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(!!!!!) (Best Pair #2) 12AX7=ECC83 Philips Miniwatt Holland NOS and like new 1965-1966 (1.3/1.5ma and 1.4/1.3ma) 1-3% matched
(!!!!!) (Best Pair) 12AX7=ECC83 Philips Miniwatt Holland NOS 1966 (1.5/1.4ma and 1.4/1.4ma) 1-3% matched (Highest Ma and Gm)
(!!!!!) (Best Single #3) ECC83=12AX7 Telefunken Germany ribbed plates used/tests like new 1953-1955 (1.3/1.1ma and Gm=1700/1600) 1-5% section balance
(!!!!!) (Best Single 1959) ECC83=12AX7 Telefunken Germany <> bottom ribbed plates NOS 1959 (1.1/1.0ma and Gm=1700/1600) 1-3% section balance
(!!!!!) (Best Single) ECC83=12AX7 Telefunken Germany <> bottom smooth plates NOS 1969 (1.3/1.1ma and Gm=1800/1600)
(!!!!!) (Best Value Pair) 12AX7=ECC83 Philips Miniwatt Holland used/strong 1962-1966 (1.3/1.2ma and 1.1/1.2ma) 1-3% matched
(!!!!!) (Best Value Pair) ECC83=12AX7 Philips Miniwatt Holland used/tests like new 1968-1970 (1.2/1.3ma and 1.4/1.1ma) 1-3% matched
(!!!!!) (Best Value Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1965 (1.0/0.9ma) (163 series)
(!!!!!) (Recommended Single) CV4035=M8214=12AX7 Brimar England NOS flying leads 1960's (solder leads into ckt)
(!!!!!) (Recommended Single) CV4035=M8214=12AX7 Mullard England box plates NOS flying leads 1961 (solder leads into ckt)
(!!!!!) (Recommended Single) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966 (Gm=1500/1400 and 1.0/0.8mA)
(!!!!!) (Slightly Microphinic Single 1962) 12AX7A Mullard UK branded KNIGHT NOS 1962 (1.3/1.1mA and Gm=1800/1800)
(!!!!) (3rd Best Pair 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 faded printing (1.0/1.0ma and 1.2/0.9ma) 1-5% matched
(!!!!) (Best Overall Pair) 12AX7A RCA gray ribbed plates NOS 1974 same date codes (best tone) (1.3/1.2ma and 1.3/1.1ma) (Fender, McIntosh, Rogue Audio
(!!!!) (Best Overall Single) CV4004=12AX7 Mullard box plates NOS 1971-1972 (Gm=1600/1700) (1.3/1.5ma)
(!!!!) (Best Overall Single) CV4004=12AX7 Mullard box plates NOS 1981 (1.4/1.4ma and Gm=1800/1800) 1% section balance
(!!!!) (Best Pair #1) 12AX7A Sylvania NOS 1970's (2.3/2.0ma and 2.1/2.3ma)
(!!!!) (Best Pair #2) 12AX7A RCA ribbed plates NOS 1965-1968 (1.4/1.0ma and 1.3/1.1ma) (Fender Rogue, McIntosh)
(!!!!) (Best Pair 1960) 12AX7 GE tall gray ribbed plates "U" getter like new 1960 (1.2/1.2ma and 1.3/1.2ma) 1-3% matched
(!!!!) (Best Pair) CV4004=12AX7 Mullard box plates NOS 1981 (0.9/1.2ma and 0.9/1.1ma)
