În cele ce urmează vom descrie funcţionarea si modul de realizare practică a unui număr de scheme de preamplificatoare cu tuburi şi tranzistoare. Amatorul va studia toate montajele descrise şi va trece la construcţia celui care se încadrează cel mai bine în cerinţele sale. Preamplificatoarele descrise sînt concepute ca unităţi independente. În general ele vor putea fi însă montate împreună cu amplificatorul. In ceea ce priveşte alimentarea lor, aceasta se va putea face dintr-un redresor separat sau se va putea lua de la redresorul amplificatorului sau radioreceptorului cu care respectivul preamplificator va lucra.
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