When I was young, we had one of those AC/battery powered tube radios.? It was the only one I remember seeing but I'm sure they weren't that uncommon.? I never saw the innards, but I imagine the B+ probably was 90 V or so.? No vibrator, it was straight DC, or the AC>DC supply.
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What I remember about it was that the case of the radio was made out of what seemed to be very heavy durable cardboard.? Funny thing.
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In the old old days, I'm told you brought your battery-powered radio to a repair shop where they outfitted it with new batteries.? I think you could go several months on a charge before needing to replace batteries.? And then they came up with a way to run them on AC, and everything changed.? And then, decades later, they came up with a way to run them on batteries, and everything changed again.
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Andy
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