{"product_id":"el84-6bq5-sylvania-for-baldwin-gray-plates-matched-tubes-made-in-usa-56","title":"EL84 6BQ5 Baldwin\/SYLVANIA Matched Quad Gray Plates Halo Getter Tubes Made in USA '55","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e\u003cstrong\u003eEL84 ( 6BQ5 ) Baldwin\/SYLVANIA Matched Quad Gray Plates Halo Getter Tubes Made in USA '55\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1197\" data-start=\"454\"\u003eThis matched quartet of \u003cstrong data-end=\"519\" data-start=\"508\"\u003eBaldwin\u003c\/strong\u003e branded \u003cstrong data-end=\"497\" data-start=\"482\"\u003eEL84 (6BQ5)\u003c\/strong\u003e tubes produced by \u003cstrong data-end=\"559\" data-start=\"534\"\u003eSylvania USA in 1955\u003c\/strong\u003e represents one of the finest examples of post-war American production.\u003cbr data-end=\"647\" data-start=\"644\"\u003eThe construction with \u003cstrong data-end=\"681\" data-start=\"666\"\u003egray plates\u003c\/strong\u003e , \u003cstrong data-end=\"717\" data-start=\"683\"\u003ering getter (Halo Getter)\u003c\/strong\u003e and compact frame with black base offers an exemplary combination of \u003cstrong data-end=\"844\" data-start=\"789\"\u003erobustness, tonal balance and dynamic precision\u003c\/strong\u003e . \u003cbr data-end=\"848\" data-start=\"845\"\u003eBaldwin\/Sylvania tubes were selected for use in professional audio equipment and high-end electric organs, where \u003cstrong data-end=\"1059\" data-start=\"1005\"\u003elow microphonics and absolute electrical stability\u003c\/strong\u003e were required.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-end=\"1232\" data-start=\"1204\"\u003e\u003cstrong data-end=\"1232\" data-start=\"1206\"\u003eSound Characteristics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1363\" data-start=\"1236\"\u003e\u003cstrong data-end=\"1246\" data-start=\"1236\"\u003eBass:\u003c\/strong\u003e solid and controlled, with excellent anchoring in the mid-low register; no tendency towards emphasis or resonance.\u003c\/li\u003e\n\u003cli data-end=\"1470\" data-start=\"1366\"\u003e\u003cstrong data-end=\"1375\" data-start=\"1366\"\u003eMids:\u003c\/strong\u003e Authentic and full-bodied, with natural timbre and realistic presence of vocals and acoustic instruments.\u003c\/li\u003e\n\u003cli data-end=\"1573\" data-start=\"1473\"\u003e\u003cstrong data-end=\"1482\" data-start=\"1473\"\u003eHighs:\u003c\/strong\u003e extended but never aggressive, with a refined brilliance typical of 1950s Sylvanias.\u003c\/li\u003e\n\u003cli data-end=\"1686\" data-start=\"1576\"\u003e\u003cstrong data-end=\"1589\" data-start=\"1576\"\u003eDynamics:\u003c\/strong\u003e responsive and well-proportioned; excellent microcontrast that enhances detail without being harsh.\u003c\/li\u003e\n\u003cli data-end=\"1829\" data-start=\"1689\"\u003e\u003cstrong data-end=\"1704\" data-start=\"1689\"\u003eSoundstage:\u003c\/strong\u003e Wide and deep, with stable and coherent imaging; it delivers a sense of three-dimensional realism that is rare in modern EL84s.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1869\" data-start=\"1836\"\u003e🎧 \u003cstrong data-end=\"1869\" data-start=\"1839\"\u003eUse in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"2279\" data-start=\"1871\"\u003eIdeal for high-end \u003cstrong data-end=\"1909\" data-start=\"1896\"\u003epush-pull\u003c\/strong\u003e or \u003cstrong data-end=\"1928\" data-start=\"1912\"\u003esingle-ended\u003c\/strong\u003e amplifiers, these Baldwin\/Sylvania EL84s deliver \u003cstrong data-end=\"2016\" data-start=\"1984\"\u003esmooth, natural musicality\u003c\/strong\u003e while maintaining \u003cstrong data-end=\"2076\" data-start=\"2029\"\u003equiet operation and tonal accuracy\u003c\/strong\u003e .\u003cbr data-end=\"2080\" data-start=\"2077\"\u003ePerfect in vintage American or European gear (Dynaco, Eico, Leak, Fisher), they deliver a balanced, effortless sonic presentation, with an extraordinarily natural and transparent midrange.\u003c\/p\u003e\n\u003cp data-end=\"2322\" data-start=\"2286\"\u003e🎸 \u003cstrong data-end=\"2322\" data-start=\"2289\"\u003eUse in Music Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"2778\" data-start=\"2324\"\u003eIn the musical field, they offer a \u003cstrong data-end=\"2388\" data-start=\"2361\"\u003eharmonious, warm and full\u003c\/strong\u003e sound, with generous headroom and constant dynamic response even under load.\u003cbr data-end=\"2463\" data-start=\"2460\"\u003eParticularly suitable for \u003cstrong data-end=\"2523\" data-start=\"2506\"\u003eVox AC15\/AC30\u003c\/strong\u003e , \u003cstrong data-end=\"2541\" data-start=\"2525\"\u003eMarshall 18W\u003c\/strong\u003e , \u003cstrong data-end=\"2556\" data-start=\"2543\"\u003eMatchless\u003c\/strong\u003e amplifiers, or boutique replicas, where their \u003cstrong data-end=\"2618\" data-start=\"2592\"\u003eAmerican sound texture\u003c\/strong\u003e provides body, sustain and definition in the harmonics.\u003cbr data-end=\"2678\" data-start=\"2675\"\u003eThe low background noise also makes them excellent for \u003cstrong data-end=\"2753\" data-start=\"2733\"\u003estudio recording\u003c\/strong\u003e and \u003cstrong data-end=\"2777\" data-start=\"2756\"\u003eprofessional use\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cp data-end=\"2820\" data-start=\"2785\"\u003e🎯 \u003cstrong data-end=\"2820\" data-start=\"2788\"\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\u003cstrong data-end=\"2869\" data-start=\"2824\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"3312\" data-start=\"3183\"\u003eA quartet with a \u003cstrong data-end=\"3238\" data-start=\"3210\"\u003enoble, warm and natural\u003c\/strong\u003e character, capable of combining \u003cstrong data-end=\"3311\" data-start=\"3260\"\u003etimbre precision and authentic vintage charm\u003c\/strong\u003e .\u003c\/p\u003e\n\u003chr data-end=\"3317\" data-start=\"3314\"\u003e\n\u003cp data-end=\"3344\" data-start=\"3319\"\u003e\u003cstrong data-end=\"3344\" data-start=\"3322\"\u003eTest Results\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"3542\" data-start=\"3346\"\u003eValves tested on \u003cstrong data-end=\"3398\" data-start=\"3365\"\u003eAmplitrex AT-1000\u003c\/strong\u003e Tube Tester\u003cbr data-end=\"3401\" data-start=\"3398\"\u003e\u003cstrong data-end=\"3424\" data-start=\"3401\"\u003eTest conditions:\u003c\/strong\u003e Va = 250 V, Vg = –8 V\u003cbr data-end=\"3449\" data-start=\"3446\"\u003e\u003cstrong data-end=\"3471\" data-start=\"3449\"\u003e100% average value:\u003c\/strong\u003e Gm = 11.3 ; Ia = 48 mA\u003cbr data-end=\"3502\" data-start=\"3499\"\u003e\u003cstrong data-end=\"3528\" data-start=\"3502\"\u003eTest Result:\u003c\/strong\u003e STRONG\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e Gm = 9.6 ; Ia = 41.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eValve 2:\u003c\/strong\u003e Gm = 10.2 ; Ia = 42.6 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eValve 3:\u003c\/strong\u003e Gm = 9.8 ; Ia = 39.2 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eValve 4:\u003c\/strong\u003e Gm = 9.8 ; Ia = 38.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Strong and stable output, no fluctuations.\u003cstrongr\u003e\u003c\/strongr\u003e\u003c\/li\u003e\n\u003cli\u003eShort circuits and GAS: Absent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"3871\" data-start=\"3868\"\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e \u003cspan\u003eVintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003c\/span\u003e\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\u003eAesthetic condition:\u003c\/strong\u003e \u003cspan\u003eVery good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003e312 526 → 312 indicates the manufacturer, i.e. Sylvania Electric Products Inc., Emporium, Pa. - 526 → 5 (out of three digits) → 1955 - 26 → 26th week of the year\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":42983318323447,"sku":"00697","price":129.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_23c984be-7a0d-4078-a472-952cb470926d.jpg?v=1760471063","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/el84-6bq5-sylvania-for-baldwin-gray-plates-matched-tubes-made-in-usa-56-en","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}