{"product_id":"5814a-12au7-sylvania-gold-brand-triple-mica-red-tip-square-getter-made-in-usa","title":"5814A \/ 12AU7 Sylvania Gold Brand Triple Mica Red Tip Square Getter Made in USA","description":"\u003cp\u003e\u003cstrong\u003e5814A \/ 12AU7 Sylvania Gold Brand Triple Mica Red Tip Square Getter Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUltra Low Noise \u0026amp; Microphonics –\u003cmeta charset=\"utf-8\"\u003e Premium Gold Brand Version – Very Rare\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"768\" data-start=\"373\"\u003eThe \u003cstrong data-end=\"405\" data-start=\"376\"\u003e5814A Sylvania Gold Brand\u003c\/strong\u003e represents the maximum expression of American construction quality applied to the 12AU7 family.\u003cbr data-end=\"516\" data-start=\"513\"\u003eManufactured in the USA for \u003cstrong data-end=\"610\" data-start=\"556\"\u003emilitary, broadcast and professional instrumentation\u003c\/strong\u003e applications, the \u003cem data-end=\"633\" data-start=\"621\"\u003eGold Brand\u003c\/em\u003e series was Sylvania's “top grade” line, subjected to extremely rigorous selection criteria for stability and noise.\u003c\/p\u003e\n\u003cp data-end=\"1248\" data-start=\"770\"\u003eThis version is distinguished by its \u003cstrong data-end=\"846\" data-start=\"806\"\u003etriple mica construction (Triple Mica)\u003c\/strong\u003e , introduced to reduce microphonics and increase mechanical resistance, and by the characteristic \u003cstrong data-end=\"960\" data-start=\"949\"\u003eRed Tip\u003c\/strong\u003e , a factory marking used by Sylvania to indicate \u003cstrong data-end=\"1076\" data-start=\"1032\"\u003elow-noise and controlled microphonics\u003c\/strong\u003e specimens.\u003cbr data-end=\"1080\" data-start=\"1077\"\u003eThe \u003cstrong data-end=\"1115\" data-start=\"1083\"\u003egray plates\u003c\/strong\u003e and the \u003cstrong data-end=\"1140\" data-start=\"1121\"\u003esquare getter\u003c\/strong\u003e ensure stable thermal behavior and a neutral yet refined sound, with a long operating life.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"361\" data-end=\"606\"\u003e\u003cstrong data-start=\"361\" data-end=\"371\"\u003eBass:\u003c\/strong\u003e\u003cbr data-start=\"371\" data-end=\"374\"\u003eBold and deep, yet always controlled. The bass response is solid, never intrusive, with a well-anchored harmonic structure free from excess. Excellent hold in the low registers, even with highly dynamic amplifiers.\u003c\/li\u003e\n\u003cli data-start=\"608\" data-end=\"886\"\u003e\u003cstrong data-start=\"608\" data-end=\"617\"\u003eMedium:\u003c\/strong\u003e\u003cbr data-start=\"617\" data-end=\"620\"\u003eClean, coherent, and beautifully balanced. Vocals emerge with naturalness and realistic presence, while pianos, guitars, and acoustic instruments display body and rich harmonics. It's a \"studio\" midrange, dense yet transparent, typical of the best Gold Brands.\u003c\/li\u003e\n\u003cli data-start=\"888\" data-end=\"1098\"\u003e\u003cstrong data-start=\"888\" data-end=\"897\"\u003eHighs:\u003c\/strong\u003e\u003cbr data-start=\"897\" data-end=\"900\"\u003eExtensive and refined, with a touch of sweetness that avoids any listening fatigue. The high frequencies are detailed, but never sharp: they convey micro-information and ambience with extreme elegance.\u003c\/li\u003e\n\u003cli data-start=\"1100\" data-end=\"1313\"\u003e\u003cstrong data-start=\"1100\" data-end=\"1113\"\u003eDynamics:\u003c\/strong\u003e\u003cbr data-start=\"1113\" data-end=\"1116\"\u003eResponsive and fluid. The transient response is precise yet natural, with microcontrast and perfectly discernible nuances. Ideal for high-resolution systems or reference amplification.\u003c\/li\u003e\n\u003cli data-start=\"1315\" data-end=\"1642\"\u003e\u003cstrong data-start=\"1315\" data-end=\"1330\"\u003eSoundstage:\u003c\/strong\u003e \u003cbr data-start=\"1330\" data-end=\"1333\"\u003eWide, airy, and stable. The soundstage opens up with realistic depth, with well-defined instrument positioning and uniform timbre across channels. The \u003cstrong data-start=\"1507\" data-end=\"1522\"\u003etriple mica\u003c\/strong\u003e structure contributes to extraordinary stability and low background noise, enhancing the perception of space and silence.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1884\" data-end=\"1924\"\u003e🎧 Use in Hi-Fi Stereo Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1926\" data-end=\"2236\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e Perfect for line preamplifiers, driver stages, and high-end integrated amplifiers, the \u003cstrong data-start=\"1777\" data-end=\"1806\"\u003eSylvania Gold Brand 5814A\u003c\/strong\u003e stands out for \u003cstrong data-start=\"1824\" data-end=\"1883\"\u003eits transparency, natural timbre, and lack of microphony\u003c\/strong\u003e , making it ideal for audio chains requiring neutrality and absolute refinement.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"2243\" data-end=\"2293\"\u003e🎸 Use in Musical Instrument Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"2295\" data-end=\"2559\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003eAlso popular in recording studios and boutique amplifiers, where it offers \u003cstrong data-start=\"2097\" data-end=\"2133\"\u003eultra-low noise and full tone\u003c\/strong\u003e , with a natural harmonic progression. Perfect for high-grade projects or audio mastering, where balance and precision are essential.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"2566\" data-end=\"2601\"\u003e🎯 Note for audiophiles and technicians\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"2319\" data-end=\"2449\"\u003e\u003cstrong data-start=\"2319\" data-end=\"2339\"\u003eGold Brand Series\u003c\/strong\u003e – Sylvania's military\/professional grade selection, with individual noise and microphony controls\u003c\/li\u003e\n\u003cli data-start=\"2452\" data-end=\"2542\"\u003e\u003cstrong data-start=\"2452\" data-end=\"2480\"\u003eTriple Mica Construction\u003c\/strong\u003e – maximum mechanical stability and vibration isolation\u003c\/li\u003e\n\u003cli data-start=\"2545\" data-end=\"2609\"\u003e\u003cstrong data-start=\"2545\" data-end=\"2556\"\u003eRed Tip\u003c\/strong\u003e – Factory “Low Noise” selection indication\u003c\/li\u003e\n\u003cli data-start=\"2612\" data-end=\"2684\"\u003e\u003cstrong data-start=\"2612\" data-end=\"2629\"\u003eSquare Getter\u003c\/strong\u003e – guarantee of stable vacuum and long operating life\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e💎 \u003cstrong data-start=\"2787\" data-end=\"2960\" data-is-last-node=\"\"\u003e5814A SYLVANIA GOLD BRAND – American sonic elegance, absolute balance between neutrality, body and detail.\u003cbr data-start=\"2898\" data-end=\"2901\"\u003eOne of the best “premium” interpretations of 12AU7.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube 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 VERY 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 = 2100 ; Ia = 9.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1900 ; 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\u003cmeta charset=\"utf-8\"\u003e Low. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections show a slight deviation in values; excellent for use in hi-fi and musical applications (guitar) where balanced sections are not specifically required.\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\u003eCondition:\u003c\/strong\u003e Vintage - Tested and working - Comes 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 Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e absent – made by SYLVANIA USA, identifiable by construction features.\u003cmeta charset=\"utf-8\"\u003e late 1950s \/ early 1960s\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=\"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":"SYLVANIA","offers":[{"title":"Default Title","offer_id":55952440000860,"sku":"03263","price":54.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_5f2488c5-caea-40a6-81f6-e53ba6e59013.jpg?v=1762980447","url":"https:\/\/vacuumtubestreasures.com\/en-mt\/products\/5814a-12au7-sylvania-gold-brand-triple-mica-red-tip-square-getter-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}