2 Mullard ECC83 12AX7 yellow print British 1963 tested

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You are biding on a pair of MULLARD British made ECC83. O ring getter. COPPER POSTS Good Old shield markings - yellow print. AVO tested with Ia valve 1 at 1.0 and 1.2Ia valve 2 at 1.1 and 1.15/A>