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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 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
(!!!) (Single) 7199 RCA Black Plates NOS 1964 (10.2ma pentode, 12ma triode)
(!!!) (Single) 7199 RCA Black Plates NOS 1970 era (10.6/8.6ma)
(!!) (2nd Best Pair) 7199 Sylvania NOS 1960's and 1985 same build (12.5ma/9.6ma and 12.3/10.2ma) 1-3% matched
(!!) (Best Value Single) 7199 Sylvania branded GE NOS 1966 (10ma/8.6ma)
(!!) (Best Value SIngle) 7199 Sylvania NOS 1970 (15ma pentode/6.2ma triode)
(!!) (Good Value Single) 7199 Sylvania like new 1962 (11ma pentode, 8.5ma triode)
(!!) (Single) 7199 Sylvania NOS 1960's (11.8ma pentode, 7.8ma triode)
(!!) 7199 RCA Black Plates NOS around 1960 era (9/7.8ma)
12X4 GE GM Delco gray plates "D" getter NOS 1960 era (49/40 and 50/40)
12X4 Tungsol branded Dumont black plates "D" getter NOS 1963 (47/40 and 49/40)
7199 RCA Black Plates NOS 1963 (10.4/7.6ma)
Dynaco ST-70 original condition 1960's
