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(!!!!) (Best Single #2) ECC802S=12AU7 Telefunken Germany <> bottom NOS 1960 good printing (10.4ma and 11.0ma) (close Gm) (oldest single)
(!!!!) (Best Single 1965) CV491=12AU7=ECC82 Mullard UK NOS ribbed plates 1965 (12.5/11.8ma) (High Gm)
