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Electrolytic capacitors weren't really a thing until the late 20s. Even a low value for a filter 4uF paper cap (2-4 with some LARGE chokes could work as a filter) was a MASSIVE expensive part back before AC powered sets came into vogue. Batteries may have been smaller and definitely were cheaper.
We adopted AC sets as soon as the technology was there for them to exist....
America so wanted AC radios that when they came out many towns literally had battery radio bonfires to celebrate switching to AC radios...Part of the reason 20s sets are rare today.
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