{"product_id":"5u4-g-u52-philco-black-plates-square-getter-tube-rectifier-made-in-usa-55","title":"5U4G U52 Philco by Sylvania – Black Plates Square Getter Rectifier Tube USA 1955","description":"\u003cp\u003e\u003cstrong\u003e5U4 G ( U52 ) PHILCO Black Plates Square Getter Tube Rectifier Made in USA '55\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"32\" data-end=\"473\"\u003eThe \u003cstrong data-start=\"74\" data-end=\"82\"\u003e1955\u003c\/strong\u003e \u003cstrong data-start=\"35\" data-end=\"69\"\u003ePHILCO Black Plates 5U4G (U52)\u003c\/strong\u003e , with \u003cstrong data-start=\"88\" data-end=\"105\"\u003eSquare Getter\u003c\/strong\u003e , is a high quality rectifier tube, built to provide \u003cstrong data-start=\"181\" data-end=\"220\"\u003estable and reliable rectification\u003c\/strong\u003e . Although it does not directly affect the timbre like a signal tube, its ability to provide a \u003cstrong data-start=\"338\" data-end=\"378\"\u003ewell-regulated, fluctuation-free\u003c\/strong\u003e voltage affects the \u003cstrong data-start=\"395\" data-end=\"470\"\u003edynamics, smoothness and overall transparency of the audio system\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cul data-start=\"475\" data-end=\"1133\"\u003e\n\u003cli data-start=\"475\" data-end=\"634\"\u003e\u003cstrong data-start=\"477\" data-end=\"486\"\u003eBass\u003c\/strong\u003e : \u003cstrong data-start=\"488\" data-end=\"518\"\u003eWell controlled and defined\u003c\/strong\u003e , with excellent articulation that ensures clean reproduction, without excessive emphasis or loss of detail.\u003c\/li\u003e\n\u003cli data-start=\"635\" data-end=\"784\"\u003e\u003cstrong data-start=\"637\" data-end=\"645\"\u003eMids\u003c\/strong\u003e : \u003cstrong data-start=\"647\" data-end=\"676\"\u003eBalanced and transparent\u003c\/strong\u003e , with a clear and natural performance, maintaining tonal coherence and excellent separation of instruments.\u003c\/li\u003e\n\u003cli data-start=\"785\" data-end=\"922\"\u003e\u003cstrong data-start=\"787\" data-end=\"795\"\u003eHighs\u003c\/strong\u003e : \u003cstrong data-start=\"797\" data-end=\"821\"\u003eAiry and detailed\u003c\/strong\u003e , free from harshness, with an excellent ability to preserve detail without being fatiguing.\u003c\/li\u003e\n\u003cli data-start=\"923\" data-end=\"1133\"\u003e\u003cstrong data-start=\"925\" data-end=\"937\"\u003eDynamics\u003c\/strong\u003e : \u003cstrong data-start=\"939\" data-end=\"960\"\u003eFluid and natural\u003c\/strong\u003e , with precise transient management that improves the depth and reactivity of the amplifier, favoring a \u003cstrong data-start=\"1099\" data-end=\"1130\"\u003eharmonious and well-structured\u003c\/strong\u003e sound reproduction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1135\" data-end=\"1504\"\u003eThe \u003cstrong data-start=\"1138\" data-end=\"1161\"\u003ePHILCO Black Plates\u003c\/strong\u003e from the 50s are distinguished by their \u003cstrong data-start=\"1204\" data-end=\"1264\"\u003erobust construction and clean, stable rectification\u003c\/strong\u003e , making them ideal for \u003cstrong data-start=\"1288\" data-end=\"1335\"\u003ehi-fi amplifiers and vintage audio systems\u003c\/strong\u003e , where a \u003cstrong data-start=\"1355\" data-end=\"1382\"\u003econstant, well-regulated\u003c\/strong\u003e voltage helps to achieve a \u003cstrong data-start=\"1411\" data-end=\"1449\"\u003enatural and detailed sound reproduction\u003c\/strong\u003e , with a \u003cstrong data-start=\"1480\" data-end=\"1501\"\u003esmooth and musical\u003c\/strong\u003e sonic presentation.\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 = 120 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 = 135 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 120 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\u003cstrong\u003eOperation:\u003c\/strong\u003e Stable tube, silent in operation and suitable for providing a regular and well-controlled power supply. Tested with Funke W19 tube tester.\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 Valves - 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 Condition:\u003c\/strong\u003e Very Good – Clearly legible writing with slight signs of erosion, no obvious defects. See photos.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 5543 - produced 43rd week of 1955\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":"PHILCO","offers":[{"title":"Default Title","offer_id":54040063770972,"sku":"02775Y","price":5400.0,"currency_code":"ALL","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_f4b9ad40-fabf-4c8f-85c4-6aa1746c8bd0.jpg?v=1740400478","url":"https:\/\/vacuumtubestreasures.com\/en-al\/products\/5u4-g-u52-philco-black-plates-square-getter-tube-rectifier-made-in-usa-55","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}