(!!!!!) (2nd Best Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.3/1.4ma) (f91 series)
(!!!!!) (Best Mullard Pair) 12AX7=ECC83 Mullard UK ribbed plates NOS 1970-1974 (1.2/1.3ma and 1.2/1.1ma) (same Gm)
(!!!!!) (Best Overall Single 1957) 12AX7=ECC83 Mullard UK "long plates" NOS 1957 (1.3/1.3ma) 1% section balance (mC1 series)
(!!!!!) (Best Overall Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.2/1.2ma) 1% section balance
(!!!!) (Best Holland Single) 12AX7A=ECC83 Amperex Globe Logo Holland ribbed plates NOS 1970 (1.4/1.4ma and Gm=1700/1800) 1-2% section balance
(!!!!) (Best RCA 1955) 12AX7 RCA black plates "D" getter NOS 1955 (Gm=1800/2000 and 1.2/1.5ma) (rare tube)
(!!!!) (Best Single 1961) 12AX7=ECC83 Mullard UK ribbed plates NOS 1961 (161 Series) (1.1/1.1ma and Gm=1600/1700)
(!!!!) (Best Value Pair #1) 12AX7A RCA gray ribbed plates NOS 1967-1973 (best tone) (0.9/0.9ma and 0.9/1.1ma) (Fender)
(!!!!) (Good Value Pair 1960's) 12AX7A RCA gray ribbed plates NOS 1967 (best tone) (1.0/0.8ma and 1.0/0.8ma) (1-2% matched)
(!!!) (Best Single 1966) 12AX7A RCA ribbed plates NOS 1966 (Gm=1800/1600, 1.3/1.0ma) (best tone, 2nd best to Mullard)
(!!!) (Best Single) 12AX7A Sylvania NOS 1960's (Gm=2600/2400)
(!!!) (Best Single) 12AX7A Sylvania NOS 1970's (Gm=2800/2900)
(!!!) (Good Value Single) 12AX7=ECC83 Mullard GE UK ribbed plates used/good 1966 (.8/.9ma and Gm=1450/1600)
(!!!) (Good Value Single) 12AX7A RCA Magnavox ribbed plates used/good 1961 (Gm=1500/1900 and 0.8/1.3ma)
(!!!) (Good Value Single) 12AX7A RCA ribbed plates NOS 1974 (Gm=1600/1400, 1.1/0.8ma)
(!!!) (Good Value Single) 12AX7A RCA ribbed plates used/good 1960's faded printing (Gm=1400/1700 and 0.8/1.1ma)
(!!!) (Good Value) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1973 (1.0/0.9mA and Gm=1400/1550)
(!!!) (Good Value) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1974 (0.8/1.0mA and Gm=1350/1550) (Fender, McIntosh)
(!!!) (Good Value) 12AX7A/7025 GE NOS pinched plates 1976 (0.9/1.7ma and Gm=1500/2000)
(!!!) (Recommended Single) 12AX7A RCA gray ribbed plates NOS 1971 (Gm=1600/1800 and 1.2/1.4ma)
