{"product_id":"12au7wa-cv4003-6189-heinz-kauffman-black-plates-halo-getter-made-in-usa","title":"12AU7WA \/ CV4003 \/ 6189 Heinz \u0026 Kauffman Black Plates Halo Getter Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e12AU7WA \/ CV4003 \/ 6189 Heinz \u0026amp; Kauffman Black Plates Halo Getter Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLow 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 class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7WA \/ CV4003 \/ 6189 Heinz \u0026amp; Kauffman – “Gammatron” Series\u003c\/b\u003e\u003c\/span\u003e , \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA\u003c\/b\u003e\u003c\/span\u003e , represents one of the most select and valuable variants of the military-industrial 12AU7 family. The construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eblack plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003ehalo getter\u003c\/b\u003e\u003c\/span\u003e demonstrates a superior level of quality, designed to guarantee \u003cspan class=\"s1\"\u003e\u003cb\u003ereliability, thermal stability and silence\u003c\/b\u003e\u003c\/span\u003e in all operating conditions.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThis is a \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e example, subjected to our \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e testing process and rated \u003cspan class=\"s1\"\u003e\u003cb\u003ea VERY STRONG TEST\u003c\/b\u003e\u003c\/span\u003e , ideal for reference hi-fi applications, professional equipment, sensitive preamplifiers and systems requiring absolute precision and cleanliness.\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\"\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tone is balanced, refined, and coherent. The combination of black plates and Gammatron selection allows for a stable, rich, and defined sound, with superior control across the entire spectrum.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eBass:\u003c\/b\u003e Full-bodied, precise, with excellent depth. Clean and well-controlled lows, ideal for transparent systems requiring detail without bloat.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eMedium:\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e Very natural, fluid, and rich in harmonics. The vocal performance is excellent: rich, believable, and with remarkable timbral realism. Perfect for critical listening.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eHighs:\u003c\/b\u003e Extended, clear, and musical. No harshness, no grain: a bright yet controlled high range, with great air and micro-detail.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eDynamics:\u003c\/b\u003e Responsive and linear. The valve precisely follows both rapid and delicate changes, without compression or sagging. Excellent ability to maintain stability even under load.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eSoundstage:\u003c\/b\u003e Wide, well-layered soundstage, with stable imaging and excellent instrument separation. The halo-getter configuration contributes to an airy, three-dimensional soundstage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003e\u003cspan class=\"s1\"\u003e🎧\u003c\/span\u003e \u003cb\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003ePerfect for high-end tube preamps, line stages, tube-based DACs, integrated amplifiers, and noise-sensitive professional equipment. Its quiet operation makes it ideal for high-efficiency speakers and dedicated listening environments.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cspan class=\"s1\"\u003e🎸\u003c\/span\u003e \u003cb\u003eUse in Music Amplifiers\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eVery effective in boutique guitar preamps, professional rack units, and classic mic preamps. It offers headroom, detail, and a very musical response: tight lows, full mids, and clean highs.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cspan class=\"s1\"\u003e🎯\u003c\/span\u003e \u003cb\u003eNote for audiophiles and technicians\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe Heinz \u0026amp; Kauffman \u003cspan class=\"s2\"\u003e\u003cb\u003e“Gammatron”\u003c\/b\u003e\u003c\/span\u003e series is among the most sought after by enthusiasts of vintage American valves, thanks to the mix of \u003cspan class=\"s2\"\u003e\u003cb\u003eblack plates, halo getters and low noise selection\u003c\/b\u003e\u003c\/span\u003e .\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThis example, tamper-proof packaged to Vacuum Tubes Treasures standards, represents an excellent choice for high-end systems, professional restorations, and collectors of USA-made tubes.\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 = 2000 ; Ia = 9.6 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1900 ; Ia = 9.2 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 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. 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":55987984236892,"sku":"03271","price":3400.0,"currency_code":"ALL","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_7f0b3816-4349-4d1a-96d3-eb3f8270b115.jpg?v=1763325720","url":"https:\/\/vacuumtubestreasures.com\/en-al\/products\/12au7wa-cv4003-6189-heinz-kauffman-black-plates-halo-getter-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}