{"product_id":"hewlett-packard-420a-crystal-detector-4421-vintage-rf-component","title":"Hewlett Packard 420A Crystal Detector 4421, Vintage RF Component","description":"Hewlett Packard Model 420A Crystal Detector - Made in USA - Vintage RF Component\u003cbr\u003e\u003cbr\u003eThe detector measures approximately 3\/4\" in diameter and 3 5\/8\" long.\u003cbr\u003e\u003cbr\u003eVintage Hewlett Packard Model 420A crystal detector. All-metal construction, made in the USA. This unit is untested and is being sold as-is, with only what is shown in the photos included. Ideal for RF engineers, vintage electronics collectors, or restoration projects. \u003cbr\u003e\u003cbr\u003eThis is free shipping to the Continental United States.\u003cbr\u003eInstagram: theoldgrainery\u003cbr\u003eFacebook: The Old Grainery Architectural Salvage and Antiques\u003cbr\u003e\u003cbr\u003eYou are also welcome to visit or call us Monday-Friday 9am-4pm Central Time to discuss purchases.  Our number is 217-779-3992.  Be prepared with the title.  \u003cbr\u003eOur address is The Grainery 6411 Ehrhardt Rd Payson, IL  62360","brand":"The Old Grainery","offers":[{"title":"Default Title","offer_id":46911990661273,"sku":"25-128352","price":115.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0497\/9359\/7593\/files\/48a5cc5c-42eb-5379-aea2-97b30f558fb3.jpg?v=1754603092","url":"https:\/\/www.theoldgrainery.com\/products\/hewlett-packard-420a-crystal-detector-4421-vintage-rf-component","provider":"The Old Grainery","version":"1.0","type":"link"}