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(!!) (Best Pair #3) 6GJ7=ECF801 Mullard UK branded Amperex and RCA NOS 1970-1974 era (83-86/60 and 82-86/60)
(!!) (Best Pair #3) 6GJ7=ECF801 Mullard UK branded RCA NOS 1975-1976
(!!) (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)
6GJ7=ECF801 Siemens branded RCA NOS
6GJ7=ECF801 Sylvania made in JAPAN NOS (2 in stock)