{"product_id":"12x4-rca-test-nos-black-plates-getter-tube-rectifier-made-in-usa-57","title":"12X4 RCA NOS Black Plates Square Getter Tube Rectifier Made in USA '57","description":"\u003cp\u003e\u003cstrong\u003e12X4 RCA NOS Black Plates Square Getter Tube Rectifier\u003c\/strong\u003e \u003cstrong\u003eMade in USA '57\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"514\" data-start=\"141\"\u003eThe RCA 12X4, produced in the United States in 1957, is a miniature rectifier designed for reliability and quiet operation. This NOS version with black plates and a square getter is one of the most sought-after variants of the series, thanks to its robust construction and ability to provide a stable, linear power supply.\u003c\/p\u003e\n\u003cp data-end=\"546\" data-start=\"516\"\u003e\u003cstrong data-end=\"544\" data-start=\"518\"\u003eSound characteristics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"613\" data-start=\"549\"\u003e\u003cstrong data-end=\"558\" data-start=\"549\"\u003eBass\u003c\/strong\u003e : tight and dry, with excellent control and precision.\u003c\/li\u003e\n\u003cli data-end=\"708\" data-start=\"616\"\u003e\u003cstrong data-end=\"624\" data-start=\"616\"\u003eMedium\u003c\/strong\u003e : balanced and natural, with a clear rendering and free from unwanted colorations.\u003c\/li\u003e\n\u003cli data-end=\"785\" data-start=\"711\"\u003e\u003cstrong data-end=\"719\" data-start=\"711\"\u003eHighs\u003c\/strong\u003e : clear and well extended, with elegant and never aggressive detail.\u003c\/li\u003e\n\u003cli data-end=\"886\" data-start=\"788\"\u003e\u003cstrong data-end=\"800\" data-start=\"788\"\u003eDynamics\u003c\/strong\u003e : fast and coherent, capable of ensuring continuity even in complex passages.\u003c\/li\u003e\n\u003cli data-end=\"978\" data-start=\"889\"\u003e\u003cstrong data-end=\"903\" data-start=\"889\"\u003eSoundstage\u003c\/strong\u003e : Clean and focused, with a stable soundstage and low background noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1190\" data-start=\"980\"\u003e🎧 \u003cstrong data-end=\"999\" data-start=\"983\"\u003eHi-Fi use\u003c\/strong\u003e\u003cbr data-end=\"1002\" data-start=\"999\"\u003ePerfect as a rectifier for preamplifiers, tuners and vintage hi-fi equipment, the 12X4 RCA guarantees a linear and silent power supply, improving the overall sound output.\u003c\/p\u003e\n\u003cp data-end=\"1384\" data-start=\"1192\"\u003e🎸 \u003cstrong data-end=\"1227\" data-start=\"1195\"\u003eUse in Music Applications\u003c\/strong\u003e\u003cbr data-end=\"1230\" data-start=\"1227\"\u003eAlso suitable for instrument amplifiers, it provides a stable power supply that contributes to a warm, balanced sound with harmonic naturalness.\u003c\/p\u003e\n\u003cp data-end=\"1713\" data-start=\"1386\"\u003e🎯 \u003cstrong data-end=\"1427\" data-start=\"1389\"\u003eNote for audiophiles and collectors\u003c\/strong\u003e \u003cbr data-end=\"1430\" data-start=\"1427\"\u003eThe NOS 1957 RCA Black Plates Square Getter 12X4 is a premium and robust version, highly regarded for its ability to combine technical reliability and sound quality. An authentic piece for those who wish to preserve the original character of vintage American equipment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia =\u003cmeta charset=\"utf-8\"\u003e 42 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 46 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 47 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Very\u003cmeta charset=\"utf-8\"\u003e Low. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e Excellent – Excellently preserved lettering, minimal signs of wear. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e57 - 17 - Produced in the 17th week of 1957\u003c\/span\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43469405520119,"sku":"00955","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/12x4-rca-at-test-nos-black-plates-getter-tube-rectifier-made-in-usa-57-972829.jpg?v=1665926899","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/12x4-rca-test-nos-black-plates-getter-tube-rectifier-made-in-usa-57-en","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}