2 X 6679 / 12AT7 GE TUBE. 1960s PROD. BLACK PLATES . MATCHED PAIR. 31. CH165

2 X 6679 / 12AT7 / ECC81 TUBE. 1950s PRODUCTION. BLACK PLATES, RECTANGULAR TILTED GETTER, COPPER RODS, MATCHED PAIR. TESTED IN AMPLITREX AT1000 TUBE TESTER.

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