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(!!!!) (Recommended Single) 12AX7 RCA Motorola black plates "D" getter tests like new 1953 (1.1/1.3ma and Gm=1600/1700)
(!!!!) (Single) 12AX7 RCA Motorola black plates "D" getter used/good 1953 (0.8/0.8ma and Gm=1400/1400) 1% section balance
(!!!!!) (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
(!!!) (7025 Black Plates) 7025=12AX7 RCA long ribbed black plates "D" getter used/good 1958 good printing (Gm=1500/1400) (rare)
(!!!) (Best Single - black plates) 12AX7 RCA Bell and Howell long ribbed black plates "D" getter used/tests like new 1950's faded printing (Gm=1700/1700) 1% section balance
(!!!!!) (Best Mullard 1969) 12AX7=ECC83 IEC Mullard UK NOS 1969 (1.1/1.4ma)
(!) 12AX7A Amperex by RFT East Germany NOS 1970's (Gm=1300/1400)
(!!!!) (Best Single 1966) 12AX7=ECC83 Philips Holland NOS 1966 (2.1/1.9ma and Gm=2100/2100) (Highest mA and Gm)
(!!!!!) (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 Single 1960) 12AX7 Amperex Bugle Boy Holland like new 1960 (Gm=1700/1800 and 1.1/1.3ma) 1-5% section balance
(!!!!!) (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)
