All Rights Reserved. at the time, Ed Tudor, jumped at the opportunity to manufacture the TR-1, predicting sales of the transistor radios at "20 million radios in three years". When base voltage is present, the switch is on. of Indianapolis, Indiana, were behind the unveiling of the Regency TR-1, the world's first commercially produced transistor radio. ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/9557"}}],"_links":{"self":"https://dummies-api.dummies.com/v2/books/292820"}},"collections":[],"articleAds":{"footerAd":"
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