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(!!!!!) (Best Mullard Pair #1) 12AX7=ECC83 Mullard UK ribbed plates NOS 1966 same date codes (1.4/1.1ma and 1.3/1.2ma) 1-2% matched
(!!!!!) (Best Mullard Pair #2) 12AX7=ECC83 Mullard UK ribbed plates NOS 1969 same date codes (1.4/1.1ma and 1.3/1.2ma) 1-5% matched
(!!!!!) (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) 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 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 1966) ECC83=12AX7 Mullard UK ribbed plates NOS 1966 (163 series) (1.3/1.1ma) (same Gm) (sweet sound)
(!!!!!) (Best Single 1967) ECC83=12AX7 Mullard UK ribbed plates NOS 1967 (163 series) (1.4/1.2ma) (same Gm) (sweet sound)
(!!!!!) (Best Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1965 (1.0/0.9ma) (163 series)
(!!!!!) (Mullard 1969) 12AX7=ECC83 Mullard UK ribbed plates NOS 1969 (1.1/1.2ma) (same Gm)
(!!!!!) (Recommended Single) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=1700/1900) (1.0/1.4ma)
(!!!!!) (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 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 Single #1) 12AX7=ECC83 Philips Miniwatt Holland ribbed plates NOS 1965 (1.4/1.3ma and Gm=1900/1900) 1-2% section balance
(!!!!) (Best Single 1955 era) CV492=12AX7 BRIMAR BVA England NOS black ribbed plates "D" getter 1955 era (1.0/0.9ma) (rare)
(!!!!) (Best Single 1956) 12AX7 GE Motorola tall gray ribbed plates "U" getter 1956 like new (Gm=1700/2000 and 1.6/2.1ma)
(!!!!) (Best Single 1960) 12AX7 GE tall gray ribbed plates "U" getter NOS 1960 (Gm=1700/1600 and 1.5/1.1ma)
(!!!!) (Best Single 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 era (Gm=1600/1800 and 1.2/1.5ma)
(!!!!) (Best Single 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 era (Gm=1700/1800 and 1.3/1.4ma)
