{"product_id":"ecc88-6dj8-mullard-blackburn-large-halo-getter-matched-pair-ga1-b1f-amplitrex-tested-made-in-great-britain-50s","title":"ECC88 \/ 6DJ8 MULLARD Blackburn Large Halo Getter - Matched Pair - GA1 B1F - AMPLITREX Tested - Made in Great Britain '50s","description":"\u003cp\u003e \u003cstrong\u003eECC88 \/ 6DJ8 MULLARD Blackburn Large Halo Getter - Matched Pair - GA1 B1F - AMPLITREX Tested - Made in Great Britain '50s\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 pair of \u003cspan class=\"s1\"\u003e\u003cb\u003eECC88 \/ 6DJ8 MULLARD\u003c\/b\u003e\u003c\/span\u003e comes from the historic \u003cspan class=\"s1\"\u003e\u003cb\u003eBlackburn factory (UK)\u003c\/b\u003e\u003c\/span\u003e and belongs to the original production of the 50s, identified by the manufacturing code \u003cspan class=\"s1\"\u003e\u003cb\u003eGA1 B1F\u003c\/b\u003e\u003c\/span\u003e , identical on both specimens.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The presence of the \u003cspan class=\"s1\"\u003e\u003cb\u003eLarge Halo Getter\u003c\/b\u003e\u003c\/span\u003e and the typical first generation Blackburn internal structure make this pair particularly sought after by enthusiasts of authentic pre-Philips rebranding Mullard productions.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eThe aesthetic condition is excellent, with well-preserved silkscreens and intact internal structure. These are used tubes, selected and tested on \u003cspan class=\"s1\"\u003e\u003cb\u003ethe Amplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e , with stable and consistent electrical results.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e A true original English production, not a reprint, not a modern selection.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e Stable output, regular behavior, no anomalies detected.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The matching between the two valves is correct for hi-fi use, with identical production and code.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eSound Character\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Mullard Blackburn '50s are known for their rich, harmonically dense, and natural tone.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cspan class=\"s1\"\u003e\u003cb\u003eBass:\u003c\/b\u003e\u003c\/span\u003e full but controlled, with excellent structure on the fundamentals.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cspan class=\"s1\"\u003e\u003cb\u003eMids:\u003c\/b\u003e\u003c\/span\u003e the real strong point — warm, textured, three-dimensional, with extremely realistic vocal reproduction.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cspan class=\"s1\"\u003e\u003cb\u003eHighs:\u003c\/b\u003e\u003c\/span\u003e soft and refined, never aggressive, with a fine, silky texture.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics:\u003c\/b\u003e\u003c\/span\u003e fluid, musical, with clearly perceptible micro-contrast.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage:\u003c\/b\u003e\u003c\/span\u003e deep and enveloping, with excellent central focus.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e It is a valve that favors timbral coherence and naturalness over artificial brilliance.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Particularly suitable for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e Line and phono preamplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e Quality driver stages\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e Tube DACs\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e OTL and hybrid amplifications\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e Perfect for those looking for an authentic musical presentation, with a classic British feel.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cb\u003e🎸 Use in Music Applications\u003c\/b\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Interesting in instrument circuits and contexts where a softer and more progressive response is appreciated, with natural compression.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cb\u003e🎯 Note for audiophiles and technicians\u003c\/b\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e The Mullard Blackburn Large Halo productions of the 1950s represent one of the most iconic expressions of the original British ECC88.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eThis pair, with identical code \u003cspan class=\"s1\"\u003e\u003cb\u003eGA1 B1F\u003c\/b\u003e\u003c\/span\u003e , retains production coherence and distinctive sonic character.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e This is not a NOS selection, but an authentic and stable pair, with solid and musically engaging performance — ideal for those who want to enter the world of vintage Mullards with a genuine and properly tested example.\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 Tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eVoltage Test:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVa = 90V ; Vg = -1.2V \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003c\/strong\u003e Gm = 12.5 ; Ia = 15.0 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e STRONG\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Section 1: Gm = 11.44 ; Ia = 13.8 mA\u003c\/li\u003e\n\n\u003cli\u003e Section 2: Gm = 11.00 ; Ia = 12.3 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e \u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e Section 1: Gm = 10.20 ; Ia = 10.0 mA\u003c\/li\u003e\n\n\u003cli\u003e Section 2: Gm = 10.00 ; Ia = 10.3 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\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, phono stages, and guitar amplifiers, including V1.\u003c\/span\u003e\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\n \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\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 \u003cspan\u003eExcellent – ​​Excellently preserved lettering, minimal signs of wear. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan class=\"s1\"\u003eGA1 B1F\u003c\/span\u003e →\u003cmeta charset=\"utf-8\"\u003e\n\n \u003cspan class=\"s1\"\u003eGA\u003c\/span\u003e x indicates an ECC88 with the sequential progression of x, where the increment of x indicates the production changes -\u003cmeta charset=\"utf-8\"\u003e \n\u003cspan class=\"s1\"\u003eB1F\u003c\/span\u003e B → Mullard, Blackburn - 1 (out of three digits) → 1951 - F → June\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\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\n\n\u003cp\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"MULLARD","offers":[{"title":"Default Title","offer_id":56770911109468,"sku":"03430","price":5075.0,"currency_code":"NOK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/9_ba3f4008-3a9b-4765-995e-4390ecbae3c3.jpg?v=1771514643","url":"https:\/\/vacuumtubestreasures.com\/en-no\/products\/ecc88-6dj8-mullard-blackburn-large-halo-getter-matched-pair-ga1-b1f-amplitrex-tested-made-in-great-britain-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}