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es posible un ampli sin trafo de fuente?

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Hola ale ,pensaba que ya ... los amplis valvulares trabajan con alta tension , se podria hacer un ampli rectificando los 220 de linea directamente,y ahorrar un trafo, plata, peso ,, pregunto

1)ya esta hecho? tiene alguna contra?

2)se lograrian 310 volts no?,,

3)los 220 de linea son pico a pico ? ,, si son pico a pico,, cuando se rectifica y se analiza el puente de diodos cada semiciclo corresponde a un tension pico de 110? o la tensionde linea es 440 pico a pico? o estoy razonando afuera del recipiente?

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