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(!!!!!) (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 1967) 12AX7=ECC83 Telefunken Germany <> bottom smooth plates NOS 1967 partially faded printing (1.2/1.5ma and Gm=1600/1800) (EAR, Manley, AKG)
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma) (strong Gm)
(!!!!!) (Recommended Single) ECC83=12AX7 Telefunken Germany <> bottom smooth plates NOS 1969 (1.1/1.0ma and Gm=1700/1600) 1-3% section balance
(!!!!) (Best Single) ECC83=12AX7 Telefunken Germany <> bottom smooth plates 1967 (1.6/1.6ma and Gm=1900/1800) (Highest mA and Gm)
(!!!!) (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)
