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(!!!!) (Best Pair #1) ECC83=12AX7 BRIMAR EDISWAN VALVE England gray ribbed plates "o" getter NOS 1960's (1.6/1.5ma and 1.5/1.7ma)
(!!!!!) (Best Pair #1) 6L6GC RCA black plate NOS 1976 same date codes (68ma and 67.2ma) (Same Gm)
(!!!!!) (Best Overall Pair) 12AX7=ECC83 Philips Holland NOS 1968-1969 (1.7/1.6ma and 1.6/1.6ma) (Highest mA and Gm) 1-2% matched (Same Gm)
(!!!!!) (Best Pair #1) ECC83=12AX7 Mullard UK branded Philips ribbed plates NOS 1964-1969 (163 series) (1.5/1.4ma and 1.3/1.4ma) (sweet sound) (Close Gm)
(!!!!!) (Best Pair) ECC801S=12AT7 Telefunken Germany <> bottom NOS triple mica 1965 and 1966 (9.6/9.6mA and 9.5/9.2mA) (1-3% matched) (transparent and open)
