7 Raytheon Uniline Gold Pins (sold out)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1450 and 0.7/0.8mA)
(!!!!) (Recommended Single) ECC803S=12AX7 Telefunken Ulm Germany <> bottom gold pins NOS 1961 (1.3/1.5ma and Gm=1600/1800)
(!) (Good Value) ECC83=12AX7 Siemens Halske Germany used/good 1960's in white box (Gm=1500/1700)
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=1600/1700 and
(!!!!!) (2nd Best Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.3/1.4ma) (f91 series)
(!!!!) (Good Value Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1500/1700) (0.9/1.2ma)
(!!!!) (Good Value Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1300/1500) (0.7/1.0ma)
(!!!!) (Best Value Single) ECC83=12AX7 Tungsram Hungary NOS 1980 (Gm=1500/1600) (0.9/1.0ma)
(!!!!) (Best Value Single) ECC83=12AX7 Tungsram Hungary NOS 1980 (Gm=1500/1800) (0.9/1.2ma)
(!!!!!) (Best Tungsram Single) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=2000/2300) (1.7/1.8ma) (Highest mA and Gm)
(!!!!!) (Recommended Single) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=1700/1900) (1.0/1.4ma)
