{"product_id":"12ax7-ecc83-nos-mullard-blackburn-1959-matched-pair-short-gray-plates-halo-getter-same-data-code-amplitrex-tested","title":"12AX7 \/ ECC83 NOS MULLARD – Blackburn 1959 – Matched Pair – Short Gray Plates – Halo Getter – Same Data Code – AMPLITREX Tested","description":"\u003cp class=\"p1\"\u003e \u003cstrong\u003e12AX7 \/ ECC83 NOS MULLARD – Blackburn 1959 – Short Gray Plates – Halo Getter – Matched Pair – Same Data Code I61 B9K – AMPLITREX Tested\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e This \u003cspan class=\"s1\"\u003e\u003cb\u003ematched pair of NOS Mullard 12AX7\/ECC83s\u003c\/b\u003e\u003c\/span\u003e , produced in the historic \u003cspan class=\"s1\"\u003e\u003cb\u003eBlackburn (Great Britain)\u003c\/b\u003e\u003c\/span\u003e factory in \u003cspan class=\"s1\"\u003e\u003cb\u003e1959\u003c\/b\u003e\u003c\/span\u003e , represents one of the most appreciated configurations of the British Mullard production.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The valves have the classic internal structure:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eShort Gray Plates\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eHalo Getter\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eMullard Blackburn production\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eidentical data code: I61 B9K\u003c\/b\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eI61\u003c\/b\u003e\u003c\/span\u003e code identifies the famous Mullard structure for ECC83 with \u003cspan class=\"s1\"\u003e\u003cb\u003eshort plates\u003c\/b\u003e\u003c\/span\u003e , while \u003cspan class=\"s1\"\u003e\u003cb\u003eB9K\u003c\/b\u003e\u003c\/span\u003e confirms the \u003cspan class=\"s1\"\u003e\u003cb\u003eBlackburn 1959\u003c\/b\u003e\u003c\/span\u003e production, one of the most sought-after periods by enthusiasts.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The specimens are \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS (New Old Stock)\u003c\/b\u003e\u003c\/span\u003e and are presented in \u003cspan class=\"s1\"\u003e\u003cb\u003eshowcase aesthetic condition\u003c\/b\u003e\u003c\/span\u003e , with perfectly preserved silkscreen prints and internal construction.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e Both tubes have been \u003cspan class=\"s1\"\u003e\u003cb\u003ethoroughly tested in our laboratory with the AMPLITREX AT-1000\u003c\/b\u003e\u003c\/span\u003e , verifying emission, stability and operating behavior. They also proved to be \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e , qualities that make them \u003cspan class=\"s1\"\u003e\u003cb\u003esuitable even for the V1 position\u003c\/b\u003e\u003c\/span\u003e in the most sensitive circuits.\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n \u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMullard Blackburn ECC83s\u003c\/b\u003e\u003c\/span\u003e are renowned for their natural musicality and warm, engaging character, which has made these tubes a favorite among audiophiles and musicians.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Deep and well-controlled. The low end is full and authoritative, with an excellent balance between body and precision.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eMids:\u003c\/b\u003e The strong point of the Mullard tradition. Vocals sound rich, three-dimensional, and very natural, while acoustic instruments and harmonics emerge with great presence.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eHighs:\u003c\/b\u003e Sweet and refined. The highs are well-extended yet elegant, with a fine texture that encourages long, relaxed listening.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eDynamics:\u003c\/b\u003e Very fluid. Dynamic variations are reproduced naturally and seamlessly, always maintaining great musicality.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eSoundstage:\u003c\/b\u003e Wide and stable soundstage, with nice depth and very credible instrument separation.\u003c\/p\u003e\n\n \u003ch3\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎧\u003c\/span\u003e Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e \u003cspan class=\"s1\"\u003e\u003cb\u003eMullard Blackburn ECC83s\u003c\/b\u003e\u003c\/span\u003e are among the most sought after tubes for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003etube preamplifiers\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003ephono stages\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003ehi-fi amplifier drivers\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e high-end vintage audio equipment\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p4\"\u003e \u003cspan class=\"s3\"\u003eThanks to the\u003c\/span\u003e \u003cb\u003elow noise and reduced microphonics\u003c\/b\u003e \u003cspan class=\"s3\"\u003e, this pair is perfectly suited even for the\u003c\/span\u003e \u003cb\u003emost critical positions of the circuit\u003c\/b\u003e \u003cspan class=\"s3\"\u003e, including\u003c\/span\u003e \u003cb\u003eV1\u003c\/b\u003e \u003cspan class=\"s3\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎸\u003c\/span\u003e Use in Music Applications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e In the world of musical instrument amplifiers, the \u003cspan class=\"s1\"\u003e\u003cb\u003e1950s Mullard ECC83s\u003c\/b\u003e\u003c\/span\u003e are considered a benchmark.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e They offer:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e rich and musical mediums\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e very expressive dynamic response\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e excellent timbre definition\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e Features that contribute to a warm, articulate and very musical sound.\u003c\/p\u003e\n\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\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eMullard–Blackburn (Great Britain)\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eYear of production: 1959\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eStructure I61 – Short Gray Plates\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eHalo Getter\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eIdentical Data Code: I61 B9K\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eMatched Pair\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eNOS – Showcase condition\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eLow Noise \u0026amp; Microphonics – also suitable for V1\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eAMPLITREX AT-1000 Tested\u003c\/b\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p3\"\u003e An \u003cspan class=\"s2\"\u003e\u003cb\u003eauthentic 1959 Mullard Blackburn pair\u003c\/b\u003e\u003c\/span\u003e , with \u003cspan class=\"s2\"\u003e\u003cb\u003eidentical production numbers\u003c\/b\u003e\u003c\/span\u003e , built in one of the most iconic factories in vacuum tube history. A combination of \u003cspan class=\"s2\"\u003e\u003cb\u003ebuild quality, musicality, and historic appeal\u003c\/b\u003e\u003c\/span\u003e that continues to make these ECC83s among the most sought-after by vintage audio enthusiasts.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e Valve tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 250V ; Vg = -2V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Result:\u003c\/strong\u003e STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve #1:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1:\u003c\/strong\u003e \u003cspan\u003eGm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 1800 ; Ia = 1.2 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve #2:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1:\u003c\/strong\u003e \u003cspan\u003eGm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 1800 ; Ia = 1.4 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\u003e\n\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\n\u003c\/li\u003e\n\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\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \n\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\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\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.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e I61 B9K→ I6x indicates an ECC83 with the sequential progression of x, where the increment of x indicates the production changes -\u003cmeta charset=\"utf-8\"\u003e B9K B → Mullard, Blackburn - 8 (over three figures) → 1959 - K → November\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\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":56991203754332,"sku":"03466","price":2661.0,"currency_code":"DKK","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_b0a47e08-359c-45fd-9265-45d8e07d7cc3.jpg?v=1773395386","url":"https:\/\/vacuumtubestreasures.com\/en-dk\/products\/12ax7-ecc83-nos-mullard-blackburn-1959-matched-pair-short-gray-plates-halo-getter-same-data-code-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}