{"product_id":"6eu7-mullard-blackburn-short-plates-matched-pair-made-in-gt-britain-60s-amplitrex-tested","title":"6EU7 MULLARD Blackburn Short Plates Matched Pair Made in GT. BRITAIN ’60s - AMPLITREX Tested","description":"\u003cp class=\"p1\"\u003e\u003cb\u003e6EU7 MULLARD Blackburn Short Plates – Matched Pair – Made in GT. BRITAIN ’60s\u003c\/b\u003e\u003cspan class=\"s2\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis pair of \u003cspan class=\"s1\"\u003e\u003cb\u003e6EU7 Mullard Blackburn\u003c\/b\u003e\u003c\/span\u003e tubes, \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in GT. BRITAIN\u003c\/b\u003e\u003c\/span\u003e in the 1960s, represents a highly sought-after selection for those seeking the authentic musical character of the best vintage British productions.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe 6EU7 is a high-gain dual triode, electrically similar to the 12AX7\/ECC83 family but with different pinouts, often used in hi-fi and musical amplifiers where a quiet, stable tube capable of delivering rich and refined tonal rendering is required.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eShort Plates Mullard Blackburn\u003c\/b\u003e\u003c\/span\u003e construction is particularly valued for its balance, naturalness, and harmonic density. This pair has been selected as a \u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Pair\u003c\/b\u003e\u003c\/span\u003e, tested on an \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e, and classified as \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e, with \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e behavior.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThese are vintage tubes that have been tested and are in perfect working order. Aesthetically, one of the two tubes no longer has its silkscreen on the glass, but the identification remains consistent with the internal construction and Mullard Blackburn characteristics. Please refer to the photos for aesthetic details.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003eSonic Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThe 6EU7 Mullard Blackburn offers a full, elegant, and very musical sound, with a typically British tonal signature: body, fluidity, rich mids, and a never fatiguing presentation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003cbr\u003eThe bass is round, controlled, and well integrated into the musical message. It doesn't aim for artificial impact, but provides a solid, natural, and consistent foundation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003cbr\u003eThe mid-range is the true strength: vocals, guitars, strings, and acoustic instruments sound present, dense, and harmonically credible, with that pleasant physicality typical of the best Mullard productions.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003cbr\u003eThe highs are sweet, refined, and well-extended, without harshness. The high range contributes to a sense of continuous musicality, maintaining detail and airiness without becoming aggressive.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003cbr\u003eThe dynamic response is fluid and progressive, with excellent ability to follow musical variations without stiffening the reproduction. The pair is stable, consistent, and pleasant even during prolonged listening sessions.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003cbr\u003eThe soundstage is orderly, natural, and well-proportioned, with good depth and credible instrument separation. The presentation favors cohesion and musicality rather than an artificially analytical effect.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎧\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003eUse in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIn the hi-fi domain, this pair is suitable for equipment compatible with the 6EU7, especially where a refined, silent, and musically engaging sound is desired. The \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection makes it suitable even for sensitive circuits, always provided the equipment is correctly compatible.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎸\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003eUse in Musical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIn instrument amplifiers using 6EU7, this Mullard Blackburn pair can offer a warm, harmonically rich, and very expressive tone. It is particularly interesting for those seeking a vintage response, with progressive saturation, full mids, and a sweet yet present high range.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎯\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003eNote for audiophiles\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis is a selected and tested \u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Pair Mullard Blackburn\u003c\/b\u003e\u003c\/span\u003e, with a \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e result and \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e behavior. One of the two tubes lacks silkscreen on the glass, but the pair retains full technical and sonic interest thanks to its consistent construction, matching, and high test results.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eA rare and musically captivating Mullard Blackburn pair, designed for those who wish to enhance their equipment with a vintage British selection, strong, quiet, and rich in authentic vintage sonic character.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube tester:\u003cbr\u003eVoltage Test: Va = 250V, Vg = -2V\u003cbr\u003eAverage 100% Gm = 1.6; Ia = 1.2 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1.6; Ia = 1.0 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 1.6; Ia = 1.1 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1.6; Ia = 1.2 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 1.4; Ia = 0.8 mA\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 suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1 position.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eNoise:\u003c\/strong\u003e Low and well controlled. Quiet operation in hi-fi and musical amplifiers in designated positions.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts 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\n\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003cspan\u003e Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003eFully operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAesthetic Conditions:\u003c\/strong\u003e\u003cspan\u003e One tube with missing silkscreen on the glass\u003c\/span\u003e. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cspan\u003e B3G1\u003c\/span\u003e→ B → Mullard, Blackburn - 3 (out of four digits) → 1963 - G → July - 1 → 1st week of the month\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\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\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"MULLARD","offers":[{"title":"Default Title","offer_id":57492983873884,"sku":"03558Z","price":3204.0,"currency_code":"CZK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/4_e3e0978b-f975-4364-84fb-2b2680db56bc.jpg?v=1777483795","url":"https:\/\/vacuumtubestreasures.com\/en-cz\/products\/6eu7-mullard-blackburn-short-plates-matched-pair-made-in-gt-britain-60s-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}