{"product_id":"12au7-ecc82-raytheon-matched-pair-long-black-plate-square-getter-tested-tubes-usa-59","title":"12AU7 \/ ECC82 RAYTHEON Matched Pair Long Black Plate Square Getter Tested Tubes USA '57","description":"\u003ch3\u003e\u003cstrong\u003e12AU7 \/ ECC82 RAYTHEON Matched Pair Long Black Plate Square Getter Tested Tubes USA '57\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eLow Noise \u0026amp; Microphonics –\u003cspan\u003e STRONG - Vintage American Raytheon Production\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eRisultati dei Test:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValvola testata su\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondizioni di Test:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -8.5V\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 2200 ; Ia = 10.5 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRisultato del Test:\u003c\/strong\u003e FORTE\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValvola #6:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSezione 1:\u003c\/strong\u003e Gm = 1800 ; Ia = 8.6 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSezione 2:\u003c\/strong\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e1800 ; Ia = 8.8 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValvola #5:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSezione 1:\u003c\/strong\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e2000 ; Ia = 9.6 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSezione 2:\u003c\/strong\u003e Gm = 1900 ; Ia = 9.6 mA \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTest Addizionali eseguiti:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrofonicità:\u003c\/strong\u003e Molto Bassa. Testate e conformi per l’impiego in apparecchiature hi-fi e amplificatori per chitarra, anche negli stadi audio più sensibili.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise: \u003c\/strong\u003eBasso e ben controllato. Funzionamento silenzioso in ambito hi-fi e negli amplificatori musicali nelle posizioni previste.\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBilanciamento:\u003c\/strong\u003e Eccellente - Le sezioni risultano coerenti e ben allineate, rendendo la valvola idonea anche all’impiego come phase inverter in applicazioni hi-fi e strumentali.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eQualità dell’Emissione:\u003c\/strong\u003e Forte – Emissione forte e regolare, adatta a qualsiasi applicazione.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eCortocircuiti e GAS:\u003c\/strong\u003e Assenti.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDescrizione:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003ePregiata coppia di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AU7 \/ ECC82 Raytheon di produzione americana\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, realizzata nella \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e23ª settimana del 1957\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e e caratterizzata dalla ricercata costruzione con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLong Black Plates e Square Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Il codice \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e280 57-23\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifica Raytheon Manufacturing Company e documenta con precisione sia il produttore sia il periodo di fabbricazione dei due esemplari.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLe valvole sono state abbinate sulla base del loro comportamento elettrico complessivo. La Valvola #6 presenta una transconduttanza media di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1800 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e e una corrente anodica media di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8,7 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e; la Valvola #5 raggiunge invece \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1950 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e e \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e9,6 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Le differenze rimangono entro circa il \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10%\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e su entrambi i parametri, permettendo di proporle come coppia matched per impieghi audio generali, pur senza definirle una selezione di precisione tra i due esemplari.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIl principale punto di forza è l’\u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eeccellente bilanciamento interno\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. La Valvola #6 misura \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1800\/1800 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e e \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8,6\/8,8 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, mentre la Valvola #5 raggiunge \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e2000\/1900 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e con correnti perfettamente coincidenti di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e9,6\/9,6 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Questa notevole simmetria tra le sezioni rende entrambe le valvole particolarmente interessanti anche per l’impiego come \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ephase inverter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, oltre che in preamplificatori, buffer, stadi linea e driver compatibili.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIl \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eburn-in di 48 ore\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ha confermato un funzionamento stabile e regolare, senza fluttuazioni, cortocircuiti o presenza di gas. La \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003emicrofonicità molto bassa\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e e il rumore ben controllato consentono l’utilizzo anche negli stadi audio più sensibili, tanto in apparecchiature hi-fi quanto negli amplificatori per strumenti musicali.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSul piano sonoro, le Raytheon Long Black Plates sono apprezzate per una riproduzione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edinamica, naturale e corposa\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, con gamma media ricca e ben articolata, basse frequenze solide e una parte alta definita senza risultare tagliente. Nei sistemi hi-fi favoriscono musicalità, profondità e stabilità dell’immagine; negli amplificatori per chitarra assicurano risposta pronta, controllo e un carattere autorevole.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUna proposta di notevole interesse per chi cerca una \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecoppia Raytheon americana del medesimo lotto\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, con Long Black Plates, Square Getter, sezioni interne eccezionalmente bilanciate, microfonicità molto bassa e condizioni estetiche eccellenti: due autentiche 12AU7\/ECC82 del 1957, testate individualmente e pronte all’uso.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondizioni:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondizioni:\u003c\/strong\u003e\u003cspan\u003e Valvole Vintage - Testate e perfettamente funzionanti. Fornite in nostra scatola personalizzata per una protezione ottimale.\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondizioni estetiche:\u003c\/strong\u003e Eccellenti – Scritte ottimamente conservate, minimi segni del tempo. Vedi foto per i dettagli.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCodice di Fabbricazione:\u003c\/strong\u003e 280 57-23 → 280 indica il fabbricante, ovvero Raytheon Mfg. Company, Newton 58, Mass. - 57-23 → RMA\/EIA Open Date Code → fabbricata la 23ª settimana del 1957\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\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\u003eScopra perché le nostre valvole sono diverse →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RAYTHEON","offers":[{"title":"Default Title","offer_id":59421802266972,"sku":"03871L","price":79.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_06bcdd27-c14e-414e-bcaf-ac0d12c5f1e8.jpg?v=1791563728","url":"https:\/\/vacuumtubestreasures.com\/it-ee\/products\/12au7-ecc82-raytheon-matched-pair-long-black-plate-square-getter-tested-tubes-usa-59","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}