{"product_id":"12ax7-ecc83-sylvania-long-gray-plates-square-getter-tested-tube-made-in-usa","title":"12AX7 \/ ECC83 SYLVANIA Long Gray plates Square Getter Tested Tube Made in USA","description":"\u003ch3\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e12AX7 \/ ECC83 Baldwin by SYLVANIA Long Gray plates Square Getter Tested Tube \u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested – STRONG – Vintage American Sylvania Production\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 = -2V\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedia 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.2 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 :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSezione 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1400 ; Ia = 0.9 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSezione 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1500 ; Ia = \u003cmeta charset=\"utf-8\"\u003e0.9 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 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\u003cspan\u003e\u003cstrong\u003eBilanciamento:\u003c\/strong\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.\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\u003eParticolare e rara \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 Baldwin prodotta da Sylvania\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, caratterizzata dalla ricercata costruzione con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLong Gray Plates e Square Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Una configurazione tipica delle prime produzioni americane e decisamente meno comune rispetto alle successive versioni con placche corte e halo getter, interessante sia per l’impiego audio sia per il collezionista di valvole vintage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eIl codice \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e312 952\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifica \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSylvania Electric Products Inc., Emporium, Pennsylvania\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, e colloca la fabbricazione nella \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e52ª settimana del 1959\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. La marcatura Baldwin testimonia la destinazione OEM per le apparecchiature del noto costruttore americano, mentre le caratteristiche interne riconducono chiaramente alla produzione Sylvania originale.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDopo un ciclo di \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eburn-in di 48 ore\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, la valvola è stata testata con \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, registrando \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 1400 con Ia 0,9 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e per la prima sezione e \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 1500 con Ia 0,9 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e per la seconda. L’emissione risulta \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eforte, regolare e stabile\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, con valori di transconduttanza vicini al riferimento nominale.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIl \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebilanciamento molto buono\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e costituisce uno dei principali punti di forza dell’esemplare. Le correnti anodiche sono perfettamente coincidenti e la differenza di Gm è contenuta, rendendo la valvola idonea anche come \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ephase inverter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, oltre che come driver o negli stadi nei quali siano richieste coerenza e buona simmetria tra le sezioni.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLa selezione a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebassa microfonicità\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ne permette l’impiego anche negli stadi audio più sensibili di apparecchiature hi-fi e amplificatori per chitarra. Dal punto di vista sonoro, questa produzione Sylvania è apprezzata per una presentazione \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eaperta, dinamica e naturale\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, con buona definizione, risposta controllata e un equilibrio convincente lungo l’intera gamma audio.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUna \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 vintage Made in USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e particolarmente interessante per provenienza e costruzione: produzione Sylvania del 1959, marcatura Baldwin, Long Gray Plates, Square Getter e sezioni ben allineate. Testata, perfettamente funzionante e priva di cortocircuiti o gas, è pronta per tornare in servizio in apparecchiature compatibili.\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\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 Buone – Scritte ben leggibili con lievi segni del tempo. Vedi foto per i dettagli.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCodice di Fabbricazione:\u003c\/strong\u003e 312 952 → 312 indica il fabbricante, ovvero Sylvania Electric Products Inc., Emporium, Pa. - 952 → 9 ( su tre cifre ) → 1959 - 52 → 52a settimana dell'anno\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":"SYLVANIA","offers":[{"title":"Default Title","offer_id":59596906070364,"sku":"03886","price":457.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_765427c8-5bc8-4545-b8bc-4e5ca9af9fa6.jpg?v=1792490849","url":"https:\/\/vacuumtubestreasures.com\/it-dk\/products\/12ax7-ecc83-sylvania-long-gray-plates-square-getter-tested-tube-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}