{"product_id":"6sn7gta-nos-sylvania-chrome-top-matched-sextet-same-production-code-low-noise-microphonics-amplitrex-tested","title":"6SN7GTA NOS SYLVANIA Chrome Top Matched Sextet - Same Production Code - Low Noise \u0026 Microphonics - AMPLITREX Tested","description":"\u003ch3 data-pm-slice=\"1 3 []\"\u003e\u003cstrong\u003e\u003cspan\u003e6SN7GTA NOS SYLVANIA – Short Base Chrome Top – Black Plates – Matched Sextet – Made in USA 1955\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAMPLITREX Tested – VERY STRONG – Matched Sextet – Low Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan\u003eRisultati dei Test:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eValvole testate su \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000 Tube Tester\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCondizioni di Test:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Va = 250V; Vg = -8V\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMedia 100%:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 9.0 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRisultato del Test:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e MOLTO FORTE\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRange del sestetto sulle medie delle valvole:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600–2600; Ia = 7.6–7.8 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMatched Score:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.60 – Abbinamento eccellente\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValvola #6\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 1:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.6 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 2:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.6 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValvola #37\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 1:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.8 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 2:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.4 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValvola #35\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 1:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.6 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 2:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.8 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValvola #4\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 1:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2500; Ia = 7.4 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 2:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2700; Ia = 8.0 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValvola #7\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 1:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.6 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 2:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 8.0 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eValvola #8\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 1:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 7.6 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSezione 2:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Gm = 2600; Ia = 8.0 mA\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eTest addizionali:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBurn-in \/ Stability Test:\u003c\/b\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eMicrofonicità e rumore:\u003c\/b\u003e\u003c\/span\u003e Molto Bassi. Testate e conformi per l’impiego in apparecchiature hi-fi e amplificatori per chitarra, anche negli stadi audio più sensibili.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBilanciamento:\u003c\/b\u003e\u003c\/span\u003e Molto buono. Le sezioni risultano coerenti e ben allineate, rendendo la valvola idonea anche all’impiego come phase inverter in applicazioni hi-fi e strumentali.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eEmissione:\u003c\/b\u003e\u003c\/span\u003e Eccellente – Emissione molto forte e stabile, senza fluttuazioni.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cb\u003eCortocircuiti \/ Gas:\u003c\/b\u003e\u003cspan class=\"s1\"\u003e assenti\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eDescrizione\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eEccezionale \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esestetto NOS di 6SN7GTA Sylvania\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, prodotto negli Stati Uniti nel 1955 e accuratamente selezionato come \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMatched Sextet\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Tutti e sei gli esemplari presentano la prestigiosa costruzione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShort Base Chrome Top\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eplacche nere e getter superiore\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, una delle configurazioni più ricercate della produzione americana Sylvania degli anni ’50.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLe misurazioni eseguite con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e confermano un abbinamento elettrico di livello eccezionale. Le medie delle sei valvole risultano perfettamente uniformi nella transconduttanza, con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm = 2600 per ogni esemplare\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, mentre la corrente anodica media è racchiusa nell’intervallo estremamente ristretto di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e7,6–7,8 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Il \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMatched Score di 2,60\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e conferma l’eccellente coerenza complessiva del sestetto.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAnche le singole sezioni mostrano valori solidi e ben allineati: la transconduttanza è compresa tra \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 2500 e 2700\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, mentre la corrente anodica varia tra \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e7,4 e 8,0 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Questi risultati rendono il gruppo particolarmente indicato per apparecchiature che richiedono sei 6SN7 dalle prestazioni omogenee e prevedibili.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOgni valvola è stata sottoposta a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48 ore di burn-in e verifica della stabilità\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, oltre a controlli specifici per rumore e microfonicità. La selezione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGreen Dot e Gray Dot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifica esemplari caratterizzati da \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003erumore e microfonicità molto bassi\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, adatti anche agli stadi audio più sensibili.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGrazie all’eccellente abbinamento, questo sestetto rappresenta una scelta ideale per \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003epreamplificatori multicanale, amplificatori per cuffie, circuiti bilanciati, stadi driver, buffer e phase inverter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, oltre che per elettroniche hi-fi di alto livello nelle quali uniformità, silenziosità e stabilità sono requisiti fondamentali.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eQueste 6SN7GTA conservano le qualità tradizionalmente associate alla migliore produzione Sylvania: una riproduzione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eaperta, dinamica e naturale\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, accompagnata da eccellente trasparenza, definizione e controllo.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUn \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eraro Matched Sextet NOS\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, risalente alla \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e13ª settimana del 1955\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, destinato agli appassionati più esigenti e ai collezionisti alla ricerca di autentiche valvole Sylvania americane, accuratamente testate e selezionate.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 class=\"p1\"\u003e\u003cstrong\u003eCondizioni\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eCondizioni:\u003c\/b\u003e\u003c\/span\u003e NOS - New Old Stock - Testata e funzionante - Fornite in nostra scatola personalizzata per una protezione ottimale.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eFunzionalità:\u003c\/b\u003e\u003c\/span\u003e Perfettamente operativa\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eCondizioni estetiche:\u003c\/b\u003e\u003c\/span\u003e Eccellenti – Scritte ottimamente conservate, minimi segni del tempo. Vedi foto per i dettagli.\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eSelezione \u003c\/strong\u003e\u003cspan\u003e\u003cstrong\u003especiale:\u003c\/strong\u003e \u003c\/span\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/strong\u003e\u003cspan\u003eGreen \u003c\/span\u003e\u003cspan\u003eDot \u003c\/span\u003e\u003cspan\u003ee \u003c\/span\u003e\u003cspan\u003eGray \u003c\/span\u003e\u003cspan\u003eDot, \u003c\/span\u003e\u003cspan\u003econ \u003c\/span\u003e\u003cspan\u003ebasso \u003c\/span\u003e\u003cspan\u003erumore \u003c\/span\u003e\u003cspan\u003ee \u003c\/span\u003e\u003cspan\u003emicrofonicità \u003c\/span\u003e\u003cspan\u003everificati \u003c\/span\u003e\u003cspan\u003emediante \u003c\/span\u003e\u003cspan\u003eAmplitrex \u003c\/span\u003e\u003cspan\u003eAT-1000.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCodice di fabbricazione:\u003c\/strong\u003e Sylvania Electric Products Inc., USA – marcatura originale sulla base 288 \/ 513. 288 codice Sylvania Interno. 513 - 13ª settimana del 1955 (marzo 1955).\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":"SYLVANIA","offers":[{"title":"Default Title","offer_id":59659409916252,"sku":"03901","price":519.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_0bf4a4cf-7267-49de-b155-9205d7f7b762.jpg?v=1793112520","url":"https:\/\/vacuumtubestreasures.com\/it-bg\/products\/6sn7gta-nos-sylvania-chrome-top-matched-sextet-same-production-code-low-noise-microphonics-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}