{"product_id":"12ax7-ecc83-eico-by-mullard-blackurn-short-gray-plates-halo-getter-made-in-gt-britain-62","title":"12AX7 \/ ECC83 EICO by MULLARD Blackburn Matched Pair Short Gray Plates Halo Getter Made in GT. BRITAIN '62","description":"\u003cp\u003e\u003cstrong\u003e12AX7 \/ ECC83 EICO by MULLARD Blackburn Matched Pair Short Gray Plates Halo Getter Made in GT. BRITAIN '62\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 EICO by MULLARD\u003c\/b\u003e\u003c\/span\u003e , produced in the historic \u003cspan class=\"s1\"\u003e\u003cb\u003eBlackburn\u003c\/b\u003e\u003c\/span\u003e factory in \u003cspan class=\"s1\"\u003e\u003cb\u003e1962\u003c\/b\u003e\u003c\/span\u003e , represent one of the most authentic and musically refined expressions of the great British Mullard school.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eEICO\u003c\/b\u003e\u003c\/span\u003e marking identifies a supply intended for the professional and hi-fi market, but the valve is in all respects a \u003cspan class=\"s1\"\u003e\u003cb\u003egenuine Mullard Blackburn\u003c\/b\u003e\u003c\/span\u003e , made according to the highest standards of the English golden age.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eshort gray plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003ehalo getter\u003c\/b\u003e\u003c\/span\u003e is typical of Mullard productions from the early 60s, appreciated for their stability, reliability and an unmistakable, warm and natural sound reproduction.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eBass:\u003c\/b\u003e Compact, rounded, and well-controlled. The low range is authoritative but never intrusive, with a musical and coherent response that gives structure to the sound message.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eMids:\u003c\/b\u003e The true Mullard trademark. Rich, dense, and harmonically complete, with extremely natural voices and a full, three-dimensional rendition of acoustic instruments.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eHighs:\u003c\/b\u003e Silky, well-extended, and refined. The highs are elegant and never aggressive, with a sweetness that favors long, engaging listening sessions.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eDynamics:\u003c\/b\u003e Fluid and natural. Transient response is prompt but always composed, with highly expressive microdynamics that are free from rigidity.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eSoundstage:\u003c\/b\u003e Wide, deep, and stable. The soundstage is well-layered, with realistic positioning and natural separation of musical lines.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎧\u003c\/span\u003e Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003emedium-high and high quality preamplifiers and input stages,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ehi-fi amplifiers that seek musicality, naturalness and timbral coherence.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eParticularly suitable for jazz, classical, vocal and acoustic music.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎸\u003c\/span\u003e Use in Music Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eAlso highly appreciated in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003evintage and boutique guitar amplifiers,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eapplications where rich harmonics, expressive mids and an authentically British sonic character are desired.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎯\u003c\/span\u003e Note for audiophiles and technicians\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003e\u003cspan class=\"s2\"\u003eThe\u003c\/span\u003e \u003cb\u003e12AX7 \/ ECC83 EICO by MULLARD Blackburn – Short Gray Plates – Halo Getter (1962)\u003c\/b\u003e \u003cspan class=\"s2\"\u003erepresent:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eauthentic\u003c\/span\u003e \u003cb\u003eMullard production Made in Great Britain\u003c\/b\u003e \u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eone of the most musical and appreciated versions of the 60s,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003esolid and historically correct construction,\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ewarm, natural and deeply engaging timbre.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eAn ideal choice for those who want \u003cspan class=\"s1\"\u003e\u003cb\u003ethe true Mullard Blackburn sound\u003c\/b\u003e\u003c\/span\u003e , with all the charm, elegance and musicality that have made these 12AX7s a timeless reference.\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 #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e \u003cspan\u003eGm = 1600 ; Ia = 1.1 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\u003cp\u003e\u003cstrong\u003eValve #2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e \u003cspan\u003eGm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 1100 ; Ia = 0.8 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 Vintage tubes - Tested and in perfect working order. Shipped 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 Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eI61 B2I2 → I6x indicates an ECC83 with the sequential progression of x, where the increment of x indicates the production changes -\u003cmeta charset=\"utf-8\"\u003e B2I2 B → Mullard, Blackburn - 2 (out of four digits) → 1962 - I → September - 2 → 2nd week of the month\u003c\/li\u003e\n\u003cli\u003e\u003cmeta charset=\"utf-8\"\u003e I61 B2K2 → I6x indicates an ECC83 with the sequential progression of x, where the increment of x indicates the production changes -\u003cmeta charset=\"utf-8\"\u003e B2I2 B → Mullard, Blackburn - 2 (out of four digits) → 1962 - K → November - 2 → 2nd week of the month\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\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\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"MULLARD","offers":[{"title":"Default Title","offer_id":56617087041884,"sku":"03400","price":249.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_49c9c876-281f-4096-a806-7a912107f0e5.jpg?v=1769881879","url":"https:\/\/vacuumtubestreasures.com\/en-si\/products\/12ax7-ecc83-eico-by-mullard-blackurn-short-gray-plates-halo-getter-made-in-gt-britain-62","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}