How did old radios run without huge B-batteries?

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An early receiver-power article about a compact B-eliminator. The unlock locates the original circuit-era reference; vintage mains circuits require qualified safety review.

What the unlock delivers: the exact original article, issue, printed page number, and preserved source location. This is a historical reference locator—not a newly tested technique, downloadable kit, or claim of exclusive rights to the source.

#VintageRadio #RadioPower #Electronics
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