{"product_id":"12ax7-ecc83-nos-mullard-heerlen-1958-long-gray-plates-foil-getter-amplitrex-tested","title":"12AX7 \/ ECC83 NOS MULLARD – Heerlen 1958 – Long Gray Plates – Foil Getter – AMPLITREX Tested","description":"\u003cp\u003e\u003cstrong\u003e12AX7 \/ ECC83 NOS MULLARD – Heerlen (Holland) 1958\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLong Gray Plates – Foil Getter –\u003cmeta charset=\"utf-8\"\u003e Well Balanced – Low Noise \u0026amp; Microphonics\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"642\" data-start=\"422\"\u003eThis 12AX7 \/ ECC83 NOS MULLARD, produced in the Philips factory in Heerlen (Holland) in November 1958 (mC6 Δ8K), represents one of the most fascinating European versions of the early long plate foil getter era.\u003c\/p\u003e\n\u003cp data-end=\"861\" data-start=\"644\"\u003eThe construction with \u003cstrong data-end=\"697\" data-start=\"663\"\u003eLong Gray Plates and Foil Getter\u003c\/strong\u003e identifies a production phase sought after for the refinement of timbre, the airiness and naturalness of the sound reproduction typical of the Heerlen school of the late 1950s.\u003c\/p\u003e\n\u003cp data-end=\"1079\" data-start=\"863\"\u003eThis example is in \u003cstrong data-end=\"908\" data-start=\"880\"\u003eauthentic NOS condition\u003c\/strong\u003e , tested on an AMPLITREX AT-1000, with well-matched sections and stable operation. A tube that combines historical value, Philips build quality, and great musicality.\u003c\/p\u003e\n\u003ch3 data-end=\"1347\" data-start=\"1322\"\u003e\u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"1360\" data-start=\"1349\"\u003e\u003cstrong\u003eBass:\u003c\/strong\u003e Precise, well-defined, and controlled. The low range is articulated and never intrusive, with excellent intelligibility.\u003c\/p\u003e\n\u003cp data-end=\"1482\" data-start=\"1472\"\u003e\u003cstrong\u003eMids:\u003c\/strong\u003e Clear, open, and natural. Compared to the Blackburn school, the Heerlen character is slightly brighter and airier, with great transparency in the vocals.\u003c\/p\u003e\n\u003cp data-end=\"1652\" data-start=\"1642\"\u003e\u003cstrong\u003eHighs:\u003c\/strong\u003e Extended and refined, with an elegant and well-integrated brilliance. The highs are detailed but still musical.\u003c\/p\u003e\n\u003cp data-end=\"1784\" data-start=\"1770\"\u003e\u003cstrong\u003eDynamics:\u003c\/strong\u003e Reactive and fluid, with good microdynamics and excellent readability of complex passages.\u003c\/p\u003e\n\u003cp data-end=\"1890\" data-start=\"1874\"\u003e\u003cstrong\u003eSoundstage:\u003c\/strong\u003e Wide and well-ventilated, with excellent separation between instruments and a natural sense of depth.\u003c\/p\u003e\n\u003ch3 data-end=\"2025\" data-start=\"1993\"\u003e\u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"2056\" data-start=\"2027\"\u003eParticularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2098\" data-start=\"2060\"\u003einput and pre-amplification stages,\u003c\/li\u003e\n\u003cli data-end=\"2161\" data-start=\"2101\"\u003ehi-fi systems where greater openness and airiness is desired,\u003c\/li\u003e\n\u003cli data-end=\"2231\" data-start=\"2164\"\u003econfigurations that benefit from transparency and harmonious detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2329\" data-start=\"2233\"\u003eExcellent for jazz, acoustic music, vocal music and repertoire where natural timbre is a priority.\u003c\/p\u003e\n\u003ch3 data-end=\"2370\" data-start=\"2336\"\u003e\u003cstrong\u003e🎸 Use in Music Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"2392\" data-start=\"2372\"\u003eAlso appreciated in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2442\" data-start=\"2396\"\u003evintage and boutique guitar amplifiers,\u003c\/li\u003e\n\u003cli data-end=\"2509\" data-start=\"2445\"\u003eposition V1 when looking for clarity and harmonic definition.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2624\" data-start=\"2511\"\u003eIt offers articulation, natural dynamic response and the typical Philips Heerlen tonal balance of the late 1950s.\u003c\/p\u003e\n\u003ch3 data-end=\"2655\" data-start=\"2631\"\u003e\u003cstrong\u003e🎯 Note for audiophiles\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-end=\"2815\" data-start=\"2752\"\u003eOriginal Philips Heerlen production with engraved code mC6 Δ8K\u003c\/li\u003e\n\u003cli data-end=\"2838\" data-start=\"2818\"\u003etrue NOS condition\u003c\/li\u003e\n\u003cli data-end=\"2870\" data-start=\"2841\"\u003eAMPLITREX professional test\u003c\/li\u003e\n\u003cli data-end=\"2923\" data-start=\"2873\"\u003eearly era long plate foil getter construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3069\" data-start=\"2925\"\u003eA valve of great historical and musical value, capable of offering an open, refined and natural sound in true Vacuum Tubes Treasures style.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 250V ; Vg = -2V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1600 ; Ia = 1.2 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\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e \u003cspan\u003eGm = 1600 ; Ia = 1.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\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 Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eNoise:\u003c\/strong\u003e Low and well-controlled. Silent operation in hi-fi and music amplifiers in the intended positions.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections present a coherent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between the sections is not required.\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 mC6 Δ8K (Barely perceptible) - Δ8I \u003cmeta charset=\"utf-8\"\u003eΔ8K → Heerlen (Holland), 8 (on three digits) → 1958 - K → November\u003cbr\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\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":"MULLARD","offers":[{"title":"Default Title","offer_id":56699410776412,"sku":"03418","price":199.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_189daa31-fcc7-4fe4-b20b-b500e6ce8443.jpg?v=1770825027","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/12ax7-ecc83-nos-mullard-heerlen-1958-long-gray-plates-foil-getter-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}