{"product_id":"12au7-ecc82-amperex-nos-nib-heerlen-1962-short-gray-plates-large-halo-balanced-amplitrex-tested","title":"12AU7 \/ ECC82 AMPEREX NOS NIB Heerlen 1962 - Short Gray Plates - Large Halo - Balanced - Amplitrex Tested","description":"\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003e12AU7 \/ ECC82 AMPEREX NOS NIB Heerlen 1962 - Short Gray Plates - Large Halo - Balanced - Amplitrex Tested\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e\n\n \u003cstrong\u003eDescription:\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e This \u003cspan class=\"s1\"\u003e\u003cb\u003eAmperex 12AU7 \/ ECC82\u003c\/b\u003e\u003c\/span\u003e , produced in the historic \u003cspan class=\"s1\"\u003e\u003cb\u003eHeerlen (Holland) factory in 1962\u003c\/b\u003e\u003c\/span\u003e , represents one of the most balanced and musically refined European versions of the famous double triode.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eshort gray plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003elarge halo getter\u003c\/b\u003e\u003c\/span\u003e is typical of Dutch production in the early 1960s, a period of full technical maturity for Philips\/Amperex. The example is \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS NIB (New Old Stock – New In Box)\u003c\/b\u003e\u003c\/span\u003e , never used, and tested in our laboratory with \u003cspan class=\"s1\"\u003e\u003cb\u003ethe Amplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e .\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003einternal sections are balanced\u003c\/b\u003e\u003c\/span\u003e , with a difference of around ~5%, an indicator of electrical coherence and operational stability, a quality particularly appreciated in precision hi-fi applications.\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Precise, compact, and well-controlled. The low range is articulated and tidy, with good depth and without excessive emphasis.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cb\u003eMids:\u003c\/b\u003e Transparent, natural, and well-structured. Voices are credible and bright, while acoustic instruments emerge with clarity and well-defined harmonics, typical of the Heerlen school.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cb\u003eHighs:\u003c\/b\u003e Open, airy, and finely refined. The top end is extended yet composed, with a fine grain that enhances high-resolution systems.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cb\u003eDynamics:\u003c\/b\u003e Lively yet controlled. Excellent microdynamics and responsiveness to transients, with smooth and coherent musical reproduction.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003e\u003cb\u003eSoundstage:\u003c\/b\u003e Wide, stable, and three-dimensional. The soundstage is well-focused, with natural separation of planes and good perspective depth.\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Ideal for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e medium-high and high quality line preamplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e driver stages and phase inverters\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e amplifiers that require silence and coherence between sections\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e Particularly suitable for jazz, chamber music, vocal and high definition recordings.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003e🎸 Use in Music Applications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p3\"\u003e Also suitable for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e instrument amplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e studio equipment\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e sensitive positions thanks to good internal coherence and electrical stability\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p3\"\u003e It offers harmonious balance and predictable response over time.\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003e🎯 Note for audiophiles and technicians\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e\n\n \u003cspan class=\"s1\"\u003eOriginal\u003c\/span\u003e \u003cb\u003eAmperex production – Heerlen, Holland – 1962\u003c\/b\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eNOS NIB\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e Short Gray Plates – Large Halo Getter\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eBalanced internal sections (~5% difference)\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n \u003cspan class=\"s1\"\u003eTested on\u003c\/span\u003e \u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003cp class=\"p3\"\u003eA model that combines historical authenticity, electrical balance and tonal refinement, designed for those who want the true Amperex Heerlen sound of the golden years, in full Vacuum Tubes Treasures style.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003eTest Results:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eValve tested on AMPLITREX AT-1000 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -8.5V\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Gm = 2200 ; Ia = 10.5 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 1900 ; Ia = 9.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 2000 ; Ia = 10.4 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e Excellent – ​​Excellently preserved lettering, minimal signs of wear. See photos for details.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp style=\"text-align: left;\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":56840104477020,"sku":"03444-ONSPEC","price":279.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/12_b555109a-f7ab-4505-9720-5e5bf268bb52.jpg?v=1772030139","url":"https:\/\/vacuumtubestreasures.com\/en-ie\/products\/12au7-ecc82-amperex-nos-nib-heerlen-1962-short-gray-plates-large-halo-balanced-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}