{"product_id":"5y4-g-nu-national-union-black-plates-foil-getter-rectifier-made-in-usa","title":"5Y4G NOS NIB NU National Union – Black Plates Foil Getter Rectifier Tube USA 1950s","description":"\u003cp\u003e\u003cstrong\u003e5Y4 G NU NATIONAL UNION NOS NIB Black Plates Foil Getter Rectifier Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"742\" data-start=\"208\"\u003eThe \u003cstrong data-end=\"234\" data-start=\"211\"\u003e5Y4G National Union\u003c\/strong\u003e , in this rare \u003cstrong data-end=\"271\" data-start=\"260\"\u003eNOS NIB\u003c\/strong\u003e version from the 1950s with \u003cstrong data-end=\"319\" data-start=\"301\"\u003eST bottle\u003c\/strong\u003e structure, compact \u003cstrong data-end=\"337\" data-start=\"321\"\u003eblack plates\u003c\/strong\u003e and \u003cstrong data-end=\"381\" data-start=\"349\"\u003edisc getter (foil getter)\u003c\/strong\u003e , is a \u003cstrong data-end=\"448\" data-start=\"428\"\u003elow current\u003c\/strong\u003e direct-heated rectifier, electrically similar to the 5Y3G but with a different pinout. Made in the United States by \u003cstrong data-end=\"549\" data-start=\"543\"\u003eNU\u003c\/strong\u003e , a company known for the quality of its industrial and military tubes, it represents a choice of \u003cstrong data-end=\"675\" data-start=\"647\"\u003egreat tonal coherence\u003c\/strong\u003e for audio systems with a vintage character or for philological restorations.\u003c\/p\u003e\n\u003cp data-end=\"1027\" data-start=\"744\"\u003eThis valve is distinguished by its \u003cstrong data-end=\"812\" data-start=\"783\"\u003eprogressive behavior\u003c\/strong\u003e , \u003cstrong data-end=\"840\" data-start=\"817\"\u003erobust construction\u003c\/strong\u003e and \u003cstrong data-end=\"870\" data-start=\"846\"\u003erelaxed musicality\u003c\/strong\u003e , particularly appreciated in \u003cstrong data-end=\"948\" data-start=\"902\"\u003elow-power single-ended amplifiers\u003c\/strong\u003e , valve preamplifiers and power supplies of vintage hi-fi radios.\u003c\/p\u003e\n\u003cp data-end=\"1262\" data-start=\"1034\"\u003e\u003cstrong data-end=\"1043\" data-start=\"1034\"\u003eBass\u003c\/strong\u003e : soft and controlled. The low range is \u003cstrong data-end=\"1113\" data-start=\"1085\"\u003emore rounded than deep\u003c\/strong\u003e , with excellent integration into the overall musical message. Where authority is needed, it offers \u003cstrong data-end=\"1246\" data-start=\"1213\"\u003estable and harmonious pulsation\u003c\/strong\u003e , never intrusive.\u003c\/p\u003e\n\u003cp data-end=\"1521\" data-start=\"1264\"\u003e\u003cstrong data-end=\"1272\" data-start=\"1264\"\u003eMids\u003c\/strong\u003e : natural and musical. The mids are \u003cstrong data-end=\"1338\" data-start=\"1319\"\u003efluid and sober\u003c\/strong\u003e , with \u003cstrong data-end=\"1376\" data-start=\"1344\"\u003ea well-articulated central voice\u003c\/strong\u003e and a sonic presence that favors \u003cstrong data-end=\"1443\" data-start=\"1413\"\u003ecoherence and organicity\u003c\/strong\u003e over analyticity. Excellent performance with acoustic instruments and male voices.\u003c\/p\u003e\n\u003cp data-end=\"1777\" data-start=\"1523\"\u003e\u003cstrong data-end=\"1531\" data-start=\"1523\"\u003eHighs\u003c\/strong\u003e : delicate and velvety. The high range is \u003cstrong data-end=\"1581\" data-start=\"1571\"\u003esilky\u003c\/strong\u003e , with a \u003cstrong data-end=\"1619\" data-start=\"1591\"\u003econtrolled brilliance\u003c\/strong\u003e and free from harshness. The details emerge \u003cstrong data-end=\"1688\" data-start=\"1665\"\u003egradually and gracefully\u003c\/strong\u003e , without ever exceeding in definition, contributing to a soft and engaging listening experience.\u003c\/p\u003e\n\u003cp data-end=\"2037\" data-start=\"1779\"\u003e\u003cstrong data-end=\"1791\" data-start=\"1779\"\u003eDynamics\u003c\/strong\u003e : smooth and predictable. The transient response is \u003cstrong data-end=\"1871\" data-start=\"1843\"\u003elinear and unhurried\u003c\/strong\u003e , ideal for contexts where \u003cstrong data-end=\"1926\" data-start=\"1898\"\u003emusicality and naturalness\u003c\/strong\u003e are preferred to dry or rapid impacts. Particularly suitable for intimate genres and acoustic reproductions.\u003c\/p\u003e\n\u003cp data-end=\"2277\" data-start=\"2039\"\u003e\u003cstrong data-end=\"2053\" data-start=\"2039\"\u003eSoundstage\u003c\/strong\u003e : Coherent and compact. The stereo image is \u003cstrong data-end=\"2115\" data-start=\"2096\"\u003ewell focused\u003c\/strong\u003e , with \u003cstrong data-end=\"2146\" data-start=\"2121\"\u003erealistic depth\u003c\/strong\u003e and \u003cstrong data-end=\"2177\" data-start=\"2149\"\u003ecredible positioning\u003c\/strong\u003e . The soundstage tends to be \u003cstrong data-end=\"2234\" data-start=\"2217\"\u003emore contained\u003c\/strong\u003e , but rich in nuance and environmental details.\u003c\/p\u003e\n\u003cp data-end=\"2665\" data-start=\"2284\"\u003e🎧 \u003cstrong data-end=\"2344\" data-start=\"2287\"\u003eUse in Headphone Amplifiers and Driver Stages Hi-Fi\u003c\/strong\u003e \u003cbr data-end=\"2347\" data-start=\"2344\"\u003eThis 5Y4G is ideal for \u003cstrong data-end=\"2415\" data-start=\"2371\"\u003elow-current tube power supplies\u003c\/strong\u003e , especially in systems that require \u003cstrong data-end=\"2507\" data-start=\"2457\"\u003estability, silence and natural timbre\u003c\/strong\u003e . Perfect with sensitive headphones such as \u003cstrong data-end=\"2557\" data-start=\"2544\"\u003ethe Grado RS1\u003c\/strong\u003e , \u003cstrong data-end=\"2573\" data-start=\"2559\"\u003eZMF Aeolus\u003c\/strong\u003e or \u003cstrong data-end=\"2596\" data-start=\"2576\"\u003eSennheiser HD650\u003c\/strong\u003e , where it enhances microdynamics without ever going overboard in brightness.\u003c\/p\u003e\n\u003cp data-end=\"3014\" data-start=\"2667\"\u003e🎸 \u003cstrong data-end=\"2715\" data-start=\"2670\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e \u003cbr data-end=\"2718\" data-start=\"2715\"\u003eRarer in guitar circuits than other rectifiers, but ideal for \u003cstrong data-end=\"2854\" data-start=\"2802\"\u003esmall vintage combos or low-wattage custom amps\u003c\/strong\u003e , where it delivers a \u003cstrong data-end=\"2913\" data-start=\"2882\"\u003esweet, compressed, organic\u003c\/strong\u003e sound with \u003cstrong data-end=\"2944\" data-start=\"2919\"\u003enatural sag\u003c\/strong\u003e and \u003cstrong data-end=\"2973\" data-start=\"2947\"\u003emellow dynamic touch\u003c\/strong\u003e , perfect for traditional jazz and blues.\u003c\/p\u003e\n\u003cp data-end=\"3409\" data-start=\"3016\"\u003e🎯 \u003cstrong data-end=\"3051\" data-start=\"3019\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e \u003cbr data-end=\"3054\" data-start=\"3051\"\u003eA tube with \u003cstrong data-end=\"3097\" data-start=\"3072\"\u003ea calm and coherent voice\u003c\/strong\u003e , ideal for those looking for \u003cstrong data-end=\"3166\" data-start=\"3122\"\u003etransparency of timbre without fatigue\u003c\/strong\u003e and a reliable electrical base. In \u003cstrong data-end=\"3247\" data-start=\"3218\"\u003eNOS configuration with original box\u003c\/strong\u003e , it also represents a \u003cstrong data-end=\"3310\" data-start=\"3271\"\u003esmart collector's choice\u003c\/strong\u003e , especially in restorations that require authentic first-generation American components.\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\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 92 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 \u003c\/span\u003eIa = 101 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 93 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\u003c\/span\u003e \u003cmeta charset=\"utf-8\"\u003eStandard. Tested and compliant for use in hi-fi and guitar amplifiers.\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 NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\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 conditions:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Excellent – Perfectly preserved writing, minimal signs of wear. See photos. The original packaging is very compromised.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e JR -\u003cmeta charset=\"utf-8\"\u003e Code not decipherable. Year of manufacture detected by internal structure. Manufactured in the 1950s.\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":"NATIONAL UNION","offers":[{"title":"Default Title","offer_id":54041406177628,"sku":"02779M","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_087640a9-5cc5-41e6-8f8d-c21539391dd8.jpg?v=1740417967","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/5y4-g-nu-national-union-black-plates-foil-getter-rectifier-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}