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(!!!!!) (Best Mullard 1962) 12AX7=ECC83 Mullard UK BVA ribbed plates NOS copper grid posts 1962 (1.1/1.1ma) (same Gm) 1% section balance
(!!!!!) (Best Pair #1) ECC83=12AX7 Mullard UK branded Philips ribbed plates NOS 1964-1969 (163 series) (1.5/1.4ma and 1.3/1.4ma) (sweet sound) (Close Gm)
(!!!!!) (Best Pair #2) ECC83=12AX7 Mullard UK branded Philips ribbed plates NOS 1964 (163 series) (1.0/1.2ma and 1.4/1.1ma) (sweet sound) (Close 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 Mullard UK branded Philips NOS 1967 (163 series) (1.2/1.3ma) (sweet sound) (Same Gm)
(!!!!!) (Best Value Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1964 smeared printing (1.7/1.4ma) (163 series) (Highest mA and Gm)
(!!!!!) (Best Value Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1965 (1.0/0.9ma) (163 series)
(!!!!!) (Best Value Single) ECC83=12AX7 Mullard UK low hours/like new 1967 (163 series) (1.4/1.2ma) (sweet sound)
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma) (strong Gm)
(!!!!) (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 Pair #2) 12AX7A RCA ribbed plates NOS 1965-1968 (1.4/1.0ma and 1.3/1.1ma) (Fender Rogue, McIntosh)
(!!!!) (Best Single) 12AX7 Brimar BVA England narrow tall ribbed plates NOS 1958 large "O" getter halo (1.4/1.4ma and Gm=2000/1600)
(!!!!) (Best Value Pair) 12AX7A RCA gray ribbed plates NOS 1968-1974 (best tone) (0.8/0.9ma and 0.8/1.0ma) (Fender, Rogue, McIntosh, CJ)
(!!!!) (Best Value Single) ECC82=12AU7 Telefunken Germany <> Bottom ribbed plates NOS 1969 faded printing (10.8/10.0ma) (Highest Gm)
(!!!!) (Good Value Pair) 12AX7=ECC83 Philips Holland ribbed plates "O" getter halo used and like new (1.1/1.0ma and 1.1/1.0ma) 1-2% matched
(!!!!) (Read Review) 12AX7A=ECC83 Matsushita Japan NOS rebranded Raytheon NOS 1970 era (Gm=1800/1800 and 1.5/1.3ma) (similar to Mullard)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 very good printing (10.0/10.8ma) (high Gm)
(!!!) (Best Value Single) 12AX7A RCA gray plates used/good 1960's (Gm=1400/1500 and 0.9/0.9ma)
(!!!) (Best Value Single) 12AX7A RCA ribbed plates NOS 1960's faded printing (Gm=1800/1900, 1.2/1.5ma) (Highest mA and Gm)
