{"product_id":"12au7-ecc82-mullard-mitcham-k61-short-plate-halo-getter-balanced-test-like-nos","title":"12AU7 \/ ECC82 MULLARD Mitcham k61 Short Plates Halo Getter Balanced Test Like NOS","description":"\u003ch3\u003e\u003cstrong\u003e12AU7 \/ ECC82 MULLARD Mitcham k61 – Short Plates – Halo Getter – Balanced Sections – Like NOS Performance – Made in GT.BRITAIN\u003c\/strong\u003e\u003c\/h3\u003e\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage UK MULLARD Production\u003c\/b\u003e\u003c\/p\u003e\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Results\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\u003cp class=\"p2\"\u003eTubes tested on\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp class=\"p3\"\u003e\u003cb\u003eTest Conditions:\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003eVa = 250V, Vg = -8.5V\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage 100%:\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eGm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Result:\u003c\/b\u003e\u003c\/span\u003e VERY STRONG\u003c\/p\u003e\u003cdiv\u003e\u003cstrong\u003eTube:\u003c\/strong\u003e\u003c\/div\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2100 ; Ia = 11.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2100 ; Ia = \u003cmeta charset=\"utf-8\"\u003e10.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAdditional Tests Performed\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMicrophonics:\u003c\/b\u003e Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBalance:\u003c\/b\u003e The sections are consistent and well-aligned, making the tubes suitable for use as phase inverters in hi-fi and instrumental applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eEmission Quality:\u003c\/b\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShorts and GAS:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 class=\"p2\"\u003e\u003cb\u003eDescription:\u003c\/b\u003e\u003c\/h3\u003e\u003cp\u003e\u003cspan\u003ePrecious \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AU7 \/ ECC82 Mullard Mitcham k61\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produced in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGreat Britain in 1960\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and characterized by the classic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShort Plates with Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, one of the most appreciated configurations of British Mullard production.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eThe manufacturing code \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ek61 R0A4\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifies \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMullard Mitcham\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e production, belonging to the historic English manufacturer that helped make the ECC82 one of the most sought-after tubes in hi-fi and professional fields. The internal construction is fully consistent with Mullard production of the period, known for material quality, stability, and long operational life.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eThe tube underwent \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48 hours of burn-in \/ stability test\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and was subsequently tested in our laboratory using an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000 Tube Tester\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, achieving a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVERY STRONG\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e classification. The two sections show excellent balance, and the tube was found to be \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with stable electrical behavior and performance comparable to that of an NOS specimen.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eSonically, Mullard ECC82s from this period are appreciated for rich, fluid, and natural reproduction, with full and well-controlled bass, rich and harmonically dense mids, refined and never aggressive high frequencies, and a wide, stable, and three-dimensional soundstage. The overall character is musical and engaging, with that typical combination of warmth, depth, and naturalness that made British Mullard production famous.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eIdeal for hi-fi preamplifiers, driver stages, phase inverters, tube DACs, headphone amplifiers, and instrumental applications compatible with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AU7 \/ ECC82\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Thanks to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e selection and well-balanced sections, it is particularly interesting for sensitive stages and applications where uniformity and stability are important.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eThe tube is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVintage\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, carefully tested, and fully functional. Aesthetic conditions are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003egood\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with partially eroded but still legible markings and the tube body in good overall condition.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eAn authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1960 Mullard Mitcham k61\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, truly tested and selected by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVacuum Tubes Treasures\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, ideal for those seeking a strong, quiet vintage British ECC82 with performance close to that of an NOS tube.\u003c\/span\u003e\u003c\/p\u003e\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eConditions\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eConditions:\u003c\/b\u003e Vintage tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFunctionality:\u003c\/b\u003e Fully operational.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAesthetic conditions:\u003c\/b\u003e Good – Markings partially eroded, but still legible. Tube body in good condition. See photos for details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eManufacturing Code:\u003c\/b\u003e k61 R0A4 → k6x indicates an ECC82 with sequential progression of x, where the increment of x indicates production changes - R0A4 R → Mullard, Mitcham - 0 (out of four digits) → 1960 - A → January - 4 → 4th week of the month\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cspan class=\"s2\"\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\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"MULLARD","offers":[{"title":"Default Title","offer_id":58842497450332,"sku":"03443","price":210.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/s-l1600_481a8e68-a1e9-421e-87db-3fd8b846f8b7.webp?v=1787842613","url":"https:\/\/vacuumtubestreasures.com\/en-ch\/products\/12au7-ecc82-mullard-mitcham-k61-short-plate-halo-getter-balanced-test-like-nos","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}