Headphone Amplifiers

GPinto GP-H2A

L 'H2A is a headphone amplifier, built with vacuum tube technology. The circuit uses four double triodes (ECC82/12AU7): the first triode is used as a voltage amplifier, the second triode is utillizato as a phase inverter and driver of the final stage. The last two triodes are current amplifiers and work with a negative voltage grid "fixed", in securing the class dell'...