{"product_id":"12au7wa-e82cc-heinz-kauffman-triple-mica-black-plates-square-getter-made-in-usa","title":"12AU7WA \/ CV4003 \/ 6189 Heinz \u0026amp; Kauffman Triple Mica Black Plates Square Getter Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e12AU7WA \/ CV4003 \/ 6189 Heinz \u0026amp; Kauffman Triple Mica Black Plates Square Getter Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUltra Low Noise \u0026amp; Microphonics – \u003cspan\u003eSeries\u003cmeta charset=\"utf-8\"\u003e “Gammatron”\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"913\" data-start=\"0\"\u003eThis \u003cstrong data-end=\"98\" data-start=\"37\"\u003e12AU7WA \/ CV4003 Heinz \u0026amp; Kauffman – “Gammatron” production\u003c\/strong\u003e , made in the United States and intended for highly reliable military and industrial applications, represents one of the most valuable and difficult to find versions of the 12AU7WA family. The construction with \u003cstrong data-end=\"323\" data-start=\"308\"\u003etriple mica\u003c\/strong\u003e , \u003cstrong data-end=\"341\" data-start=\"325\"\u003eblack plates\u003c\/strong\u003e and \u003cstrong data-end=\"361\" data-start=\"344\"\u003esquare getter\u003c\/strong\u003e immediately highlights its superior standard: maximum resistance to vibration, extremely low microphonics and extraordinary electrical stability. \u003cbr data-end=\"526\" data-start=\"523\"\u003eThe unit was \u003cstrong data-end=\"579\" data-start=\"546\"\u003etested with the Amplitrex AT-1000\u003c\/strong\u003e in our lab, reporting \u003cstrong data-end=\"635\" data-start=\"625\"\u003eSTRONG\u003c\/strong\u003e results, fully compliant with high-end hi-fi applications, professional preamplifiers, studio equipment and circuits requiring a robust, quiet and linear tube. A reference choice for those seeking the highest levels of build quality and tone.\u003c\/p\u003e\n\u003cp data-end=\"1220\" data-start=\"915\"\u003e\u003cstrong data-end=\"943\" data-start=\"917\"\u003eSound Characteristics\u003c\/strong\u003e\u003cbr data-end=\"946\" data-start=\"943\"\u003eThe 12AU7WA “Gammatron” delivers a clear, authoritative, and artifact-free tone. The \u003cstrong data-end=\"1075\" data-start=\"1045\"\u003etriple mica and black plate\u003c\/strong\u003e combination delivers an ideal balance of body, transparency, and refinement, delivering a consistently stable and consistent sound even in complex configurations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1404\" data-start=\"1222\"\u003e\u003cstrong data-end=\"1231\" data-start=\"1222\"\u003eBass\u003c\/strong\u003e \u003cbr data-end=\"1234\" data-start=\"1231\"\u003eClean, controlled, and well-defined lows. No bloat, excellent weight and definition. The response remains solid even with dynamic music or dense recordings.\u003c\/li\u003e\n\u003cli data-end=\"1607\" data-start=\"1406\"\u003e\u003cstrong data-end=\"1414\" data-start=\"1406\"\u003eMedium\u003c\/strong\u003e\u003cbr data-end=\"1417\" data-start=\"1414\"\u003eRich, natural, and very musical. Voices emerge with material realism, while acoustic and jazz instruments display a fine and believable harmonic texture. The mids are never dull, never aggressive.\u003c\/li\u003e\n\u003cli data-end=\"1787\" data-start=\"1609\"\u003e\u003cstrong data-end=\"1617\" data-start=\"1609\"\u003eHigh\u003c\/strong\u003e\u003cbr data-end=\"1620\" data-start=\"1617\"\u003eSmooth, bright, and well-extended. No harshness, no annoying peaks: refined, airy highs with excellent micro-detail. Elegant and consistently pleasant timbre.\u003c\/li\u003e\n\u003cli data-end=\"1990\" data-start=\"1789\"\u003e\u003cstrong data-end=\"1801\" data-start=\"1789\"\u003eDynamics\u003c\/strong\u003e\u003cbr data-end=\"1804\" data-start=\"1801\"\u003eSuperior responsiveness: quick engagement, precise release, excellent control even under variable load conditions. The valve maintains exemplary linearity under dynamic changes.\u003c\/li\u003e\n\u003cli data-end=\"2216\" data-start=\"1992\"\u003e\u003cstrong data-end=\"2006\" data-start=\"1992\"\u003eSoundstage\u003c\/strong\u003e \u003cbr data-end=\"2009\" data-start=\"2006\"\u003eOrganized, wide, and deep soundstage. Excellent instrument separation, stable and balanced imaging. The \"Gammatron\" contributes to a clean and credible soundstage, ideal for critical listening.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2590\" data-start=\"2218\"\u003e🎧 \u003cstrong data-end=\"2258\" data-start=\"2221\"\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\u003cbr data-end=\"2261\" data-start=\"2258\"\u003eExcellent in tube preamps, driver sections of push-pull or single-ended amplifiers, tube-based DACs, and high-end equipment requiring quiet operation and tonal balance. Perfect for jazz, classical, acoustic, and high-resolution listening.\u003cbr data-end=\"2536\" data-start=\"2533\"\u003eAn absolute top-notch 12AU7WA for premium systems.\u003c\/p\u003e\n\u003cp data-end=\"2876\" data-start=\"2592\"\u003e🎸 \u003cstrong data-end=\"2628\" data-start=\"2595\"\u003eUse in Music Amplifiers\u003c\/strong\u003e\u003cbr data-end=\"2631\" data-start=\"2628\"\u003eIt's a great driver tube in boutique guitar amplifiers, providing headroom, clarity, responsiveness, and a rich, organic midrange. It's also excellent in studio environments, vintage microphone preamps, and professional rack units.\u003c\/p\u003e\n\u003cp data-end=\"3408\" data-start=\"2878\"\u003e🎯 \u003cstrong data-end=\"2913\" data-start=\"2881\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003cbr data-end=\"2916\" data-start=\"2913\"\u003eThe 12AU7WA Heinz \u0026amp; Kauffman \u003cstrong data-end=\"2968\" data-start=\"2944\"\u003eGammatron production\u003c\/strong\u003e is considered one of the most solid and musical interpretations of the 12AU7WA series, thanks to the combination of \u003cstrong data-end=\"3092\" data-start=\"3077\"\u003etriple mica\u003c\/strong\u003e , \u003cstrong data-end=\"3110\" data-start=\"3094\"\u003eblack plates\u003c\/strong\u003e , \u003cstrong data-end=\"3129\" data-start=\"3112\"\u003esquare getter\u003c\/strong\u003e and high-end industrial selection.\u003cbr data-end=\"3173\" data-start=\"3170\"\u003eThis example is \u003cstrong data-end=\"3216\" data-start=\"3187\"\u003eAmplitrex Tested – STRONG\u003c\/strong\u003e , and comes in our certified packaging with a tamper-proof seal. This is a rare, prestigious tube, particularly prized by collectors and enthusiasts of quality vintage USA.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 250V ; Vg = -8.5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2200 ; Ia = 10.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eVERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1800 ; Ia = 8.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1800 ; Ia = 8.6 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 Very Low. Tested and approved for use in hi-fi, phono stages, and guitar amplifiers, including V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The two sections show coherent and well-aligned values, making the valve also ideal as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits 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\u003eConditions:\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eVintage - Tested and working - Supplied in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\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\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e \u003cspan\u003eUnreadable – Made in the USA, identifiable by construction features. Late 1950s – early 1960s\u003c\/span\u003e\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\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"HEINTZ \u0026 KAUFMAN","offers":[{"title":"Default Title","offer_id":55982001881436,"sku":"03269","price":500.0,"currency_code":"SEK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_317efec4-ef8d-48f7-99f0-30277594496d.jpg?v=1763228320","url":"https:\/\/vacuumtubestreasures.com\/en-se\/products\/12au7wa-e82cc-heinz-kauffman-triple-mica-black-plates-square-getter-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}