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Inlocuitor 12AU7


Haralambie
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12AU7 = ECC82 si derivatele din care cele mai bune se pare ca sint 5687 si 5963 (astea au anodul mare), E182CC, 5814A, 6900, 7044, 7119...12BH7 e buna la atacul tuburilor finale, are curent anodic mai mare, ca sa o pui in locul celeilate trebuie sa faci modificari..

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Lasa asa cum e in schema, nu ai nevoie de curent mai mare anodic, acolo ai citiva mA. Poti sa pui ECC82 obisnuite. Ca sa schimbi alimentarea de la serie la paralel, modifici si alimentatorul, mai bine lasi asa cum e ptr lampa asta.Fiind o tensiune anodica mica acolo, poti sa incerci ECC88 (6DJ8) sau PCC88 (7DJ8) sau 6N23P, eventual 6N14P, cu modificarea alimentarii filamentului.

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Nu stiu ce sa zic.ECC82 nu e o lampa liniara, e mai de duzina. Iesirea nu mai este prin operational, ci printr-un buffer tranzistorizat clasa A cu intrarea pe JFET.Eu zic ca limitarea data de operational a disparut cu acest montaj. De aceea pot folosi si o lampa cu gain mai mare.

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