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(!!!!!) (Best Mullard 1962) 12AX7=ECC83 Mullard UK BVA ribbed plates NOS copper grid posts 1962 (1.1/1.1ma) (same Gm) 1% section balance
(!!!!!) (Best Value Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1965 (1.0/0.9ma) (163 series)
(!!!!) (Single) ECC82=12AU7 Mullard BVA UK NOS ribbed plates 1967 in Kradlepack box (9.2/9.4ma)
