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(SINGLE) JAN-12AT7WC Philips by Sylvania black plates NOS 1982 (6.0/8.8ma)
(!!!!) (Best Single #1) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (12.6ma/11.3ma) (mic grade)
(!!!!!) (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)
