Some AC plug in's have an auxiliary contact that disconnects the battery. Have you tried unplugging the AC connector?Repairing portable radio, AC works, batt doesn't. I have 2 radios from the 1960s-70s. Both are VISCOUNT 1860.
It has a direct AC plug-in with a two-prong connection. The AC works fine but the batteries do not work at all. It has an AC/DC switch, but switching it does not help. Both radios have the exact same issue.View attachment 190113
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