{"product_id":"12at7-wa-e81cc-sylvania-nos-3-mica-gray-wing-plates-square-tilt-getter-tested-tube-made-in-usa-47-copia","title":"12AT7 ECC81 NOS Sylvania – Black Wing Plates Square Getter Pair Tubes USA 1949","description":"\u003cp\u003e\u003cstrong\u003e12AT7 ( ECC81 ) SYLVANIA NOS Black Wing Plates Square Tilt Getter Tested Pair Tubes Made in USA '49\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"905\" data-start=\"397\"\u003eThe \u003cstrong data-end=\"418\" data-start=\"400\"\u003e12AT7 SYLVANIA\u003c\/strong\u003e , in the \u003cstrong data-end=\"504\" data-start=\"445\"\u003eblack wing plates\u003c\/strong\u003e and \u003cstrong data-end=\"541\" data-start=\"507\"\u003esquare tilt getter\u003c\/strong\u003e configuration, represents one of the most interesting expressions of American production in the late 1940s. This \u003cstrong data-end=\"699\" data-start=\"646\"\u003eNOS pair, electrically tested but not matched\u003c\/strong\u003e , offers a clear, lively and well-controlled timbre, with a sound setting that favors \u003cstrong data-end=\"848\" data-start=\"796\"\u003etransparency, articulation and dynamic reactivity\u003c\/strong\u003e , while maintaining good musical coherence.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1118\" data-start=\"907\"\u003e\u003cstrong data-end=\"916\" data-start=\"907\"\u003eBass\u003c\/strong\u003e : fast, dry and well defined. The bass is present without excess, with a tense and rhythmic response, ideal for systems that require articulation and control, without the need for additional euphony.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1335\" data-start=\"1120\"\u003e\u003cstrong data-end=\"1128\" data-start=\"1120\"\u003eMids\u003c\/strong\u003e : bright, direct and clean. Voices are well focused, with a clear and slightly analytical rendering, without ever becoming dry. Acoustic instruments emerge with energy and good separation.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1538\" data-start=\"1337\"\u003e\u003cstrong data-end=\"1345\" data-start=\"1337\"\u003eHighs\u003c\/strong\u003e : airy and precise, with a controlled brilliance. The high range develops without harshness, always maintaining a transparent, refined character and well integrated with the rest of the spectrum.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1766\" data-start=\"1540\"\u003e\u003cstrong data-end=\"1552\" data-start=\"1540\"\u003eDynamics\u003c\/strong\u003e : very reactive and proportionate. The valve promptly follows the variations of the signal, returning microdetails and nuances without stiffening. The effect is that of a response that is always ready, but musical.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2008\" data-start=\"1768\"\u003e\u003cstrong data-end=\"1782\" data-start=\"1768\"\u003eSoundstage\u003c\/strong\u003e : Focused, uncluttered and coherent. The stereo image develops clearly, with good lateral separation and a well-defined centre, offering a credible soundstage, although not as wide as that of more euphonic valves.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2292\" data-start=\"2010\"\u003eThe \u003cstrong data-end=\"2070\" data-start=\"2013\"\u003epair of 12AT7 SYLVANIA black wing plates – USA 1949\u003c\/strong\u003e , although not matched, presents itself as a \u003cstrong data-end=\"2159\" data-start=\"2119\"\u003equality technical and musical choice\u003c\/strong\u003e , suitable for those looking for a \u003cstrong data-end=\"2236\" data-start=\"2190\"\u003efast, open and coloration-free voice\u003c\/strong\u003e , both in hi-fi applications and in the professional field.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2354\" data-start=\"2294\"\u003e🎧 \u003cstrong data-end=\"2354\" data-start=\"2297\"\u003eUse in Headphone Amplifiers and Driver Stages Hi-Fi\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2774\" data-start=\"2356\"\u003eThis tube is well suited to \u003cstrong data-end=\"2451\" data-start=\"2388\"\u003etransparent, low distortion, high resolution systems\u003c\/strong\u003e , where \u003cstrong data-end=\"2511\" data-start=\"2474\"\u003efaithful detail reproduction\u003c\/strong\u003e and a \u003cstrong data-end=\"2547\" data-start=\"2518\"\u003ewell-readable midrange\u003c\/strong\u003e are required. In headphone amplifiers such as \u003cstrong data-end=\"2597\" data-start=\"2582\"\u003eFeliks Echo\u003c\/strong\u003e , \u003cstrong data-end=\"2613\" data-start=\"2599\"\u003eSchiit Lyr\u003c\/strong\u003e , or in tube preamplifiers, the \u003cstrong data-end=\"2669\" data-start=\"2651\"\u003e12AT7 SYLVANIA\u003c\/strong\u003e allows for \u003cstrong data-end=\"2737\" data-start=\"2696\"\u003eclear, controlled, and non-fatiguing\u003c\/strong\u003e reproduction, with a precise and articulated soundstage.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2824\" data-start=\"2776\"\u003e🎸 \u003cstrong data-end=\"2824\" data-start=\"2779\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3340\" data-start=\"2826\"\u003eAlso popular in \u003cstrong data-end=\"2882\" data-start=\"2852\"\u003eguitar amplifiers\u003c\/strong\u003e , this \u003cstrong data-end=\"2908\" data-start=\"2891\"\u003evintage 12AT7\u003c\/strong\u003e is often used as \u003cstrong data-end=\"2950\" data-start=\"2934\"\u003ea driver stage\u003c\/strong\u003e or \u003cstrong data-end=\"2971\" data-start=\"2953\"\u003ephase inverter\u003c\/strong\u003e in models such as \u003cstrong data-end=\"3012\" data-start=\"2988\"\u003ethe Fender Deluxe Reverb\u003c\/strong\u003e , \u003cstrong data-end=\"3029\" data-start=\"3014\"\u003eTwin Reverb\u003c\/strong\u003e and in blackface-style boutique amplifiers. It offers \u003cstrong data-end=\"3148\" data-start=\"3084\"\u003ehigh headroom, defined attack and progressive saturation\u003c\/strong\u003e , particularly useful for those looking for a \u003cstrong data-end=\"3228\" data-start=\"3189\"\u003eclean, articulate and musical sound\u003c\/strong\u003e . Even in tube bass amps, it guarantees a controlled low end and a quick response under load.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3617\" data-start=\"3342\"\u003e🎯 \u003cstrong data-end=\"3371\" data-start=\"3345\"\u003eNote for audiophiles\u003c\/strong\u003e : \u003cbr data-end=\"3375\" data-start=\"3372\"\u003eA \u003cstrong data-end=\"3454\" data-start=\"3387\"\u003esober, transparent tube with a very natural dynamic behavior\u003c\/strong\u003e , ideal for those who want a \u003cstrong data-end=\"3532\" data-start=\"3484\"\u003eneutral but engaging timbre restitution\u003c\/strong\u003e , without excesses or forced colorations. Also excellent for comparisons and system tests.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on AMPLITREX AT-1000 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -2V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Gm = 5.5 ; Ia = 10.0 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\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 6.5 ; Ia = 14.9 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 6.4 ; Ia = 13.5 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 5.5 ; Ia = 10.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 5.6 ; Ia = 11.8 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low – Tested and rated for use in hi-fi systems and guitar amplifiers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003cbr\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\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 NOS - New Old Stock - Tested and fully functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e See photos for details.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 913 - produced 13th week of 1949\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":54521044173148,"sku":"02918","price":128000.0,"currency_code":"KRW","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_d4057429-1526-49c1-9b7d-adbc74511abb.jpg?v=1747239121","url":"https:\/\/vacuumtubestreasures.com\/en-kr\/products\/12at7-wa-e81cc-sylvania-nos-3-mica-gray-wing-plates-square-tilt-getter-tested-tube-made-in-usa-47-copia","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}