{"product_id":"12ax7-ecc83-mazda-valve-tested-pair-same-date-codes-short-gray-plates-halo-getter-made-in-england-bva","title":"12AX7 \/ ECC83 Mazda Valve Tested Pair Same Date Codes Short Gray Plates Halo Getter Made in England BVA","description":"\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Mazda Valve – Selected Pair – Same Codes I62 \/ IK12 – Short Gray Plates – Halo Getter – Made in England BVA\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Selected Vintage Pair – Same Codes – British Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDescription\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003eThis selected pair of 12AX7 \/ ECC83 Mazda Valves, Made in England BVA production, represents an interesting British vintage selection with homogeneous internal construction, same production codes, and overall very solid electrical characteristics.\u003c\/p\u003e\n\u003cp\u003eThe tubes feature a structure with short gray plates, a top halo getter, and Mazda Valve \/ BVA markings. The visible codes I62 \/ IK12 are present on both tubes, an important element for production, aesthetic, and structural consistency.\u003c\/p\u003e\n\u003cp\u003eThe codes stamped on the glass are I62 \/ IK12. The I62 code identifies the ECC83 \/ 12AX7 family in its second constructive revision; the factory\/date code beginning with \"I\" is associated with Thorn-AEI \/ Ediswan, listed in Philips\/Mullard lists as \"Mullard supply\". For this reason, the pair is cautiously indicated as probable 1960s British production.\u003c\/p\u003e\n\u003cp\u003eThe internal construction is the classic British short plate ECC83 of the period, very close to the 1960s Mullard architecture, with a compact, solid, and highly appreciated setup in both hi-fi and musical applications.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eBritish ECC83 \/ 12AX7 with short plate structure are appreciated for a balanced, natural, and very pleasant musical presentation. This Mazda Valve pair offers the charm of vintage English production, with a generally refined, consistent, and well-controlled character.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"s1\"\u003eBass\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe low register is orderly, natural, and well-proportioned. It doesn't aim for an excessively emphasized bass, but for a stable and controlled foundation, capable of supporting the music with balance.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe mids represent one of the most interesting aspects of this type of British ECC83. Vocals are present, natural, and well-articulated, with a pleasant harmonic texture and a rendition very suitable for jazz, vocal, classical, blues, and acoustic music.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe high range is sweet, refined, and well-integrated. Detail is present without becoming aggressive, with a setting suitable for prolonged listening and systems where musicality is sought more than artificial brilliance.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe dynamic response is fluid and well-controlled. The tubes maintain good legibility in complex musical passages, with a balanced and consistent rendition.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThe soundstage is stable, orderly, and well-proportioned. While not a precision matched pair, the constructive consistency and electrical selection contribute to a natural and well-focused presentation in compatible circuits.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis pair of \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Mazda Valves\u003c\/b\u003e\u003c\/span\u003e is suitable for preamplifiers, line stages, phono stages, driver stages, and hi-fi circuits compatible with ECC83 \/ 12AX7.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe British short plate construction and the presence of the same codes make this pair particularly interesting for those who want a vintage English ECC83 with musical character, good stability, and historical charm.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎸 Use in Musical Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eIn compatible instrument amplifiers, these ECC83 Mazda Valves can offer a musical, balanced, and harmonically rich response.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe British short plate construction is often appreciated in vintage and boutique guitar circuits, where it can contribute to a natural, dynamic, and well-controlled sound, with expressive mids and a composed high range.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThey are suitable for preamplifier stages, drivers, and other compatible positions, always checking the device specifications.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for audiophiles and technicians\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p5\"\u003eThis pair represents a very interesting selection for those looking for two \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Mazda Valves Made in England BVA\u003c\/b\u003e\u003c\/span\u003e with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003esame codes \u003c\/span\u003e\u003cspan class=\"s2\"\u003e\u003cb\u003eI62 \/ IK12\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s1\"\u003e;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003ehomogeneous construction;\u003c\/li\u003e\n\u003cli\u003eshort gray plates;\u003c\/li\u003e\n\u003cli\u003ehalo getter;\u003c\/li\u003e\n\u003cli\u003eoverall electrical result \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e;\u003c\/li\u003e\n\u003cli\u003echarm of vintage British production.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eThis is not a precision matched pair, but a \u003cspan class=\"s1\"\u003e\u003cb\u003eSelected Vintage Pair\u003c\/b\u003e\u003c\/span\u003e chosen for production consistency, internal construction, and electrical solidity.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eA valuable solution for those who want to bring the classic character of English ECC83 production into their system, in the full style of Vacuum Tubes Treasures.\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\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 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\u003eTube #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e Gm = 1500 ; Ia = 1.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = 1800 ; Ia = 1.6 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e Gm = 1300 ; Ia = 0.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = 1600 ; Ia = 1.1 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 \u003c\/span\u003eLow. Suitable for many hi-fi and musical applications, particularly in line stages, drivers, and non-excessively critical preamplification positions.\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eNoise:\u003c\/strong\u003e Low and well-controlled. Silent operation in hi-fi and musical amplifiers in designated positions.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections are not perfectly aligned. The tubes are suitable for use in hi-fi in non-critical stages (input or driver) and in guitar amplifiers. Not recommended as a phase inverter or in applications requiring rigorous balance between sections.\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\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\u0026nbsp;\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u0026nbsp;\u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic Condition:\u003c\/strong\u003e Excellent – Markings well preserved, minimal signs of age. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u0026nbsp;\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eStamped codes:\u003c\/strong\u003e I62 \/ IK12\u003cbr\u003e\u003cstrong\u003eType:\u003c\/strong\u003e ECC83 \/ 12AX7, revision I62\u003cbr\u003e\u003cstrong\u003eFactory \/ supply:\u003c\/strong\u003e Thorn-AEI \/ Ediswan, Mullard supply\u003cbr\u003e\u003cstrong\u003eDating:\u003c\/strong\u003e\u0026nbsp;1960s British production\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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" 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":57630669832540,"sku":"03596","price":169.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_27983460-9a55-4aea-8330-a539cd7ce5f0.jpg?v=1778602204","url":"https:\/\/vacuumtubestreasures.com\/en-mc\/products\/12ax7-ecc83-mazda-valve-tested-pair-same-date-codes-short-gray-plates-halo-getter-made-in-england-bva","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}