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(!!!!!) (BEST PAIR 1961) 12AU7=ECC82 Mullard UK ribbed plates NOS 1961 same date codes (9.0/8.8ma and 9.3/9.2ma) (same Gm) 1-3% matched
(!!!!!) (BEST PAIR 1963) 12AU7=ECC82 Mullard UK ribbed plates NOS 1963 same date codes (9.5/8.6ma and 9.0/8.6ma) (close Gm) 1-3% matched
(!!!!!) (PAIR 1961-1962) 12AU7=ECC82 Mullard BVA UK ribbed plates NOS 1961-1962 (10/8.6ma and 10/8.8ma) (close Gm) 1-3% matched
