Mostramos en este artículo un canal de un excelente amplificador estereofónico utilizando las conocidas válvulas EL84 o 6BQ5. El circuito puede ser alimentado por diversas tensiones de entrada y tiene varias impedancias de salida dadas por el código del fabricante del circuito, ya que se trata de circuito comercial. Este circuito se encuentra en los amplificadores de la marca Geloso (Italia) que han tenido mucho éxito en las décadas de los 50 y 60. La salida en push pull proporciona algo alrededor de 10 W de salida.

El transformador de alimentación proporciona una tensión de salida de 250 V utilizando diodos en el sector de rectificación, lo que era un gran avance para la época. Además de las válvulas, los componentes críticos son los transformadores. En el caso del transformador de salida se utilizarán tipos específicos para las válvulas indicadas, pero para el transformador de fuerza se pueden realizar adaptaciones.

Vea que el transformador de fuerza tiene un secundo devanado de tensiones menor que alimenta el sector del preamplificador de modo independiente. En la figura 1 el diagrama completo del amplificador para un canal.

 

 

Figura 1 - Diagrama completo del amplificador.
Figura 1 - Diagrama completo del amplificador. | Haga click en la imagen para ampliar |

 

    

 

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