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(!!) (Best Pair) 6BH6 RCA NOS 1970 era (7.7ma and 8ma)
(!!) (BEST PAIR) 6BQ6GTB=6CU6 Sylvania JAN NOS 1960's (56ma and 56ma)
(!!) (BEST PAIR) 6BQ6GTB=6CU6 Sylvania NOS 1960's (54ma and 54.5ma)
(!!) (BEST PAIR) 6BQ6GTB=6CU6 Sylvania NOS 1960's (62ma and 61.5ma)
(!!) (Best Pair) 6CW4 Sylvania NOS 1960's (120/60 and 120/60)
(!!) (Best Pair) 6CZ5 RCA black plate 1960's same build (49.5ma and 51ma)
(!!) (BEST PAIR) 6DQ6B Sylvania NOS 1960's same build (78ma and 80ma)
(!!) (Best Pair) 6F8G Raytheon black parallel ribbed plates NOS 1940's (8.8/7.8ma and 7.4/7.6ma) (same Gm)
(!!) (Best Pair) 6GJ7=ECF801 Dumont Japan NOS 1970's (80-81/60 and 80-81/60) 1-2% matched
(!!) (Best Pair) 6GJ7=ECF801 GE USA NOS 1960's - 1970's (82-86/60 and 82-85/60)
(!!) (Best Pair) 6GK5=6FQ5A Hitachi Japan rebranded Raytheon and GE NOS 1970 era (9.6/10ma)
(!!) (Best Pair) 6J6A Tungsol NOS "D" getter 1961 (9.4/10.5ma and 9.0/11.4ma)
(!!) (Best Pair) 6KM6 Sylvania NOS (148ma and 147ma)
(!!) (BEST PAIR) 6LR6 RCA NOS 1970 era (86ma and 96ma)
(!!) (Best Pair) 6SH7 GE metal can NOS 1976 (11.5ma and 11.6ma) **
(!!) (Best Pair) ECC40 Philips Import NOS made by La Radiotechnique, Chartres/France 1960 (6.0/6.2ma and 6.1/6.4ma) (Same Gm) 1-2% matched
(!!) (Best Pair) ECC40 Philips NOS made by La Radiotechnique, Chartres/France 1969 (6.5/6.5ma and 6.8/6.7ma) 1-3% matched
(!!) (Best Pair) ECC40 Philips NOS made by La Radiotechnique, Chartres/France 1969 (6.8/6.3ma and 6.8/6.4ma) 1-3% matched
(!!) (BEST PAIR) FAA-12AL5 Sylvania NOS 1965 (47-47/40 and 47-48/40)
(!!) (BEST PAIR) FAA-12AL5 Sylvania NOS 1965 (48-48/40 and 48-48/40)
