{"product_id":"5v3-5au4-dumont-nos-nib-black-plates-double-halo-getter-amplitrex-tested-tube-rectifier-made-in-usa","title":"5V3 ( 5AU4 ) DUMONT NOS NIB Black Plates Double Halo Getter - Amplitrex Tested - Tube Rectifier Made in USA","description":"\u003cp data-start=\"146\" data-end=\"245\"\u003e\u003cstrong data-start=\"146\" data-end=\"245\"\u003e5V3 (5AU4) DUMONT NOS NIB Black Plates Double Halo Getter – Tested Tube Rectifier – Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"247\" data-end=\"806\"\u003e\u003cstrong data-start=\"247\" data-end=\"263\"\u003eDescription:\u003c\/strong\u003e\u003cbr data-start=\"263\" data-end=\"266\"\u003eThe Dumont 5V3 (5AU4) is a full-wave rectifier tube manufactured in the United States during the 1940s–1950s.\u003cbr data-start=\"375\" data-end=\"378\"\u003eAlthough branded Dumont, this specimen was actually produced by Sylvania, one of the most renowned American manufacturers of that era.\u003cbr data-start=\"512\" data-end=\"515\"\u003eIt comes in NOS NIB (New Old Stock – New in Box) condition, featuring black plates and the rare double halo getter system – a configuration that ensures robustness and long operational life.\u003cbr data-start=\"705\" data-end=\"708\"\u003eThe tube has been carefully tested on the Amplitrex AT-1000, measuring strong and fully efficient.\u003c\/p\u003e\n\u003ch3 data-start=\"813\" data-end=\"861\"\u003eTonal Characteristics and Sonic Behavior\u003c\/h3\u003e\n\u003cp data-start=\"863\" data-end=\"989\"\u003e\u003cstrong data-start=\"863\" data-end=\"872\"\u003eBass:\u003c\/strong\u003e Deep, tight, and well-controlled, with no unwanted boominess. Provides stability across the entire audio spectrum.\u003c\/p\u003e\n\u003cp data-start=\"991\" data-end=\"1105\"\u003e\u003cstrong data-start=\"991\" data-end=\"1004\"\u003eMidrange:\u003c\/strong\u003e Transparent and natural, delivering excellent timbral accuracy on vocals and acoustic instruments.\u003c\/p\u003e\n\u003cp data-start=\"1107\" data-end=\"1239\"\u003e\u003cstrong data-start=\"1107\" data-end=\"1117\"\u003eHighs:\u003c\/strong\u003e Extended and smooth, bright but free of harshness, with a natural decay that brings air and openness to the soundstage.\u003c\/p\u003e\n\u003cp data-start=\"1241\" data-end=\"1349\"\u003e\u003cstrong data-start=\"1241\" data-end=\"1254\"\u003eDynamics:\u003c\/strong\u003e Fast and coherent, capable of handling both micro-details and complex peaks with confidence.\u003c\/p\u003e\n\u003cp data-start=\"1351\" data-end=\"1476\"\u003e\u003cstrong data-start=\"1351\" data-end=\"1366\"\u003eSoundstage:\u003c\/strong\u003e Stable and three-dimensional, with good instrument separation and a clearly perceptible “black background.”\u003c\/p\u003e\n\u003ch3 data-start=\"1483\" data-end=\"1515\"\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1516\" data-end=\"1698\"\u003eAn excellent choice as a rectifier in high-end stereo amplifiers and preamplifiers.\u003cbr data-start=\"1599\" data-end=\"1602\"\u003eIts stable power delivery translates into greater detail, transparency, and musical coherence.\u003c\/p\u003e\n\u003ch3 data-start=\"1700\" data-end=\"1745\"\u003e🎸 Use in Musical Instrument Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1746\" data-end=\"1898\"\u003eAlso well-suited for vintage instrument and organ amplifiers, where it ensures reliable, quiet current delivery along with a robust and dynamic sound.\u003c\/p\u003e\n\u003ch3 data-start=\"1900\" data-end=\"1945\"\u003e🎯 Note for Audiophiles and Technicians\u003c\/h3\u003e\n\u003cp data-start=\"1946\" data-end=\"2371\"\u003eThe Dumont 5V3 (5AU4) Black Plates with double halo getter, manufactured by Sylvania, is considered one of the finest versions of this series.\u003cbr data-start=\"2088\" data-end=\"2091\"\u003eIts combination of electrical ruggedness and musical sonic performance makes it ideal both for vintage equipment restoration and for use in high-level hi-fi systems.\u003cbr data-start=\"2256\" data-end=\"2259\"\u003eThis specimen is offered as NOS NIB and Amplitrex Tested, ensuring reliable performance and long service life.\u003c\/p\u003e\n\u003chr data-start=\"2373\" data-end=\"2376\"\u003e\n\u003ch3 data-start=\"2378\" data-end=\"2399\"\u003eTest Results\u003c\/h3\u003e\n\u003cp data-start=\"2400\" data-end=\"2448\"\u003eTubes 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 Va = 278V, Vf = 5V\u003c\/li\u003e\n\u003cli\u003eForward Voltage Drop: \u003cstrong\u003e19–20 V peak (balanced sections)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eReverse Leakage: \u003cstrong\u003e397–396 V peak (excellent)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2643\" data-end=\"2663\"\u003e\u003cstrong data-start=\"2643\" data-end=\"2661\"\u003ePlate Current:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSection\u0026nbsp;1:\u003c\/strong\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa = 120 mA\u0026nbsp; \u0026nbsp;\u0026nbsp;\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eSection 2:\u003c\/strong\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa = 120 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2719\" data-end=\"2742\"\u003e\u003cstrong data-start=\"2719\" data-end=\"2740\"\u003eAdditional Tests:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMicrophony:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eStandard. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eExcellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eAbsent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2948\" data-end=\"2951\"\u003e\n\u003ch3 data-start=\"2953\" data-end=\"2971\"\u003eCondition\u003c\/h3\u003e\n\u003cul data-start=\"2972\" data-end=\"3306\"\u003e\n\u003cli data-start=\"2972\" data-end=\"3081\"\u003e\n\u003cp data-start=\"2974\" data-end=\"3081\"\u003e\u003cstrong data-start=\"2974\" data-end=\"2988\"\u003eCondition:\u003c\/strong\u003e NOS – NIB – New Old Stock, New in Box – Tested and working – Supplied in its original box.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3082\" data-end=\"3123\"\u003e\n\u003cp data-start=\"3084\" data-end=\"3123\"\u003e\u003cstrong data-start=\"3084\" data-end=\"3102\"\u003eFunctionality:\u003c\/strong\u003e Fully operational.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3124\" data-end=\"3234\"\u003e\n\u003cp data-start=\"3126\" data-end=\"3234\"\u003e\u003cstrong data-start=\"3126\" data-end=\"3149\"\u003eCosmetic Condition:\u003c\/strong\u003e Excellent – Markings well preserved, minimal signs of age. See photos for details.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3235\" data-end=\"3306\"\u003e\n\u003cp data-start=\"3237\" data-end=\"3306\"\u003e\u003cstrong data-start=\"3237\" data-end=\"3258\"\u003eManufacture Code:\u003c\/strong\u003e 312 6-31 – Produced by SYLVANIA in July 1946.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca title=\"Dyscover Why Our Tubes Are Different\" href=\"https:\/\/vacuumtubestreasures.com\/en\/blogs\/news\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different\u0026nbsp;→\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"DUMONT","offers":[{"title":"Default Title","offer_id":55334531400028,"sku":"03072U","price":9100.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_32d80627-d5af-400e-9111-54534a027220.jpg?v=1715848134","url":"https:\/\/vacuumtubestreasures.com\/en-jp\/products\/5v3-5au4-dumont-nos-nib-black-plates-oo-getter-tested-tube-rectifier-made-in-usa-en-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}