{"product_id":"12bh7a-rca-nos-nib-black-plates-foil-dimpled-getter-usa-1950s-amplitrex-tested","title":"12BH7A RCA NOS NIB Black Plates Dimpled D-Foil Getter USA 1950s AMPLITREX Tested","description":"\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12BH7A RCA NOS NIB Black Plates Dimpled D-Foil Getter – Made in USA – 1950s\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage American RCA Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eRisultati dei Test\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003eValvole testate su\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eCondizioni di Test:\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003eVa = 250V, Vg = -10.5V\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMedia 100%:\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eGm = 3.10 ; Ia = 11.5 mA\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eRisultato del Test:\u003c\/b\u003e\u003c\/span\u003e MOLTO FORTE\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eValvola:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Sezione 1:\u003c\/strong\u003e Gm = 3.70 ; Ia = 15.6 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Sezione 2:\u003c\/strong\u003e Gm = 3.30 ; Ia = \u003cmeta charset=\"utf-8\"\u003e11.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Addizionali eseguiti\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p2\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\n\u003cb\u003eMicrofonicità:\u003c\/b\u003e Bassa. 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=\"p3\"\u003e\n\u003cb\u003eBilanciamento:\u003c\/b\u003e Le sezioni non risultano perfettamente allineate. La valvola è indicata per l’uso in ambito hi-fi su stadi non critici (ingresso o driver) e negli amplificatori per chitarra. Non indicata come phase inverter o in applicazioni che richiedano un equilibrio rigoroso tra le sezioni.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\n\u003cb\u003eQualità dell’Emissione:\u003c\/b\u003e Eccellente – Emissione molto forte e stabile, senza fluttuazioni.\u003c\/li\u003e\n\u003cli class=\"p2\"\u003e\n\u003cb\u003eCortocircuiti e GAS:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e Assenti.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"p2\"\u003e\u003cb\u003eDescrizione:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePregiata \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12BH7A RCA NOS NIB\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produzione americana vintage attribuibile agli \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanni ’50\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, caratterizzata dalla ricercata costruzione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBlack Plates con Dimpled D-Foil Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, configurazione particolarmente interessante delle prime produzioni RCA della famiglia 12BH7.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLa combinazione delle classiche \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBlack Plates RCA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e con il caratteristico \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eD-Foil Getter dimpled\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e rende questo esemplare particolarmente attraente per gli appassionati della produzione americana vintage e per chi ricerca una 12BH7A d’epoca in autentiche condizioni \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS NIB – New Old Stock, New In Box\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLa valvola è stata sottoposta a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48 ore di burn-in \/ stability test\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e e successivamente accuratamente testata nel nostro laboratorio mediante \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000 Tube Tester\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, ottenendo classificazione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVERY STRONG \/ MOLTO FORTE\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Entrambe le sezioni mostrano valori di transconduttanza superiori al riferimento nominale, con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 3700 e 3300\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e rispetto a un valore 100% di 3100, confermando un’emissione particolarmente vigorosa e stabile. La valvola è risultata inoltre \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, senza cortocircuiti, gas o anomalie rilevate.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLe sezioni non presentano un bilanciamento sufficientemente rigoroso per applicazioni che richiedano una perfetta simmetria. La valvola è quindi particolarmente indicata per \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003estadi driver, line stage e altre posizioni audio non critiche\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, oltre che per amplificatori per chitarra, mentre non rappresenta la scelta ideale come \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ephase inverter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e quando sia richiesto uno stretto equilibrio tra le sezioni.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDal punto di vista sonoro, le RCA Black Plate americane di questo periodo sono apprezzate per una riproduzione ricca, autorevole e musicale, con bassi solidi e ben strutturati, una gamma media corposa e naturale e alte frequenze pulite e raffinate. Il carattere complessivo combina la tipica musicalità delle migliori produzioni RCA vintage con la dinamica e la capacità di pilotaggio proprie della 12BH7A.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLa valvola è \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS NIB – New Old Stock, New In Box\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, accuratamente testata e perfettamente funzionante, fornita nella sua \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003escatola originale RCA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Le condizioni estetiche sono buone, con serigrafie parzialmente erose ma ancora leggibili e corpo della valvola ben conservato.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUn’affascinante e non comune \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eRCA 12BH7A Black Plates Dimpled D-Foil Getter Made in USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, realmente testata e selezionata da \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVacuum Tubes Treasures\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, ideale per chi ricerca un’autentica produzione RCA americana degli anni ’50, NOS, molto forte e selezionata \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eCondizioni\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p3\"\u003e\n\u003cb\u003eCondizioni:\u003c\/b\u003e NOS - NIB - New Old Stock, New In Box - Testata e funzionante - Fornite in scatola Originale.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\n\u003cb\u003eFunzionalità:\u003c\/b\u003e Perfettamente operative.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\n\u003cb\u003eCondizioni estetiche:\u003c\/b\u003e Buone – Scritte parzialmente erose, ma ancora leggibili. Corpo della valvola in buone condizioni. Vedi foto per i dettagli.\u003c\/li\u003e\n\u003cli class=\"p2\"\u003e\n\u003cb\u003eCodice di Fabbricazione:\u003c\/b\u003e Codice non decifrabile. Produzione attribuibile indicativamente agli anni ’50 sulla base delle caratteristiche costruttive.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan class=\"s2\"\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\u003eScopra perché le nostre valvole sono diverse →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":58858486399324,"sku":"03765Y","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_86262fa0-1c44-4799-9841-8eda0797d5ad.jpg?v=1787938147","url":"https:\/\/vacuumtubestreasures.com\/it-lt\/products\/12bh7a-rca-nos-nib-black-plates-foil-dimpled-getter-usa-1950s-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}