{"product_id":"5z3-vt-145-national-union-nos-nib-matched-pair-hanging-filaments-black-plates-foil-getter-usa","title":"5Z3 VT-145 NATIONAL UNION NOS NIB Matched Pair Hanging Filaments Black Plates Foil Getter USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5Z3 ( VT-145 ) NU NOS NIB Black Plates Hanging Filaments Foil Getter Engraved Base Tube Rectifiers Made in USA\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescrizione:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"781\" data-start=\"202\"\u003eLe \u003cstrong data-end=\"236\" data-start=\"205\"\u003e5Z3 (VT-145) National Union\u003c\/strong\u003e, prodotte negli Stati Uniti negli anni ’40, sono rettificatrici a doppia semionda equivalenti alla 5U4G, ampiamente utilizzate in apparecchi radio militari, trasmettitori e nei primi amplificatori audio di potenza.\u003cbr data-end=\"454\" data-start=\"451\"\u003eQuesti esemplari si presentano in condizioni \u003cstrong data-end=\"539\" data-start=\"499\"\u003eNOS NIB (New Old Stock – New in Box)\u003c\/strong\u003e e offrono dettagli costruttivi di pregio come le \u003cstrong data-end=\"605\" data-start=\"589\"\u003eplacche nere\u003c\/strong\u003e, i \u003cstrong data-end=\"650\" data-start=\"609\"\u003efilamenti sospesi (hanging filaments)\u003c\/strong\u003e, il \u003cstrong data-end=\"670\" data-start=\"655\"\u003efoil getter\u003c\/strong\u003e e la \u003cstrong data-is-only-node=\"\" data-end=\"707\" data-start=\"676\"\u003ebase incisa (engraved base)\u003c\/strong\u003e, caratteristiche distintive della produzione National Union dell’epoca.\u003c\/p\u003e\n\u003cp data-end=\"970\" data-start=\"783\"\u003eValvole di questo livello non solo rappresentano un pezzo di storia della tecnologia termoionica americana, ma sono anche apprezzatissime per la loro resa sonora raffinata e affidabile.\u003c\/p\u003e\n\u003ch3 data-end=\"1010\" data-start=\"956\"\u003eCaratteristiche timbriche e comportamento sonoro\u003c\/h3\u003e\n\u003cp data-end=\"1161\" data-start=\"1034\"\u003e\u003cstrong data-end=\"1044\" data-start=\"1034\"\u003eBassi:\u003c\/strong\u003e pieni e profondi, con ottimo controllo. Forniscono una base stabile e autorevole che dà solidità all’intera gamma.\u003c\/p\u003e\n\u003cp data-end=\"1277\" data-start=\"1164\"\u003e\u003cstrong data-end=\"1173\" data-start=\"1164\"\u003eMedi:\u003c\/strong\u003e trasparenti, ricchi e musicali. Le voci e gli strumenti acustici emergono con realismo e naturalezza.\u003c\/p\u003e\n\u003cp data-end=\"1401\" data-start=\"1280\"\u003e\u003cstrong data-end=\"1289\" data-start=\"1280\"\u003eAlti:\u003c\/strong\u003e estesi e fluidi, con brillantezza equilibrata e mai affaticante. Offrono ariosità e dettaglio senza asprezze.\u003c\/p\u003e\n\u003cp data-end=\"1512\" data-start=\"1404\"\u003e\u003cstrong data-end=\"1417\" data-start=\"1404\"\u003eDinamica:\u003c\/strong\u003e pronta e incisiva, con capacità di seguire sia i transienti rapidi che i passaggi complessi.\u003c\/p\u003e\n\u003cp data-end=\"1616\" data-start=\"1515\"\u003e\u003cstrong data-end=\"1530\" data-start=\"1515\"\u003eSoundstage:\u003c\/strong\u003e ampio e tridimensionale, con separazione netta degli strumenti e ottima profondità.\u003c\/p\u003e\n\u003ch3 data-end=\"2004\" data-start=\"1971\"\u003e🎧 Uso in amplificatori Hi-Fi\u003c\/h3\u003e\n\u003cp data-end=\"2283\" data-start=\"2006\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003ePerfette per amplificatori valvolari vintage di potenza e preamplificatori hi-fi, dove garantiscono alimentazione stabile e un impatto sonoro elegante e raffinato.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-end=\"2340\" data-start=\"2290\"\u003e🎸 Uso in amplificatori per strumenti musicali\u003c\/h3\u003e\n\u003cp data-end=\"2639\" data-start=\"2342\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003eIdeali per organi e amplificatori storici, forniscono una corrente affidabile e un suono ricco, robusto e musicale, con un carattere caldo e autentico.\u003cbr\u003e\u003c\/p\u003e\n\u003ch3 data-end=\"2681\" data-start=\"2646\"\u003e🎯 Nota per audiofili e tecnici\u003c\/h3\u003e\n\u003cp data-end=\"3065\" data-start=\"2683\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003eLe \u003cstrong data-end=\"2111\" data-start=\"2067\"\u003e5Z3 (VT-145) National Union Black Plates\u003c\/strong\u003e con \u003cstrong data-end=\"2164\" data-start=\"2116\"\u003efilamenti sospesi, foil getter e base incisa\u003c\/strong\u003e rappresentano alcune delle versioni più affascinanti e ricercate di questa rettificatrice storica.\u003cbr data-end=\"2266\" data-start=\"2263\"\u003eUn’opzione perfetta per chi cerca \u003cstrong data-end=\"2361\" data-start=\"2300\"\u003eaffidabilità tecnica, musicalità e valore collezionistico\u003c\/strong\u003e, adatta sia a restauri filologici che a impianti hi-fi di fascia alta.\u003cbr\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eRisultati dei Test:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eValvole testate su \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eVoltage Test:\u003c\/strong\u003e Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBuone da: Ia = 78 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMedia 100% Ia = 120 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eRisultato del Test: MOLTO FORTE\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCorrente di placca\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValvola 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSezione 1:\u003c\/strong\u003e Ia = 102 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSezione 2:\u003c\/strong\u003e Ia = 102 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValvola 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSezione 1:\u003c\/strong\u003e Ia = 105 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSezione 2:\u003c\/strong\u003e Ia = 110 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eCorrente di placca:\u003c\/span\u003e \u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Addizionali\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunzionamento:\u003c\/strong\u003e Valvola stabile, silenziosa in esercizio e idonea a un’alimentazione regolare e controllata. Test eseguito con tester Funke W19.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQualità dell’Emissione:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eEccellente – Emissione molto forte e stabile, senza fluttuazioni.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCortocircuiti e GAS: \u003c\/strong\u003eAssenti.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondizioni:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondizioni:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eNOS - NIB - New Old Stock, New In Box - Testata e funzionante - Fornite in scatola Originale.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunzionalità: \u003c\/strong\u003ePerfettamente operativa.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondizioni estetiche:\u003c\/strong\u003e\u003cspan\u003e Eccellenti – Scritte ottimamente conservate, minimi segni del tempo. Vedi foto per i dettagli.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCodice di Fabbricazione:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eAssente - Anno di fabbricazione ricavato dalla struttura interna - Fabbricata negli anni '40\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eScopra perché le nostre valvole sono diverse →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"NATIONAL UNION","offers":[{"title":"Default Title","offer_id":55337679815004,"sku":"03074","price":141.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_efac137b-78da-4b72-b0fd-5b4b02ff0fbc.jpg?v=1756314752","url":"https:\/\/vacuumtubestreasures.com\/it-gb\/products\/5z3-vt-145-national-union-nos-nib-matched-pair-hanging-filaments-black-plates-foil-getter-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}