{"product_id":"6v6gt-rca-black-plates-smoked-glass-dd-getter-closely-tested-pair-tubes-usa-1950s","title":"6V6GT RCA Black Plates Smoked Glass DD Getter Closely Tested Pair Tubes USA 1950s","description":"\u003ch3\u003e\u003cstrong\u003e6V6GT RCA Black Plates Smoked Glass DD Bottom Getter - Closely  Tested Pair Tubes - Made in USA 1950s\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eAMPLITREX Tested –\u003cspan\u003e STRONG - Vintage American RCA 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 \u003cstrong\u003eAMPLITREX AT-1000 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondizioni di Test:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eVa = 250V; Vg2 = 250V; Vg = -12.5V \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia 100%:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eGm = 4.1 ; Ia = 45 mA\u003c\/span\u003e\n\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\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eValvola 1:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGm = 4.29 ; Ia = 40.8 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eValvola 2:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGm = 4.14 ; Ia = 34.6 mA\u003c\/span\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eTest Addizionali eseguiti:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrofonicità:\u003c\/strong\u003e Bassa. Testate e conformi per l’impiego in apparecchiature hi-fi e amplificatori per chitarra.\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\u003e\u003cspan\u003eCoppia selezionata di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6V6GT RCA Made in USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, appartenente alla prestigiosa produzione americana degli \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eanni Cinquanta\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Entrambe presentano la ricercata costruzione con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eplacche nere, vetro fumé e doppio D getter inferiore\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, caratteristiche particolarmente apprezzate dagli estimatori delle prime 6V6GT RCA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUna valvola riporta il codice \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5-43\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, che colloca la fabbricazione nella \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e43ª settimana del 1955\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Il codice \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eYJL\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e presente sull’altra non è decifrabile con certezza, ma la configurazione costruttiva ne conferma l’appartenenza alla produzione RCA dello stesso periodo storico.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLe valvole sono state accuratamente verificate su \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. La Valvola 1 ha registrato \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 4,29 mA\/V e Ia 40,8 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, mentre la Valvola 2 misura \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 4,14 mA\/V e Ia 34,6 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. La transconduttanza risulta estremamente vicina, con uno scarto inferiore al \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4%\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, ed entrambe le unità raggiungono o superano il valore nominale di riferimento.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLa corrente anodica presenta invece una differenza più marcata, pari a circa il \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e16%\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. La coppia è quindi strettamente abbinata per transconduttanza, ma non deve essere considerata un \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eprecision current matched pair\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e. È particolarmente indicata per amplificatori con regolazione individuale del bias e per applicazioni nelle quali non sia richiesta un’assoluta coincidenza della corrente di riposo.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEntrambe le valvole hanno mostrato \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eemissione forte e regolare\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, bassa microfonicità e assenza di gas o cortocircuiti. Sono adatte a stadi finali hi-fi, amplificatori per chitarra e apparecchiature vintage compatibili con la 6V6GT.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSul piano sonoro, le RCA black plate degli anni Cinquanta sono generalmente apprezzate per una presentazione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecorposa, musicale e naturale\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, con gamma media ricca, basse frequenze autorevoli e alte frequenze ben definite senza risultare aggressive.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSi tratta di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003evalvole vintage usate, testate e perfettamente funzionanti\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, con scritte ottimamente conservate e condizioni estetiche eccellenti. Fornite nelle scatole personalizzate Vacuum Tubes Treasures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUna coppia RCA anni Cinquanta di grande fascino, selezionata per \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003etransconduttanza strettamente abbinata, autentica costruzione black plate e caratteristico doppio D bottom getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\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\u003eStato:\u003c\/strong\u003e Valvole Vintage - Testate e perfettamente funzionanti. Fornite in nostra scatola personalizzata per una protezione ottimale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunzionalità:\u003c\/strong\u003e Perfettamente operative.\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 \u003cmeta charset=\"utf-8\"\u003efabbricate da \u003cmeta charset=\"utf-8\"\u003eRadio Corporation of America, Camden, N. J. - una valvola 5-43 → RMA\/EIA Open Date Code → fabbricata la 43ª settimana del 1955 - una valvola YJL → codice non decifrabile. Produzione attribuibile agli anni ’50 sulla base delle caratteristiche costruttive.\u003c\/li\u003e\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\u003eScopra perché le nostre valvole sono diverse →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":59247136244060,"sku":"03836T","price":929.0,"currency_code":"CNY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_6c4ab5ba-0c21-4885-aa38-3d4520e50f5c.jpg?v=1790153151","url":"https:\/\/vacuumtubestreasures.com\/it-cn\/products\/6v6gt-rca-black-plates-smoked-glass-dd-getter-closely-tested-pair-tubes-usa-1950s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}