{"product_id":"5751wa-sylvania-triple-mica-black-plates-square-getter-amplitrex-tested-tube-usa","title":"5751WA SYLVANIA Triple Mica Black Plates Square Getter Amplitrex Tested Tube USA","description":"\u003cp\u003e\u003cstrong\u003e5751WA SYLVANIA Triple Mica Black Plates Square Getter Made in USA '56\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUltra Low Noise \u0026amp; Microphonics –\u003cspan\u003e VERY STRONG - Balanced Sections - Vintage Sylvania Production\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on \u003cstrong\u003eAMPLITREX AT-1000 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -3V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1200 ; Ia = 1.0 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1200 ; Ia = 1.0 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1200 ; Ia = 1.1 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBurn-in \/ Stability Test: \u003c\/strong\u003e48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Very Low. Tested and compliant for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eNoise: \u003c\/strong\u003eLow and well-controlled. Silent operation in hi-fi and musical amplifiers in the designated positions.\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Excellent - Sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003c\/div\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003ePrecious \u003cstrong\u003e5751WA Sylvania\u003c\/strong\u003e, authentic American production \u003cstrong\u003eMade in USA from 1956\u003c\/strong\u003e, characterized by the robust and sought-after \u003cstrong\u003eTriple Mica, Black Plates, and Square Getter\u003c\/strong\u003e construction. A professional tube from the 5751 family, particularly interesting for audio applications requiring \u003cstrong\u003elow noise, stability, and excellent balance between sections\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe manufacturing code \u003cstrong\u003e620\u003c\/strong\u003e identifies production from \u003cstrong\u003eSylvania Electric Products Inc., Emporium, Pennsylvania\u003c\/strong\u003e, and places this unit in the \u003cstrong\u003e20th week of 1956\u003c\/strong\u003e. The Triple Mica construction contributes to greater mechanical rigidity of the internal structure, while the \u003cstrong\u003eBlack Plates\u003c\/strong\u003e and the \u003cstrong\u003eSquare Getter\u003c\/strong\u003e enhance its technical and collector's interest.\u003c\/p\u003e\n\u003cp\u003eThe tube has been accurately tested in our laboratory using the \u003cstrong\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e, achieving a \u003cstrong\u003eVERY STRONG \/ MOLTO FORTE\u003c\/strong\u003e classification. Both sections measure exactly \u003cstrong\u003eGm 1200\u003c\/strong\u003e, with anode currents of \u003cstrong\u003e1.0 and 1.1 mA\u003c\/strong\u003e, values perfectly consistent with the nominal reference and indicative of an \u003cstrong\u003eexcellent balance\u003c\/strong\u003e between the two triodes. Emission is very strong, stable, and free from fluctuations.\u003c\/p\u003e\n\u003cp\u003eIt has also passed a \u003cstrong\u003e48-hour Burn-in \/ Stability Test\u003c\/strong\u003e and has been selected for \u003cstrong\u003eUltra Low Noise \u0026amp; Microphonics\u003c\/strong\u003e, with low and well-controlled noise. It is therefore particularly suitable even for the \u003cstrong\u003emost sensitive audio stages\u003c\/strong\u003e, including \u003cstrong\u003eV1, compatible phono stages, and high-gain circuits\u003c\/strong\u003e, as well as for guitar amplifiers. The excellent symmetry of the two sections also makes it suitable for use as a \u003cstrong\u003ephase inverter\u003c\/strong\u003e in compatible hi-fi and instrumental applications.\u003c\/p\u003e\n\u003cp\u003eSonically, vintage \u003cstrong\u003eSylvania 5751s\u003c\/strong\u003e are appreciated for a \u003cstrong\u003ebalanced, refined, and musical\u003c\/strong\u003e presentation, with natural and well-defined mids, controlled bass, and clean, airy high frequencies. The 5751, thanks to its lower gain compared to a 12AX7\/ECC83, can offer a more controlled response and a greater sense of headroom in equipment designed to use it or that allows for its replacement.\u003c\/p\u003e\n\u003cp\u003eIdeal for \u003cstrong\u003ehi-fi preamplifiers, compatible phono stages, integrated amplifiers, line stages, phase inverters, and guitar amplifiers\u003c\/strong\u003e designed for \u003cstrong\u003e5751 \/ 5751WA\u003c\/strong\u003e or compatible with this type.\u003c\/p\u003e\n\u003cp\u003eThe tube is \u003cstrong\u003eVintage\u003c\/strong\u003e, accurately tested, and fully functional. The aesthetic conditions are \u003cstrong\u003eadequate\u003c\/strong\u003e, with partially faded markings and normal visible signs of age, while the internal structure is well preserved. It is supplied in our custom box for optimal protection.\u003c\/p\u003e\n\u003cp\u003eA valuable \u003cstrong\u003eSylvania 5751WA Triple Mica Black Plates Square Getter from 1956\u003c\/strong\u003e, truly tested and selected by \u003cstrong\u003eVacuum Tubes Treasures\u003c\/strong\u003e, with \u003cstrong\u003eVERY STRONG, excellent balance, and Ultra Low Noise \u0026amp; Microphonics selection\u003c\/strong\u003e: a particularly interesting vintage American example for high-level audio applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eConditions:\u003c\/strong\u003e Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAesthetic conditions:\u003c\/strong\u003e Adequate – Markings partially faded or barely legible, overall aesthetics with evident signs of age. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 620 → manufacturer Sylvania Electric Products Inc., Emporium, Pa. - 620 → 6 ( on three digits ) → Produced in the 20th week of 1956\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":59050469785948,"sku":"03791R","price":795.0,"currency_code":"CNY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/4_25a712c9-5c64-4c85-9a30-5484354dc52d.jpg?v=1788858632","url":"https:\/\/vacuumtubestreasures.com\/en-cn\/products\/5751wa-sylvania-triple-mica-black-plates-square-getter-amplitrex-tested-tube-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}