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(!!!!!) (BEST PAIR #1) 12AU7=ECC82 Telefunken Germany smooth plates NOS 1968 fair printing (9.0/9.8ma and 10/8.8ma) (Same Gm) 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 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)
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma) (strong Gm)
(!!!!) (Best Value Single) 12AX7 Telefunken Germany smooth plates low hours/tests like new 1965 some stains on glass (Gm=1600/1700 and 1.2/1.3ma)
(!!!!) (Best Value Single) ECC82=12AU7 Telefunken Germany <> Bottom ribbed plates NOS 1969 faded printing (10.8/10.0ma) (Highest Gm)
(!!!!) (Best Value Single) ECC83=12AX7 Telefunken Germany <> bottom ribbed plates branded GAP/R Computor tube used/good 1956 (Gm=1400/1500 and 0.8/0.9ma) 1-5% section balance
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 very good printing (10.0/10.8ma) (high Gm)
(!!!) (Best Value Single) 12AX7=ECC83 Telefunken Germany <> bottom smooth plates used/good 1966 (Gm=1600/1400) (1.0/0.8ma)
(!!) (Best Value) ECC83=12AX7 Telefunken Germany <> bottom smooth plates used/tests like new 1960's faded printing (Gm=2000/1700 and 2.0/1.3ma)
