Description
Valvola modello 18042 fabbricazione Mullard con imballo originale. Nuova. Collaudata. (leggi sotto) Le valvole elettroniche in vendita sono sia nuove che usate, di provenienza da uno stock di un laboratorio elettronico che ha cessato l’attivita’. L’efficienza puo’ variare dal 70% al 100 % rispetto alle caratteristiche tipiche. Per controllare in maniera approfondita le caratteristiche dei tubi utilizzo un tube tester professionale di mia progettazione, che consente di impostare in maniera indipendente Vg1, Vg2 Vg3 e Vp e ricavare di conseguenza Gm (transcoductance), Ip (plate current) Rp (dynamic plate resistance), e il guadagno di tensione mu, questultimo ricavato per via indiretta a partire da gm e Rp Durante il test vengono visualizzati simultaneamente i valori di Vp (tensione di placca), Vg2 (tensione griglia schermo, G2), Vg1 (tensione di controllo, G1), IP (corrente anodica, o di placca). Il tube tester che utilizzo e’ da ritenersi a tutti gli effetti uno strumento professionale. Io sono un ingegnere elettronica con 40 anni di esperienza e specializzato nella riparazione e revisioni di strumenti Tektronix del periodo 1960-1990. Mi e’ stato più’ facile autocotsruirmelo piuttosto che acquistare un tube tester usato a prezzi assolutamente fuori mercato. Inoltre in tal modo ho potuto assemblare uno strumento che tenesse conto di tutti i vari test che intendevo realizzare sui electron tube. Ogni valvola da me collaudata e’ munita di un tagliando dove vengono dettagliate le misure effettuate e i risultati ottenuti. Legenda: VP = Anode (plate) voltage VG1 = control grid voltage VG2 = screen voltage VG3 = suppressor grid voltage (usually connected to cathode) MU = calculated transconductance (in milliSiemens) RP = plate resistance (in kOhm) MU = Voltage gain evaluated as MU = GM * RP Per I tubi doppi (doppio triodo ecc.) le due sezioni sono indicate rispettivamente dai numeri dei pin corrispondenti a una sezione. Esempio: doppio triodo E81CC, prima sezione 1-2-3, seconda sezione 6-7-8. Le tensioni di filamento sono quelle nominali. In caso di tubi contenenti due filamenti e presa centrale, essi sono da intendersi alimentati sempre in parallelo (e non in serie), salvo diversa raccomandazione del costruttore. For pentodes, the suppressor grid is ALWAYS connected to the cathode. The scree grid voltage is set accordingly the recommended values from the maker’s data sheet. Le valvole inoltre vengono sottoposte a test per verificare la presenza o meno di infiltrazioni di aria o sviluppo di gas interni (gassy tube) se la corrente anodica varia in maniera eccessiva durante il test (variazione superiore al 10%) , il tubo viene immediatamente scartato. Una valvola in buono stato dovrebbe deviare impercettibilmente la corrente anodica durate il gassy test. Le valvole vengono testate una per una e inscatolate in un nuovo box (se quello originale e danneggiato) con incluso il tagliando riportante i risultati del test. ********************************************************************Electron tube model 18042 Mullard. New and tested (read below). These electronic tubes for sale are both new and used, coming from a stock of an electronic laboratory that has ceased activity. Efficiency can vary from 70% to 100% of typical characteristics. To thoroughly check the characteristics of the tubes, I use a professional tube tester of my own design, which allows you to independently set Vg1, Vg2 Vg3 and Vp and consequently obtain Gm (transcoductance), Ip (plate current) Rp (dynamic plate resistance), and the voltage gain MU, the latter obtained indirectly starting from gm and Rp During the test, the values of Vp (plate voltage), Vg2 (screen grid voltage, G2), Vg1 (control voltage, G1), IP (anode, or plate current) are displayed simultaneously. The tube tester I use is to be considered a professional tool to all intents and purposes. I am an electrical engineer with 40 years of experience specializing in repair and recondition of 1960-1990 Tektronix instruments. It was easier for me to self-build it rather than buying a used tube tester at absolutely off-market prices. Furthermore, in this way I was able to assemble an instrument that took into account all the various tests that I intended to carry out on the electron tubes. Each valve tested by me is provided with a coupon where the measurements made and the results obtained are detailed. Legend: VP = Anode (plate) voltage VG1 = control grid voltage VG2 = screen voltage VG3 = grid voltage suppressor (usually connected to cathode) MU = calculated transconductance (in milliSiemens) RP = plate resistance (in kOhm) MU = Voltage gain evaluated as MU = GM * RP For double tubes (double triode etc.) the two sections are indicated respectively by the pin numbers corresponding to a section. Example: E81CC double triode, first section 1-2-3, second section 6-7-8. The filament voltages are the nominal ones. In the case of tubes containing two filaments with a central tap, they are always fed in parallel (and not in series), unless otherwise recommended by the manufacturer. For pentodes, the suppressor grid is ALWAYS connected to the cathode. The scree grid voltage is set accordingly the recommended values from the makers data sheet. The valves are also subjected to tests to verify the presence or absence of air infiltrations or the development of internal gases (gassy tube) if the anodic current varies excessively during the test (variation greater than 10%), the tube is immediately discarded. A valve in good condition should imperceptibly divert the anode current during the gassy test. The valves are tested one by one and boxed in a new box (if the original one is damaged) with the coupon showing the test results included.
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Aus meiner Sammlung verkaufe ich diese 4 Valvo 18042/E 83F Röhren - die Röhren sind Neu und getestet! Shipping in EU is 14€, others please ask before bidding! Privatanbieter keine Garantie oder Rücknahme
Wir haben deinradio! Senden Sie uns eine Nachricht Unser Shop Verkäuferprofil Bewertungen Shop speichern Kontakt Konvolut seltene Röhren ECL80 E280F 18042 EC86 usw. Verstärker Röhrenradio etc. Bitte entnehmen Sie den genauen Zustand und Lieferumfang den Bildern.Die Röhren wurden stichprobenweise als gut geprüft, wurden aber nicht alle durchgeschaut bzw. durchgeprüft. Wir bieten eine Vielzahl an alten Bastel -und Sammelobjekten an.Bitte beachten Sie, dass aufgrund des Alters keine Garantien auf die technischen Funktionen gegeben werden können.The parts are very old, we dont give any guarantee on the technical function. Zahlung Versand Kombiversand nur bei Artikeln möglich, die am gleichen Tag gekauft werden. (aus einer Auktionsrunde) DIe angepasste Rechnung erhalten Sie dann nach Auktionsende. Aufwendiger Versand (klimaneutral) mit DHL Premium in 2-welliger Kartonage und aufwendiger Polsterung! Versand größtenteils plastikfrei, 80 Prozent des Versandmaterial aus recyceltem Altpapier bzw. Second-Hand Kartonagen. WORLDWIDE SHIPPING ON REQUEST! PLEASE ASK BEFORE YOU BUY! Links Unser Shop Verkäuferprofil Bewertungen Shop speichern Kontakt Newsletter Verpassen Sie keine Angebote mehr! Wir informieren Sie über Angebote und Aktionen bequem per E-Mail. Newsletter abonnieren Kontakt Senden Sie uns eine Nachricht
Aus meiner Sammlung verkaufe ich diese 4 Valvo 18042/E 83F Röhren - die Röhren sind Neu und getestet! Shipping in EU is 14€, others please ask before bidding! Privatanbieter keine Garantie oder Rücknahme
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