{"product_id":"jan-5r4wgb-raytheon-matched-pair-black-plates-rectifier-tubes-made-in-usa-67","title":"5R4WGB RAYTHEON Matched Pair – Black Plates Hanging Filaments – Funke W19 Tested USA '67","description":"\u003cp\u003e\u003cstrong\u003eJAN 5R4WGB RAYTHEON Matched Pair Black Plates Double Halo Getter Hanging Filaments Rectifier Tubes Made in USA '67\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"648\" data-start=\"221\"\u003eThe \u003cstrong data-end=\"243\" data-start=\"224\"\u003e5R4WGB RAYTHEON\u003c\/strong\u003e , in this 1967 \u003cstrong data-end=\"289\" data-start=\"264\"\u003eJAN (Joint Army-Navy)\u003c\/strong\u003e version, features a ruggedized military construction, with \u003cstrong data-end=\"375\" data-start=\"350\"\u003esolid black plates\u003c\/strong\u003e , \u003cstrong data-end=\"401\" data-start=\"377\"\u003edual halo getters\u003c\/strong\u003e , \u003cstrong data-end=\"424\" data-start=\"403\"\u003esuspended filaments\u003c\/strong\u003e , and thick “potato masher” style glass. This is one of the most \u003cstrong data-end=\"532\" data-start=\"508\"\u003erugged and reliable\u003c\/strong\u003e rectifiers of the era, designed to \u003cstrong data-end=\"604\" data-start=\"560\"\u003ewithstand extreme operating conditions\u003c\/strong\u003e without compromising electrical stability.\u003c\/p\u003e\n\u003cp data-end=\"928\" data-start=\"650\"\u003eThis \u003cstrong data-end=\"675\" data-start=\"657\"\u003ematched pair\u003c\/strong\u003e guarantees ideal symmetry between the channels, and is suitable for dual mono power supplies, medium power single-ended amplifiers or restorations of military and broadcast electronics, where \u003cstrong data-end=\"917\" data-start=\"867\"\u003ereliability, silence and solidity of tone\u003c\/strong\u003e over time are required.\u003c\/p\u003e\n\u003cp data-end=\"1181\" data-start=\"935\"\u003e\u003cstrong data-end=\"944\" data-start=\"935\"\u003eBass\u003c\/strong\u003e : solid and authoritative. The low range is \u003cstrong data-end=\"1011\" data-start=\"984\"\u003edeep and well anchored\u003c\/strong\u003e , with a behavior that favors \u003cstrong data-end=\"1074\" data-start=\"1049\"\u003econtrolled impact\u003c\/strong\u003e over softness. Ideal for systems that require \u003cstrong data-end=\"1162\" data-start=\"1136\"\u003estability under load\u003c\/strong\u003e and a decisive response.\u003c\/p\u003e\n\u003cp data-end=\"1428\" data-start=\"1183\"\u003e\u003cstrong data-end=\"1191\" data-start=\"1183\"\u003eMids\u003c\/strong\u003e : dry and focused. The mid frequencies are \u003cstrong data-end=\"1288\" data-start=\"1246\"\u003eclean, linear and free from colorations\u003c\/strong\u003e , with a more “technical” than romantic setting. The voices are \u003cstrong data-end=\"1363\" data-start=\"1352\"\u003eprecise\u003c\/strong\u003e , and the acoustic instruments emerge with \u003cstrong data-end=\"1427\" data-start=\"1403\"\u003eclarity and coherence\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cp data-end=\"1665\" data-start=\"1430\"\u003e\u003cstrong data-end=\"1438\" data-start=\"1430\"\u003eHighs\u003c\/strong\u003e : neutral and transparent. The upper part of the spectrum does not introduce any attenuations or exaltations: the detail is \u003cstrong data-end=\"1567\" data-start=\"1551\"\u003ewell present\u003c\/strong\u003e , but never excessive. The brilliance is \u003cstrong data-end=\"1617\" data-start=\"1605\"\u003emeasured\u003c\/strong\u003e , with an \u003cstrong data-end=\"1664\" data-start=\"1632\"\u003eanalytical but not tiring\u003c\/strong\u003e rendering.\u003c\/p\u003e\n\u003cp data-end=\"1930\" data-start=\"1667\"\u003e\u003cstrong data-end=\"1679\" data-start=\"1667\"\u003eDynamics\u003c\/strong\u003e : Reactive and stable. The dynamic behavior is \u003cstrong data-end=\"1765\" data-start=\"1729\"\u003efast but always under control\u003c\/strong\u003e , without hysteresis or perceptible delays. The valve handles sudden variations well, returning a \u003cstrong data-end=\"1900\" data-start=\"1879\"\u003eclean and coherent\u003c\/strong\u003e signal, even with variable loads.\u003c\/p\u003e\n\u003cp data-end=\"2199\" data-start=\"1932\"\u003e\u003cstrong data-end=\"1946\" data-start=\"1932\"\u003eSoundstage\u003c\/strong\u003e : wide and rational. The soundstage is \u003cstrong data-end=\"2015\" data-start=\"1985\"\u003edeep and well distributed\u003c\/strong\u003e , with \u003cstrong data-end=\"2056\" data-start=\"2021\"\u003eexcellent separation between channels\u003c\/strong\u003e and a spatial rendering \u003cstrong data-end=\"2112\" data-start=\"2077\"\u003ethat is more engineered than euphonic\u003c\/strong\u003e . Ideal for those seeking \u003cstrong data-end=\"2198\" data-start=\"2135\"\u003eprecision and transparency in the construction of the soundstage\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cp data-end=\"2723\" data-start=\"2206\"\u003e🎧 \u003cstrong data-end=\"2266\" data-start=\"2209\"\u003eUse in Headphone Amplifiers and Driver Stages Hi-Fi\u003c\/strong\u003e \u003cbr data-end=\"2269\" data-start=\"2266\"\u003eThanks to its \u003cstrong data-end=\"2310\" data-start=\"2285\"\u003eexceptional stability\u003c\/strong\u003e and \u003cstrong data-end=\"2358\" data-start=\"2316\"\u003eextremely low noise floor\u003c\/strong\u003e , this pair is ideal for \u003cstrong data-end=\"2469\" data-start=\"2387\"\u003etube preamplifiers, dual mono DACs and reference headphone amplifiers\u003c\/strong\u003e , especially in systems where \u003cstrong data-end=\"2544\" data-start=\"2504\"\u003etimbral accuracy and resolution\u003c\/strong\u003e are fundamental criteria. It pairs perfectly with headphones such as \u003cstrong data-end=\"2630\" data-start=\"2611\"\u003ethe Hifiman Susvara\u003c\/strong\u003e , \u003cstrong data-end=\"2648\" data-start=\"2632\"\u003eFocal Utopia\u003c\/strong\u003e or \u003cstrong data-end=\"2672\" data-start=\"2651\"\u003eSennheiser HD800S\u003c\/strong\u003e , enhancing their neutral and transparent character.\u003c\/p\u003e\n\u003cp data-end=\"3154\" data-start=\"2725\"\u003e🎸 \u003cstrong data-end=\"2773\" data-start=\"2728\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e \u003cbr data-end=\"2776\" data-start=\"2773\"\u003eThe 5R4WGB is often used in \u003cstrong data-end=\"2847\" data-start=\"2809\"\u003ehigh-grade American amplifiers\u003c\/strong\u003e or \u003cstrong data-end=\"2897\" data-start=\"2853\"\u003eboutique military-spec models\u003c\/strong\u003e , where it offers \u003cstrong data-end=\"2994\" data-start=\"2910\"\u003etight rectification, crisp attack, and stable response under stress\u003c\/strong\u003e . Ideal for articulate clean sounds, jazz, country, and high-fidelity studio recording. Less suitable for those looking for tube-like compression and pronounced sag.\u003c\/p\u003e\n\u003cp data-end=\"3599\" data-start=\"3156\"\u003e🎯 \u003cstrong data-end=\"3191\" data-start=\"3159\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e \u003cbr data-end=\"3194\" data-start=\"3191\"\u003eA \u003cstrong data-end=\"3241\" data-start=\"3213\"\u003etechnically flawless\u003c\/strong\u003e rectifier, designed to last for decades. The \u003cstrong data-end=\"3301\" data-start=\"3285\"\u003eJAN RAYTHEON\u003c\/strong\u003e brand, the presence of \u003cstrong data-end=\"3340\" data-start=\"3319\"\u003esuspended filaments\u003c\/strong\u003e and the symmetrical internal construction make it an excellent choice for \u003cstrong data-end=\"3502\" data-start=\"3412\"\u003ethose who favor electrical rigor, symmetry between channels and reliability over the long term\u003c\/strong\u003e . The \u003cstrong data-end=\"3532\" data-start=\"3516\"\u003ematched pair\u003c\/strong\u003e version represents an added value in dual mono or balanced contexts.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5.0V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eGood from:\u003c\/strong\u003e Ia = 61 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 95 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\u003cspan\u003e \u003c\/span\u003eIa = 110 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 105 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\u003cspan\u003e \u003c\/span\u003eIa = 110 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 100 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\u003cmeta charset=\"utf-8\"\u003e Standard. Tested and compliant for use in hi-fi and guitar amplifiers.\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 Tubes - Tested and in perfect working order. Supplied in our custom box for optimum 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\u003eAesthetic Condition:\u003c\/strong\u003e Very Good – Clearly legible writing with slight signs of aging. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 67-33 and 67-26 -\u003cmeta charset=\"utf-8\"\u003e Built in the 33rd and 26th week of 1967 respectively.\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":"RAYTHEON","offers":[{"title":"Default Title","offer_id":54764417679708,"sku":"02973L","price":84.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_3313cc4e-403b-423d-959e-f3959bb69363.jpg?v=1750085724","url":"https:\/\/vacuumtubestreasures.com\/en-lu\/products\/jan-5r4wgb-raytheon-matched-pair-black-plates-rectifier-tubes-made-in-usa-67","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}