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(!!!!!) (Best Mullard 1969) 12AX7=ECC83 IEC Mullard UK NOS 1969 (1.1/1.4ma)
(!!!!!) (Best Overall Pair) 12AX7=ECC83 Philips Holland NOS 1966 same date codes (1.6/1.7ma and 1.5/1.5ma) 1-3% matched (Highest Ma and Gm)
(!!!!!) (Best Overall Pair) ECC83=12AX7 Telefunken Germany smooth plates NOS 1965-1967 (1.3/1.1ma and 1.3/1.1ma) (phono grade) 1% matched (Same Gm)
(!!!!!) (Best Pair #2) 12AX7=ECC83 Philips Holland NOS 1966 and 1971 (1.8/1.7ma and 1.6/1.8ma) (Highest mA and Gm)
(!!!!!) (Best Pair #2) ECC83=12AX7 Telefunken Germany <> smooth plates NOS 1966 (1.0/1.0ma and 1.0/1.0ma) (phono grade) 1% matched (same Gm matching)
(!!!!!) (Best Pair #2) ECC83=12AX7 Telefunken Germany <> smooth plates NOS 1966 (1.0/1.2ma and 1.0/1.3ma) (phono grade) 1-3% matched (very close Gm matching)
(!!!!!) (Best Pair) 12AX7=ECC83 Pope and Philips Holland NOS 1971-1972 (1.1/1.6ma and 1.2/1.7ma) (Same Gm)
(!!!!!) (Best Pair/Best Price) 12AX7=ECC83 Philips Holland NOS 1966 (1.0/1.1ma and 1.0/1.2ma) 1-3% matched
(!!!!!) (Best Pair/Best Price) 12AX7=ECC83 Philips Holland NOS 1966 same date codes (1.1/1.3ma and 1.1/1.3ma) 1-2% matched
(!!!!!) (Best Value Single) 12AX7 Amperex Bugle Boy Holland red-tip used/good 1966 (0.8/1.6mA and Gm=1400/1800) (red tip mil-grade)
(!!!!!) (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) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=1700/1900) (1.0/1.4ma)
(!!!!!) (Recommended Single) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966 (Gm=1500/1400 and 1.0/0.8mA)
(!!!!) (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) ECC83=12AX7 Tungsram Hungary branded IEC Mullard NOS 1982 (1.5/1.6ma and 1.4/1.7ma)
(!!!!) (Best Overall Single) CV4004=12AX7 Mullard box plates NOS 1971-1972 (Gm=1600/1700) (1.3/1.5ma)
(!!!!) (Best Overall Single) ECC803S=12AX7 Telefunken Ulm Germany <> bottom NOS 1967 (1.5/1.5ma and Gm=1800/1800) 1% section balance
(!!!!) (Best Overall Single) M8137=Cv4004=12AX7 Mullard box plates branded Philips NOS 1966 (Gm=1600/1700) (1.3/1.3ma) 1-2% section balance
(!!!!) (Best Pair #1) 12AX7 GE branded 12AX7A International NOS 1977 (1.3/1.3mA and 1.4/1.4ma) (Same Gm) 1-2% matched
