{"product_id":"5u4gb-5as4a-nos-nib-toshiba-international-black-plates-matched-pair-tubes-top-side-dual-disc-getter-rectifiers-made-in-japan","title":"5U4GB 5AS4A NOS NIB International by TOSHIBA Black Plates Tube Top Side Dual Disc Getter Rectifier Made in JAPAN","description":"\u003cp\u003e \u003cstrong\u003e5U4GB 5AS4A NOS NIB International by\u003cmeta charset=\"utf-8\"\u003e TOSHIBA Black Plates Tube Top Side Dual Disc Getter Rectifier Made in JAPAN\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eNote: Price refers to one selected valve\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003e Description:\u003c\/h3\u003e\n\n\u003cp data-start=\"410\" data-end=\"944\"\u003e The \u003cstrong data-start=\"456\" data-end=\"473\"\u003e5U4GB \/ 5AS4A\u003c\/strong\u003e , manufactured in Japan by \u003cstrong data-start=\"499\" data-end=\"510\"\u003eToshiba\u003c\/strong\u003e and distributed under the \u003cem data-start=\"537\" data-end=\"552\"\u003eInternational\u003c\/em\u003e brand, is offered in \u003cstrong data-start=\"577\" data-end=\"616\"\u003eNOS NIB (New Old Stock, New in Box)\u003c\/strong\u003e condition. \u003cbr data-start=\"617\" data-end=\"620\"\u003eThis tube features \u003cstrong data-start=\"646\" data-end=\"662\"\u003eblack plates\u003c\/strong\u003e and a unique \u003cstrong data-start=\"691\" data-end=\"734\"\u003edual-disc getter system in the upper position\u003c\/strong\u003e , a typical feature of high-quality Japanese production of the time. It represents a highly reliable and consistent choice for high-end audio applications.\u003c\/p\u003e\n\n\u003ch3 data-start=\"946\" data-end=\"993\"\u003e Timbre and performance characteristics\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli data-start=\"996\" data-end=\"1063\"\u003e\n\n \u003cstrong data-start=\"996\" data-end=\"1005\"\u003eBass\u003c\/strong\u003e : tight and compact, with excellent articulation and control.\u003c\/li\u003e\n\n\u003cli data-start=\"1066\" data-end=\"1145\"\u003e\n\n \u003cstrong data-start=\"1066\" data-end=\"1074\"\u003eMids\u003c\/strong\u003e : clear and transparent, with voices and instruments rendered with realism.\u003c\/li\u003e\n\n\u003cli data-start=\"1148\" data-end=\"1218\"\u003e\n\n \u003cstrong data-start=\"1148\" data-end=\"1156\"\u003eHighs\u003c\/strong\u003e : bright and refined, never aggressive, with fine detail.\u003c\/li\u003e\n\n\u003cli data-start=\"1221\" data-end=\"1305\"\u003e\n\n \u003cstrong data-start=\"1221\" data-end=\"1233\"\u003eDynamics\u003c\/strong\u003e : stable and proportionate, with constant power delivery even under load.\u003c\/li\u003e\n\n\u003cli data-start=\"1308\" data-end=\"1384\"\u003e\n\n \u003cstrong data-start=\"1308\" data-end=\"1322\"\u003eSoundstage\u003c\/strong\u003e : tidy, stable and precise, with a coherent sound image.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003ch3 data-start=\"1386\" data-end=\"1677\"\u003e🎧 Use in Hi-Fi Stereo Amplifiers\u003c\/h3\u003e\n\n\u003cp data-start=\"1386\" data-end=\"1677\"\u003e Ideal as the main rectifier in reference hi-fi amplifiers (McIntosh, Dynaco, Audio Research, Conrad Johnson and similar), it offers silent and linear power supply, with excellent tonal coherence and great reliability over time.\u003c\/p\u003e\n\n\u003ch3 data-start=\"1679\" data-end=\"1891\"\u003e 🎸 Use in Music Amplifiers\u003c\/h3\u003e\n\n\u003cp data-start=\"1679\" data-end=\"1891\"\u003e In tube guitar amplifiers, the Toshiba 5U4GB delivers natural sustain, snappy response, and a warm harmonic tone—perfect for blues, jazz, and classic rock.\u003c\/p\u003e\n\n\u003ch3 data-start=\"1893\" data-end=\"2222\"\u003e 🎯 Note for audiophiles and technicians\u003c\/h3\u003e\n\n\u003cp data-start=\"1893\" data-end=\"2222\"\u003e This \u003cstrong data-start=\"1938\" data-end=\"2011\"\u003e5U4GB \/ 5AS4A Toshiba Black Plates Dual Disc Getter\u003c\/strong\u003e , in \u003cstrong data-start=\"2027\" data-end=\"2038\"\u003eNOS NIB\u003c\/strong\u003e condition, represents a rare and valuable solution for those who want stable, long-lasting rectification with a refined sonic character, both in hi-fi and vintage music applications.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e \u003cstrong\u003eTubes Tested\u003c\/strong\u003e on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\n \u003cp\u003e\u003cstrong\u003eVoltage Test:\u003c\/strong\u003e Va = 100V, Vf = 5V \u003cstrong\u003e\u003cbr\u003eGood from:\u003c\/strong\u003e Ia = 78 mA \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003c\/strong\u003e Ia = 120 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve 1\u003c\/strong\u003e :\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Ia = 132 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Ia = 133 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve 2\u003c\/strong\u003e :\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Ia = 135 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Ia = 130 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eOperation:\u003c\/strong\u003e Stable valve, quiet in operation, and suitable for regular and controlled power supply. Tested with a Funke W19 tester.\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e \u003cbr\u003e\n\u003c\/strong\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\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\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eUnreadable – Made by TOSHIBA JAPAN, identifiable by its construction features. 1970s\u003cmeta charset=\"utf-8\"\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\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":"INTERNATIONAL","offers":[{"title":"Default Title","offer_id":55591941308764,"sku":"03171","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/14_e2f2b8d3-9656-4965-8c99-99c3349c8355.jpg?v=1769277477","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/5u4gb-5as4a-nos-nib-toshiba-international-black-plates-matched-pair-tubes-top-side-dual-disc-getter-rectifiers-made-in-japan","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}