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(!!!!!) (Best Single) ECC801S=12AT7 Telefunken Germany <> bottom NOS 1966 (10.8/9.8ma)
(!!!!!) (Best Pair) ECC801S=12AT7 Telefunken Germany <> bottom NOS triple mica 1962 and 1970 (8.2/8.0mA and 8.3/8.6mA) (1-3% matched)