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(!!!!!) (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)
(!!!!) (Best Single) ECC801S=12AT7 Telefunken Germany <> bottom NOS 1966 (10.2/10.3ma) 1-2% section balance (transparent - open)
